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Contents Wiring diagrams Section: Exterior Lights All sections

Lighting System - Diagnostic Information and Procedures Buick Encore I

Exterior Lights ~36801 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Courtesy Lamps Control - Terminal 2 X7B1480 0211
Dome Lamps Control - Terminal 1 X7B2615 0222
Dome/Reading Lamps - Front Ground1, 2
Dome Lamp - Rear Ground1, 2
Sunshade - Left Ground1
Sunshade - Right Ground1
1. Courtesy Lamps Malfunction 2. Dome Lamps Malfunction

Circuit/System Description

The body control module (BCM) supplies battery voltage to the reading lamps and sunshade mirror lamps via the courtesy lamp control circuit. The front reading lamps are controlled by an individual switch that is activated by the operator when additional cabin lighting is required. In the event that the reading lamps or sunshade lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the courtesy lamps control circuit terminal 2 X7.

Actions Taken When the DTC Sets

The BCM will disable the circuit and the reading/sunshade lamps will be inoperative.

Conditions for Clearing the DTC

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

  1. «Interior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Interior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connectors at the components listed below. E37A Dome/Reading Lamps E36AH Dome Lamp A3L Sunshade - Left A3R Sunshade - Right
  2. Connect a test lamp between the appropriate control circuit terminal listed below and ground. E37A Dome/Reading Lamps - terminal 1 E36AH Dome Lamp - terminal 4 A3L Sunshade - Left terminal A A3R Sunshade - Right terminal A
  3. Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  4. Test or replace the inoperative courtesy lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Dome Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Center Reading Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Center Reading Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Fog Lamp and Instrument Panel Dimmer Switch B+B257B 03, B1405 03B257B 03
Front Fog Lamp and Instrument Panel Dimmer Switch SignalB257B 03B257B 031
Front Fog Lamp Relay ControlB2530 02, B2530 04B2530 02, B2530 04B2530 01
Front Fog Lamp Control111
Front Fog Lamp Ground - Left1
Front Fog Lamp Ground - Right1
1. Front Fog Lamps Malfunction

The front fog lamp switch is an input to the body control module (BCM) and is contained in the headlamp switch assembly. The BCM supplies voltage to the front fog lamp switch via the front fog lamp and instrument panel dimmer switch B+ circuit. When the front fog lamp switch is pressed, voltage from the B+ circuit is pulled down through the front fog lamp switch resistor. The front fog lamp resistor is part of the resistor ladder that also provides the dimming signals for the instrument panel dimmer switches. The BCM receives the voltage signal through the front fog lamp and instrument panel dimmer switch signal circuit.

The front fog lamp relay is supplied with battery voltage at all times. The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The body control module (BCM) energizes the front fog lamp relay by applying ground to the front fog lamp relay control circuit. When the front fog lamp relay is energized, the relay switch contacts close and battery voltage is applied through the front fog lamp fuse to the front fog lamp control circuit which illuminates the front fog lamps.

  1. Battery voltage must be between 9-16 V.
  2. Front fog lamps ON.

DTC B2530 01

The BCM detects a short to voltage in the front fog lamp relay control circuit for 5 seconds or greater.

DTC B2530 02

The BCM detects a short to ground in the front fog lamp relay control circuit.

DTC B2530 04

The BCM detects an open in the front fog lamp relay control circuit.

DTC B2530 01 and B2530 04

The front fog lamps will not operate when the park lamps are ON and the front fog lamp switch is active.

DTC B2530 02

The front fog lamps always ON.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the control circuit terminal 13 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  3. Ignition OFF, connect a 3 A fused jumper between the control circuit terminal 13 and ground.
  4. Remove the front fog lamp fuse at the X50A Fuse Block - Underhood, ignition ON.
  5. Verify a test lamp illuminates between the front fog lamp fuse B+ switch control terminal and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal 13 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  6. Test or replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Front Compartment Fuse Block Replacement»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Backup Lamp Switch Signal (Manual Transmission)P0812P08121
Backup Lamps ControlB2545 02B2545 04B2545 01
Backup Lamp Switch Ground (Manual Transmission)P0812
Backup Lamp Ground - Left1
Backup Lamp Ground - Right1
1. Backup Lamps Malfunction

Automatic Transmission

With the engine running and the transmission in the reverse position, the transmission control module (TCM) sends a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamps control circuit illuminating the backup lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove battery voltage from the backup lamps control circuit. The engine must be running for the backup lamps to operate.

Manual Transmission

The engine control module (ECM) provides a signal circuit to the backup lamp switch which is permanently grounded. With the ignition ON and the transmission in the reverse position, the backup lamp switch signal circuit is pulled low and the ECM responds by sending a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamps control circuit illuminating the backup lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the ECM via serial data requesting the BCM to remove battery voltage from the backup lamps control circuit.

  1. Battery voltage must be between 9-16 V.
  2. Engine RUNNING.
  3. Transmission placed in REVERSE gear.

DTC B2545 01

The BCM detects a short to voltage in the backup lamps control circuit.

DTC B2545 02

The BCM detects a short to ground in the backup lamps control circuit.

DTC B2545 04

The BCM detects an open/high resistance in the backup lamps control circuit.

DTC B2545 02 and B2545 04

The backup lamps will not operate.

DTC B2545 01

The backup lamps are always ON.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the appropriate E5 Backup Lamp bulb at the appropriate E42 Tail Lamp Assembly.
  2. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E5 Backup Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Backup Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Backup Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F2DA (BCM 2) Fuse B+11
Rear Compartment Courtesy Lamp ControlB2570 0211
Rear Compartment Courtesy Lamp Ground1
1. Rear Compartment Lamp Malfunction

The body control module (BCM) applies battery voltage to the rear compartment courtesy lamp through the rear compartment lamp control circuit. When the BCM receives a rear compartment lid open input from the rear compartment lid latch, the BCM applies battery voltage to the rear compartment lamp control circuit illuminating the rear compartment courtesy lamp. In the event that the rear compartment lamp were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the rear compartment lamp control circuit to prevent total battery discharge.

  1. Battery voltage must be between 9-16 V.
  2. Rear compartment OPEN.

The BCM detects a short to ground on the rear compartment courtesy lamp control circuit.

The rear compartment lamp is inoperative.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the harness connector at the E8S Rear Compartment Courtesy Lamp.
  2. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Cargo Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the E8S Rear Compartment Courtesy Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Cargo Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Cargo Center Courtesy Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F3DA (BCM 3) Fuse B+B2699 01, B2699 04B2699 01, B2699 04
F4DA (BCM 4) Fuse B+B2575 01, B2575 04B2575 01, B2575 04
Low Beam Headlamp Control - Left (TR6)B2575 02B2575 04B2575 01, B2575 04
Low Beam Headlamp Control - Right (TR6)B2699 02B2699 04B2699 01, B2699 04
Headlamp Ground - Left (TR6)1
Headlamp Ground - Right (TR6)1
1. Headlamps Malfunction

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. The body control module (BCM) responds by applying battery positive voltage to the left and right low beam headlamp control circuits illuminating the low beam headlamps.

  1. Battery voltage must be between 9-16 V.
  2. Low beam headlamps ON.

DTC B2575 01 and B2575 04

  1. The BCM detects a short to voltage or an open/high resistance in the left low beam headlamp control circuit.
  2. The BCM detects a short to ground or an open/high resistance in the F4DA (BCM 4) fuse B+ circuit.

DTC B2575 02

The BCM detects a short to ground in the left low beam headlamp control circuit.

DTC B2699 01 and B2699 04

  1. The BCM detects a short to voltage or an open/high resistance in the right low beam headlamp control circuit.
  2. The BCM detects a short to ground or an open/high resistance in the F3DA (BCM 3) fuse B+ circuit.

DTC B2699 02

The BCM detects a short to ground in the right low beam headlamp control circuit.

  1. When DTC B2575 sets, the left low beam headlamp will be inoperative.
  2. When DTC B2699 sets, the right low beam headlamp will be inoperative.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

  1. «Headlights/Daytime Running Lights (DRL) Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Headlights/Daytime Running Lights (DRL) Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC B2575

  1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X1 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the E13L Headlamp - Left.
  5. Test for less than 5 ohms between the ground circuit terminal C and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the control circuit terminal A and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the Left Low Beam/Daytime Running Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the E13L Headlamp Bulb - Left.

DTC B2699

  1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X1 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the E13R Headlamp - Right.
  5. Test for less than 5 ohms between the ground circuit terminal C and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the control circuit terminal A and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the Right Low Beam/Daytime Running Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the E13R Headlamp Bulb - Right.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Bulb Replacement - Left Side (Trax High Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Bulb Replacement - Left Side (Trax Low Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Headlamp Bulb Replacement - Right Side (High Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Bulb Replacement - Right Side (Low Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch Park Lamps ON Signal2B257A 002
Headlamp Switch Headlamps OFF SignalB257A 0011
Headlamp Switch Headlamps ON SignalB257A 0011
Headlamp Switch Ground1
1. Headlamps Malfunction 2. Park, License, and/or Tail Lamps Malfunction

For headlamp operation, the body control module (BCM) monitors three signal circuits from the headlamp switch. When the headlamp switch is in the AUTO position, the three signal circuits are unaffected and the BCM relies on the ambient light sensor input to turn the headlamps and daytime running lamps ON and OFF. When the headlamp switch is placed in the OFF position, the headlamp switch headlamps OFF signal circuit is grounded, indicating to the BCM that the exterior lamps should be turned OFF. With the headlamp switch in the PARK LAMPS position, the headlamp switch park lamps ON signal circuit is grounded, indicating that the park lamps have been requested. When the headlamp switch is in the HEADLAMP position, both the headlamp switch park lamps ON signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The BCM responds by commanding the park lamps and headlamps ON.

Battery voltage must be between 9-16 V.

  1. The BCM detects an open/high resistance in the headlamp switch park lamps ON signal circuit.
  2. The BCM detects a short to ground in the headlamp switch headlamps ON signal circuit.
  3. The BCM detects a short to ground in the headlamp switch headlamps OFF signal circuit.
  1. When DTC B257A 00 is present on the headlamp switch headlamps OFF signal circuit, the low beam headlamps are always ON in the AUTO position. The headlamp switch operates in all positions other than AUTO. The AUTO headlamp defeat is inoperative.
  2. When DTC B257A 00 is present on the headlamp switch headlamps ON signal circuit, the low beam headlamps are always ON. The BCM disregards all headlamp switch inputs.
  3. When DTC B257A 00 is present on the headlamp switch park lamps ON signal circuit, the park lamps and low beam headlamps are inoperative in the PARK and HEAD positions. Headlamps and park lamps operate in AUTO position.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 6 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Automatic Headlamps Disable Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6.
  6. Verify the scan tool Automatic Headlamps Disable Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 5 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Verify the scan tool Park Lamps Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  8. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 6.
  9. Verify the scan tool Park Lamps Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  10. Verify the scan tool Headlamps On Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  11. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 6.
  12. Verify the scan tool Headlamps On Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  13. Test or replace the S30 Headlamp Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Instrument Panel Dimmer Switch B+ ReferenceB257B 03, B1405 03B257B 03
Instrument Panel Dimmer Switch SignalB257B 03B257B 03B257B 07
LED Backlight Dimming Control Terminal 8 X2B2610 02B2610 04B2610 01
LED Backlight Dimming Control Terminal 5 X1B252E 02B252E 021
Hazard Warning Switch LED Backlight Dimming Control111
Transmission Shift Lever Position Indicator Backlight ControlB2652 0211
1. Interior Backlighting Malfunction

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference signal and a B+ voltage reference to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the light emitting diode (LED) dimming control circuits illuminating the interior backlighting to the requested level of brightness.

  1. Battery voltage must be between 9-16 V.
  2. Park lamps ON.

DTC B257B 03

  1. The BCM detects a short to ground or an open/high resistance in the instrument panel dimmer switch B+ circuit.
  2. The BCM detects a short to ground or an open/high resistance in the instrument panel dimmer switch signal circuit.

DTC B257B 07

The BCM detects a short to voltage in the instrument panel dimmer switch signal circuit.

The BCM will not dim any interior backlighting. All interior backlighting will default to the level selected prior to the fault being present.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S30 Headlamp Switch, ignition ON.
  2. Test for B+ between the B+ circuit terminal 1 and ground. If less than B+ Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If B+
  3. Verify a test lamp does not illuminate between the B+ circuit terminal 1 and the signal circuit terminal 12. If the test lamp illuminates Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp does not illuminate
  4. Test for B+ between the B+ circuit terminal 1 and the signal circuit terminal 12. If less than B+ Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 12 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If B+
  5. Test or replace the S30 Headlamp Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F3DA (BCM 3) Fuse B+B2699 01, B2699 04B2699 01, B2699 04
F4DA (BCM 4) Fuse B+B2575 01, B2575 04B2575 01, B2575 04
Headlamp High Beam Relay ControlB2580 02, B2580 04B2580 02, B2580 04B2580 01
High Beam Headlamp Control - Left111
High Beam Headlamp Control - Right111
Headlamp Ground - Left1
Headlamp Ground - Right1
1. Headlamps Malfunction

The high beam and flash to pass functions are contained within the turn signal/multifunction switch. The BCM provides the turn signal/multifunction switch with two signal circuits, the high beam signal circuit and the flash to pass signal circuit. When the low beam headlamps are ON and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the BCM through the high beam signal circuit. The BCM responds to the high beam request by applying ground to the high beam relay control circuit which energizes the high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps.

  1. Battery voltage must be between 9-16 V.
  2. High beam headlamps ON.

DTC B2580 01

The BCM detects a short to voltage in the headlamp high beam relay control circuit.

DTC B2580 02

The BCM detects a short to ground in the headlamp high beam relay control circuit.

DTC B2580 04

The BCM detects an open in the headlamp high beam relay control circuit.

The high beam headlamps and flash to pass will not operate.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the control circuit terminal 18 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  3. Ignition OFF, connect a 3 A fused jumper between the control circuit terminal 18 and ground.
  4. Verify the high beam headlamps illuminate. If the high beam headlamps do not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal 18 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the high beam headlamps illuminate
  5. Test or replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Front Compartment Fuse Block Replacement»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch Park Lamps ON Signal2B257A 002
License Plate Lamp ControlB3883 02B3883 01, B3883 04B3883 01
Front Park and Rear Side Marker Lamps Control - LeftB2585 02B2585 01, B2585 04B2585 01, B2585 04
Front Park and Rear Side Marker Lamps Control - RightB3867 02B3867 01, B3867 04B3867 01, B3867 04
Headlamp Switch Ground2
License Plate Lamp Ground - LeftB3883 01, B3883 04
License Plate Lamp Ground - RightB3883 01, B3883 04
Park Lamp Ground - Left Front1
Park Lamp Ground - Right Front1
Rear Tail/Stop Lamps Ground - Left1
Rear Tail/Stop Lamps Ground - Right1
Side Marker Lamp Ground - Left Rear1
Side Marker Lamp Ground - Right Rear1
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction

When the headlamp switch is placed in the HEAD or PARK position, ground is applied to the park lamp switch ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, tail lamps, and license lamps control circuits illuminating the park, tail, and license lamps.

  1. Battery voltage must be between 9-16 V.
  2. Park lamps ON.

DTC B2585 01 and B2585 04

The BCM detects a short to voltage or an open/high resistance in the left front park lamps control circuit.

DTC B2585 02

The BCM detects a short to ground in the left front park lamps control circuit.

DTC B3867 01 and B3867 04

The BCM detects a short to voltage or an open/high resistance in the right front park lamps control circuit.

DTC B3867 02

The BCM detects a short to ground in the right front park lamps control circuit.

DTC B2585 01

The left park lamps are always ON.

DTC B2585 02 and B2585 04

The left park lamps are always OFF.

DTC B3867 01

The right park lamps are always ON.

DTC B3867 02 and B3867 04

The right park lamps are always OFF.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Diagnostic Aids

When testing at the park lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC B2585

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the appropriate left front park lamp bulb or left rear side marker lamp bulb.
  2. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground. E4J Park Lamp - Left Front socket terminal E2LR Side Marker Lamp - Left Rear socket terminal If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E4J Park Lamp - Left Front socket terminal E2LR Side Marker Lamp - Left Rear socket terminal
  4. Verify the test lamp turns ON and OFF when commanding the Left Park Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate left park/marker lamp.

DTC B3867

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the appropriate right front park lamp bulb or right rear side marker lamp bulb.
  2. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4K Park Lamp - Right Front socket terminal E2RR Side Marker Lamp - Right Rear socket terminal If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E4K Park Lamp - Right Front socket terminal E2RR Side Marker Lamp - Right Rear socket terminal
  4. Verify the test lamp turns ON and OFF when commanding the Right Park Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate right park/marker lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Parking and Turn Signal Lamp Bulb Replacement (Left Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Parking and Turn Signal Lamp Bulb Replacement (Right Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Rear Turn Signal Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Rear Turn Signal Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
LED Backlight Dimming Control Terminal 8 X2B2610 02B2610 04, 1B2610 01, 1
LED Backlight Dimming Control Terminal 9 X7B2610 02B2610 04, 1B2610 01, 1
Child Safety Lock Switch Ground1
Door Lock Switch - Driver Ground1
Door Lock Switch - Passenger Ground1
Headlamp Switch Ground1
Multifunction Switch Ground1
Park Assist Switch Ground1
Steering Wheel Control Switch - Right Ground1
Steering Wheel Control Switch - Left Ground1
Sunroof Switch Ground1
Sunroof Tilt Switch Ground1
Traction Control Switch Ground1
1. Interior Backlighting Malfunction

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference, signal, and B+ voltage reference circuits to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the light emitting diode (LED) dimming control circuits illuminating the interior backlighting to the requested level of brightness.

  1. Battery voltage must be between 9-16 V.
  2. Park lamps ON.

DTC B2610 01

The BCM detects a short to battery in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

DTC B2610 02

The BCM detects a short to ground in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

DTC B2610 04

The BCM detects an open/high resistance in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

The BCM will disable the LED backlight dimming control circuits.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the component with inoperative backlighting. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the appropriate ground circuit terminal and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Connect a test lamp between the appropriate control circuit terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the LED Backlight Dimming ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module. X2 terminal 8 X7 terminal 9 Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module, ignition ON. X2 terminal 8 X7 terminal 9 Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the component with inoperative backlighting.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Instrument Panel Multifunction Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
  2. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Sunroof Switch Replacement»(/buick/encore/i-2012-2016/remont/sun-rooft-topconvertible-top/#sunroof-system)
  4. «Transmission Control Replacement»(/buick/encore/i-2012-2016/remont/automatic-trans/#automatic-transmission-6t40mh8-mhb-repair-instructions-on-vehicle)
  5. «Radio and Telephone Control Switch Replacement»(/buick/encore/i-2012-2016/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  6. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Dome Lamps Control - Terminal 1 X7B2615 0211
Dome/Reading Lamps - Front Ground1
Dome Lamp - Rear Ground1
1. Dome Lamps Malfunction

The body control module (BCM) applies battery voltage to the dome/reading lamps through the dome/reading lamp control circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-ajar input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the dome/reading lamp control circuit, providing battery voltage to dome/reading lamps. In the event that any of these courtesy lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.

Battery voltage must be between 9-16 V.

The BCM detects a short to ground in the dome lamps control circuit terminal 1 X7.

The BCM will disable the dome lamps control circuit.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

  1. «Interior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Interior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X5 harness connector at the K9 Body Control Module.
  4. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the E37A Dome/Reading Lamps - Front and E36AH Dome Lamp. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 15 ohms between the appropriate ground circuit terminal listed below and ground. E37A Dome/Reading Lamps - Front terminal 6 E36AH Dome Lamp - terminal 2 If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E37A Dome/Reading Lamps - Front terminal 2 E36AH Dome Lamp - terminal 3
  7. Verify the test lamp turns ON and OFF when commanding the Courtesy Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the inoperative dome/reading lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Dome Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Center Reading Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Center Reading Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
LED Amber Indicator Dimming Control Terminal 5 X1B2625 0211
Child Safety Lock Switch Indicator Control444
Lane Departure Warning Switch Indicator ControlB0987 06B0987 063
Park Assist Switch Indicator Control22B0968 01
1. Interior Backlighting Malfunction 2. Park Assist System Malfunction 3. Lane Departure Warning System Malfunction 4. Power Door Child Lock Malfunction

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference, signal, and B+ voltage reference circuits to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED backlight dimming control circuit illuminating the child safety lock switch , park assist switch, and lane departure warning switch amber LED's to the requested level of brightness.

  1. Battery voltage must be between 9-16 V.
  2. Park lamps ON.

The BCM detects a short to ground in the indicator dimming control circuit terminal 5 X1.

The child safety lock, park assist switch, and lane departure warning switch amber indicators are inoperative.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

  1. «Interior Lights Dimming Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Interior Lights Dimming Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Door Lock/Indicator Schematics (Encore)»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , «Door Lock/Indicator Schematics (Trax)»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems)
  3. «Object Detection Schematics (Encore)»(/buick/encore/i-2012-2016/remont/collisionavoidance/#object-detection-system-and-pedestrian-protection-system) , «Object Detection Schematics (Trax)»(/buick/encore/i-2012-2016/remont/collisionavoidance/#object-detection-system-and-pedestrian-protection-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the appropriate harness connector listed below at the S48E Multifunction Switch - Center Console. X1 X2
  2. Connect a test lamp between the control circuit terminal 8 and ground, ignition ON.
  3. Verify the test lamp turns ON and OFF when commanding the Child Safety Lock Indicator ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  4. Test or replace the appropriate switch at the S48E Multifunction Switch - Center Console.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Instrument Panel Multifunction Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ambient Light Sensor SignalB2645 03B2645 07B2645 07
Low Beam Headlamp Control - LeftB2575 02B2575 04B2575 01, B2575 04
Low Beam Headlamp Control - RightB2699 02B2699 04B2699 01, B2699 04
Ambient Light Sensor GroundB2645 07
Headlamp Ground - Left1
Headlamp Ground - Right1
1. Headlamps Malfunction

The ambient light sensor is used to monitor outside lighting conditions. The body control module (BCM) provides a 5-volt reference signal to the ambient light sensor. Depending on outside lighting conditions, the ambient light sensor provides a voltage signal to the BCM that will vary between 0.2 and 4.9 volts. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic headlamp system control when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the low beam headlamps (DRLs) ON by applying low voltage to the low beam headlamp control circuits illuminating the low beam headlamps at reduced intensity. Any function or condition that turns on the headlamps will cancel DRL operation.

Battery voltage must be between 9-16 V.

DTC B2645 03

The BCM detects a short to ground in the ambient light sensor signal circuit.

DTC B2645 07

  1. The BCM detects a short to voltage or an open/high resistance in the ambient light sensor signal circuit.
  2. The BCM detects an open/high resistance in the ambient light sensor ground circuit.
  1. Automatic headlamp system and daytime running lamps are inoperative.
  2. The BCM defaults to low light status and commands the low beam headlamps ON.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, open and close drivers door, disconnect the harness connector at the B10 Ambient Light Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 6 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Ambient Light Sensor parameter is greater than 4.65 V. If 4.65 V or less Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If greater than 4.65 V
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6.
  6. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 V. If 0.196 V or greater Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 5 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 0.196 V
  7. Test or replace the B10 Ambient Light Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Sun Load Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/manual-hvac-system/#hvac-system-manual)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F2DA (BCM 2) Fuse B+111
Accent Lamp Control - Terminal 7 X6B2652 0211
Accent Lamp - Left Instrument Panel Ground1
Accent Lamp - Instrument Panel Ground1
Accent Lamp - Right Instrument Panel Ground1
1. Interior Accent Lighting Malfunction

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference signal and B+ to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

  1. Battery voltage must be between 9-16 V.
  2. Park lamps ON.

The BCM detects a short to ground in the accent lamps control circuit.

The BCM will disable the accent lamps control circuit.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the X1 harness connector at the appropriate E1 Accent Lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 1 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Connect a test lamp between the control circuit terminal 2 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Accent Lighting 1 ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E1 Accent Lamp

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Warning Switch Signal111B3596 00
Hazard Warning Switch LED Backlighting Control222
Hazard Warning Switch Ground1
1. Hazard Lamps Malfunction 2. Hazard Warning Switch Backlighting Malfunction

The hazard flashers may be activated in any power mode. The hazard warning switch signal circuit is momentarily grounded when the hazard warning switch is pressed. The body control module (BCM) responds to the hazard warning switch signal input by supplying battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard warning switch is activated, the BCM sends a serial data message to the instrument cluster requesting both turn signal indicators to be cycled ON and OFF.

  1. Battery voltage must be between 9-16 V.
  2. Hazard lamps ON.

The hazard warning switch input is Active for longer than 60 seconds.

The hazard lamps are inoperative.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S26 Hazard Warning Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 7 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Ignition ON.
  4. Verify the scan tool Hazard Lamps Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 10 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground.
  6. Verify the scan tool Hazard Lamps Switch parameter is Active. If not Active Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 10 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Test or replace the S26 Hazard Warning Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Hazard Warning and Accessory Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch Headlamps OFF SignalB257A 0011
Headlamp Switch Headlamps ON SignalB257A 0011
Headlamp Switch Park Lamps ON Signal2B257A 002
Turn Signal/Multifunction Switch Flash To Pass SignalB3806 0011
Turn Signal/Multifunction Switch High Beam SignalB3650 0811
Headlamp Switch Ground1
Turn Signal/Multifunction Switch Ground1
1. Headlamps Malfunction 2. Park, License, and/or Tail Lamps Malfunction

When the low beam headlamps are on and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the body control module (BCM) through the high beam signal circuit. The BCM responds to the high beam request by applying ground to the high beam relay control circuit which energizes the high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps.

Battery voltage must be between 9-16 V.

The BCM detects a short to ground in the turn signal/multifunction switch high beam signal circuit.

The high beam headlamps will not operate.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 3 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool High Beam Select Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.
  6. Verify the scan tool High Beam Select Switch parameter is Active. If not Active Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Test or replace the S78 Turn Signal/Multifunction Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turn Signal Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column) , «Turn Signal Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch Headlamps OFF SignalB257A 0011
Headlamp Switch Headlamps ON SignalB257A 0011
Headlamp Switch Park Lamps ON Signal2B257A 002
Turn Signal/Multifunction Switch Flash To Pass SignalB3806 0011
Turn Signal/Multifunction Switch High Beam SignalB3650 0811
Headlamp Switch Ground1
Turn Signal/Multifunction Switch Ground1
1. Headlamps Malfunction 2. Park, License, and/or Tail Lamps Malfunction

When the turn signal/multifunction switch is momentarily placed in the flash to pass position, ground is applied to the body control module (BCM) through the flash to pass signal circuit. The BCM responds to the flash to pass request by applying ground to the high beam relay control circuit which energizes the high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps. The high beam headlamps will only illuminate for as long at the flash to pass switch is activated.

Battery voltage must be between 9-16 V.

The BCM detects a short to ground in the turn signal/multifunction switch flash to pass signal circuit.

The high beam lamps and the high beam indicator on the instrument cluster are always ON.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 3 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Headlamps Flash Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 3.
  6. Verify the scan tool Headlamps Flash Switch parameter is Active. If not Active Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Test or replace the S78 Turn Signal/Multifunction Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turn Signal Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column) , «Turn Signal Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00
Headlamp Switch Park Lamps ON Signal2B257A 002
License Plate Lamp ControlB3883 02B3883 01, B3883 04B3883 01
Park Lamps Control - LeftB2585 02B2585 04B2585 01, B2585 04
Park Lamps Control - RightB3867 02B3867 04B3867 01, B3867 04
Stop Lamp Control - LeftB3881 02B3881 01, B3881 04B3881 01, B3881 04
Stop Lamp Control - RightB3882 02B3882 01, B3882 04B3882 01, B3882 04
Headlamp Switch Ground2
License Plate Lamp Ground - Left1
License Plate Lamp Ground - Right1
Park Lamp Ground - Left Front1
Park Lamp Ground - Right Front1
Rear Tail/Stop Lamps Ground - Left1
Rear Tail/Stop Lamps Ground - Right1
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction

The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right stop lamp control circuits as well as the center high mounted stop lamp (CHMSL) control circuit illuminating the left and right stop lamps and the CHMSL.

  1. Battery voltage must be between 9-16 V.
  2. Brakes APPLIED.

DTC B3881 01 and B3881 04

  1. The BCM detects a short to voltage or an open/high resistance in the left stop lamp control circuit.
  2. The BCM detects a short to ground or an open/high resistance in the F5DA (BCM 5) fuse B+ circuit.

DTC B3881 02

The BCM detects a short to ground in the left rear tail lamp control circuit.

DTC B3882 01 and B3882 04

The BCM detects a short to voltage or an open/high resistance in the right stop lamp control circuit.

DTC B3882 02

The BCM detects a short to ground in the right rear tail lamp control circuit.

The appropriate stop lamp will not operate.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

When testing at the stop lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC B3881

  1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X2 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the E5AA Tail/Stop Lamp - Left bulb.
  5. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the Left Stop Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the E5AA Tail/Stop Lamp - Left.

DTC B3882

  1. Ignition OFF, exterior lamps OFF, trunk latch latched, remove the E5AB Tail/Stop Lamp - Right bulb.
  2. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Right Stop Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the E5AB Tail/Stop Lamp - Right.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Tail Lamp Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Tail Lamp Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Stop and Tail Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Stop and Tail Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
License Plate Lamp ControlB3883 02B3883 01, B3883 04B3883 01
License Plate Lamp Ground - RightB3883 01, B3883 04
License Plate Lamp Ground - LeftB3883 01, B3883 04

When the headlamp switch is placed in the HEAD or PARK position, ground is applied to the park lamp switch ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, tail lamps, and license lamps control circuits illuminating the park, tail, and license lamps.

Battery voltage must be between 9-16 V.

DTC B3883 01

Headlamp switch in OFF position.

DTC B3883 02 or B3883 04

Headlamp switch in PARK or ON positions.

DTC B3883 01

  1. The BCM detects a short to voltage in the license lamps control circuit.
  2. The BCM detects an open/high resistance in the license lamps ground circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F5DA (BCM 1) fuse B+ circuit.

DTC B3883 02

The BCM detects a short to ground in the license lamps control circuit.

DTC B3883 04

  1. The BCM detects an open/high resistance in the license lamps control circuit.
  2. The BCM detects an open/high resistance in the license lamps ground circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F5DA (BCM 1) fuse B+ circuit.

DTC B3883 01

License lamps always ON.

DTC B3883 02 or B3883 04

License lamps inoperative.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove both E7 License Plate Lamp Bulbs.
  2. Test for less than 5 ohms between each ground circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the E7L License Plate Lamp - Left control circuit terminal 1 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Ignition OFF.
  6. Connect a test lamp between the E7R License Plate Lamp - Right control circuit terminal 1 and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If the test lamp turns ON and OFF
  8. Test or replace the appropriate E7 License Plate Lamp Bulb.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rear License Plate Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Center High Mounted Stop Lamp ControlB3884 0211
Center High Mounted Stop Lamp Ground1
1. Stop Lamps Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the right and left stop lamp control circuits, engine control module (ECM), and center high mounted stop lamp control circuit.

  1. Battery voltage must be between 9-16 V.
  2. Brakes APPLIED.

The BCM detects a short to ground in the center high mounted stop lamp control circuit.

The BCM will not illuminate the center high mounted stop lamp.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, exterior lamps OFF, trunk latch latched, disconnect the harness connector at the E6 Center High Mounted Stop Lamp.
  2. Test for less than 5 ohms between the ground circuit terminal B and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit terminal A and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Center Brake Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the E6 Center High Mounted Stop Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «High Mount Stop Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00
F7DA (BCM 7) Fuse B+B3948 01, B3948 04, B3951 01, B3951 04B3948 01, B3948 04, B3951 01, B3951 04
Turn Signal Switch Signal - Left111
Turn Signal Switch Signal - Right111
Turn Signal Control - Left FrontB3948 02B3948 01, B3948 04B3948 01, B3948 04
Turn Signal Control - Right FrontB3949 02B3949 01, B3949 04B3949 01, B3949 04
Turn Signal Lamp Ground - Left FrontB3948 01, B3948 04
Turn Signal Lamp Ground - Right FrontB3949 01, B3949 04
Turn Signal Repeater Lamp Ground - LeftB3948 01, B3948 04
Turn Signal Repeater Lamp Ground - RightB3949 01, B3949 04
Turn Signal/Multifunction Switch Ground1
1. Turn Signal Lamps and/or Indicators Malfunction

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the turn right or turn left position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF.

  1. Battery voltage must be between 9-16 V.
  2. Turn Signal ON.

DTC B3948 01 and B3948 04

  1. The BCM detects an open/high resistance in the left front turn signal control circuit.
  2. The BCM detects an open/high resistance in the left front turn signal ground circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F7DA (BCM 7) fuse B+ circuit.

DTC B3948 02

The BCM detects a short to ground in the left front turn signal control circuit.

DTC B3949 01 and B3949 04

  1. The BCM detects an open/high resistance in the right front turn signal control circuit.
  2. The BCM detects an open/high resistance in the right front turn signal ground circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F5DA (BCM 5) fuse B+ circuit.

DTC B3949 02

The BCM detects a short to ground in the right front turn signal control circuit.

DTC B3948

  1. The left front turn signal is inoperative.
  2. The left turn signal indicator on the instrument cluster flashes rapidly.

DTC B3949

  1. The right front turn signal is inoperative.
  2. The right turn signal indicator on the instrument cluster flashes rapidly.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

When testing at the turn signal lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC B3948

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X5 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E4 Turn Signal Lamp - Left Front.
  5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4LF Turn Signal Lamp - Left Front socket terminal E4Y Turn Signal Repeater Lamp - Left terminal 1 If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E4LF Turn Signal Lamp - Left Front socket terminal E4Y Turn Signal Repeater Lamp - Left terminal 2
  7. Verify the test lamp turns ON and OFF when commanding the Left Front Turn Signal Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the appropriate E4 Turn Signal Lamp Bulb - Left Front.

DTC B3949

  1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X2 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E4 Turn Signal Lamp - Right Front.
  5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4RF Turn Signal Lamp - Left Front socket terminal E4Z Turn Signal Repeater Lamp - Left terminal 1 If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E4RF Turn Signal Lamp - Left Front socket terminal E4Z Turn Signal Repeater Lamp - Left terminal 2
  7. Verify the test lamp turns ON and OFF when commanding the Right Front Turn Signal Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the appropriate E4 Turn Signal Lamp Bulb - Right Front.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Parking and Turn Signal Lamp Bulb Replacement (Left Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Parking and Turn Signal Lamp Bulb Replacement (Right Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00
F7DA (BCM 7) Fuse B+B3948 01, B3948 04, B3951 01, B3951 04B3948 01, B3948 04, B3951 01, B3951 04
Turn Signal Switch Signal - Left111
Turn Signal Switch Signal - Right111
Turn Signal Control - Left RearB3950 02B3950 01, B3950 04B3950 01, B3950 04
Turn Signal Control - Right RearB3951 02B3951 01, B3951 04B3951 01, B3951 04
Turn Signal Lamp Ground - Left RearB3950 01, B3950 04
Turn Signal Lamp Ground - Right RearB3951 01, B3951 04
Turn Signal/Multifunction Switch Ground1
1. Turn Signal Lamps and/or Indicators Malfunction

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the turn right or turn left position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF.

  1. Battery voltage must be between 9-16 V.
  2. Turn Signal ON.

DTC B3950 01 and B3950 04

  1. The BCM detects an open/high resistance in the left rear turn signal control circuit.
  2. The BCM detects an open/high resistance in the left rear turn signal ground circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F5DA (BCM 5) fuse B+ circuit.

DTC B3950 02

The BCM detects a short to ground in the left rear turn signal control circuit.

DTC B3951 01 and B3951 04

  1. The BCM detects an open/high resistance in the right rear turn signal control circuit.
  2. The BCM detects an open/high resistance in the right rear turn signal ground circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F7DA (BCM 7) fuse B+ circuit.

DTC B3951 02

The BCM detects a short to ground in the right rear turn signal control circuit.

DTC B3950

  1. The left rear turn signal is inoperative.
  2. The left turn signal indicator on the instrument cluster flashes rapidly.

DTC B3951

  1. The right rear turn signal is inoperative.
  2. The right turn signal indicator on the instrument cluster flashes rapidly.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

When testing at the turn signal lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC B3950

  1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X2 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the E4LR Turn Signal Lamp Bulb - Left Rear.
  5. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the Left Rear Turn Signal Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the E4LR Turn Signal Lamp Bulb - Left Rear.

DTC B3951

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X5 harness connector at the K9 Body Control Module.
  4. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the E4RR Turn Signal Lamp Bulb - Right Rear.
  5. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  6. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the Right Rear Turn Signal Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the E4RR Turn Signal Lamp Bulb - Right Rear.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rear Turn Signal Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Rear Turn Signal Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Pedal Position Sensor 5 V ReferenceC0277 06, C0890 03, C0161 71C0277 06, C0161 71, C0161 5AC0277 07, C0890 07, C0161 71
Brake Pedal Position Sensor SignalC0277 06, U0140 71C0277 06, C0161 71, C0161 5AC0277 07, C0890 07, C0161 71C0277 09
Center High Mounted Stop Lamp ControlB3884 0222
Rear Tail/Stop Lamp Control - LeftB3881 02B3881 04B3881 01
Rear Tail/Stop Lamp Control - RightB3882 02B3882 04B3882 01
Brake Pedal Position Sensor Low ReferenceC0277 07, C0161 71U0151 00, U0184 00
Center High Mounted Stop Lamp Ground2
Rear Tail/Stop Lamp Ground - Left1
Rear Tail/Stop Lamp Ground - Right1
1. Stop Lamps Malfunction 2. Center High Mounted Stop Lamp Malfunction

The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right stop lamp control circuits as well as the center high mounted stop lamp (CHMSL) control circuit illuminating the left and right stop lamps and the CHMSL.

  1. Battery voltage must be between 9-16 V.
  2. Brakes APPLIED.

DTC C0277 06

  1. The BCM detects a short to ground or an open/high resistance in the BPP sensor 5 V reference circuit.
  2. The BCM detects a short to ground or an open/high resistance in the BPP sensor signal circuit.

DTC C0277 07

  1. The BCM detects a short to voltage in the BPP sensor 5 V reference circuit.
  2. The BCM detects a short to voltage in the BPP sensor signal circuit.
  3. The BCM detects an open/high resistance in the BPP sensor low reference circuit.

DTC C0277 09

The BCM detects the BPP sensor signal is changing faster than possible under normal operating conditions.

DTC C0277 4B

The DTC will set when the BPP sensor home position is not learned.

DTC C0890 03

The BCM detects a short to ground in the BPP sensor 5 V reference circuit.

DTC C0890 07

  1. The BCM detects a short to voltage in the BPP sensor 5 V reference circuit.
  2. The BCM detects a short to voltage in the BPP sensor low reference circuit.
  1. The Traction Control indicator is commanded ON.
  2. For DTC C0277 4B, the stop lamps may not activate at the expected brake pedal positions.
  1. The condition responsible for setting the DTC no longer exists.
  2. For DTC C0277 07 the ignition must be cycled before the code can be cleared.
  3. For DTC C0277 4B a successful brake pedal position sensor calibration has been performed.
  4. A history DTC will clear once 50 malfunction-free ignition cycles have occurred.
  5. A DTC will not clear the current status until the next ignition cycle.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

DTC C0277 06, C0277 07, C0890 03, and C0890 07

  1. Ignition OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor, ignition ON.
  2. Verify a test lamp illuminates between the appropriate low reference circuit terminal listed below and B+. Terminal 2 - with MH8/MHB Terminal A - without MH8/MHB If the test lamp does not illuminate Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the appropriate 5 V reference circuit terminal listed below and ground. Terminal 1 - with MH8/MHB Terminal C - without MH8/MHB If less than 4.8 V Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If greater than 5.2 V Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If between 4.8-5.2 V
  5. Verify the scan tool Brake Pedal Applied parameter is Inactive. If not Inactive Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the appropriate signal circuit terminal listed below and ground. Terminal 3 - with MH8/MHB Terminal B - without MH8/MHB If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If Inactive
  6. Install a 3 A fused jumper wire between the appropriate 5-volt reference and signal circuit terminals listed below. 5 V reference terminal 1 and signal terminal 3 - with MH8/MHB 5 V reference terminal C and signal terminal B - without MH8/MHB
  7. Verify the scan tool Brake Pedal Applied parameter is Active. If not Active Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  8. Test or replace the B22 Brake Pedal Position Sensor.

DTC C0277 4B

  1. Verify DTC C0277 4B is not set. If DTC C0277 4B is set Ignition ON Perform the BPP sensor recalibration procedure for the K9 Body Control Module. Refer to «Brake Pedal Position Sensor Calibration»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-calibration) . Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC. If the DTC resets, replace the B22 Brake Pedal Position Sensor. If the DTC does not reset All OK. If DTC C0277 4B is not set
  2. All OK.

DTC C0277 09

  1. Verify DTC C0277 09 is not set. If DTC C0277 09 is set Replace the B22 Brake Pedal Position Sensor. Perform the BPP sensor recalibration procedure for the K9 Body Control Module. Refer to «Brake Pedal Position Sensor Calibration»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-calibration) . Verify the DTC does not reset while operating the vehicle under the conditions for running the DTC. If the DTC resets, replace the K9 Body Control Module. If the DTC does not reset All OK. If DTC C0277 09 is not set
  2. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Brake Pedal Position Sensor Calibration»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-calibration)
  2. «Brake Pedal Position Sensor Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-replacement)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Applied SignalC0297 02C0297 021
1. Cruise Control Malfunction

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the right and left stop lamp control circuits, engine control module (ECM), and center high mounted stop lamp control circuit.

  1. Battery voltage must be between 9-16 V.
  2. Brakes APPLIED.

The BCM detects a short to ground or an open/high resistance on the brake applied signal circuit.

The cruise control system is disabled.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Verify that the brake pedal position sensor is properly calibrated.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
  2. Connect a test lamp between the signal circuit terminal 25 and ground, ignition ON.
  3. Verify the test lamp turns ON and OFF while pressing and releasing the brake pedal. If the test lamp is always OFF Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  4. Replace the K20 Engine Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Brake Pedal Position Sensor Calibration»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-calibration)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or ECM replacement, programming, and setup

Symptoms - Lighting

Note. The following steps must be completed before using a symptom table.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using a symptom table in order to verify that all of the following conditions are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to the following: «Exterior Lighting Systems Description and Operation»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-description-and-operation) «Interior Lighting Systems Description and Operation»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-description-and-operation)

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to «Checking Aftermarket Accessories»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Backup Lamps Malfunction (Manual Transmission)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures) , «Backup Lamps Malfunction (Automatic transmission)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  2. «Courtesy Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  3. «Daytime Running Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  4. «Dome Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  5. «Front Fog Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  6. «Hazard Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  7. «Headlamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  8. «Interior Accent Lighting Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  9. «Interior Backlighting Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  10. «Park, License, and/or Tail Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  11. «Rear Compartment Lamp Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  12. «Stop Lamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  13. «Turn Signal Lamps and/or Indicators Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Backup Lamp Switch SignalP0812P08121
Backup Lamps ControlB2545 02B2545 04B2545 01
Backup Lamp Switch GroundP0812
Backup Lamp Ground - Left1
Backup Lamp Ground - Right1
1. Backup Lamps Malfunction

The engine control module (ECM) provides a signal circuit to the backup lamp switch which is permanently grounded. With the engine running and the transmission in the reverse position, the backup lamp switch signal circuit is pulled low and the ECM responds by sending a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamps control circuit illuminating the backup lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the ECM via serial data requesting the BCM to remove battery voltage from the backup lamps control circuit. The engine must be running for the backup lamps to operate.

When testing at the backup lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Engine ON.
  2. Verify the scan tool Reverse Position Switch parameter changes between ON and OFF while shifting the vehicle between the neutral and reverse gears. If the parameter does not change Refer to Backup Lamp Switch Malfunction. If the parameter changes
  3. Verify the backup lamps turn ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool. If the backup lamps do not turn ON and OFF Refer to Backup Lamps Malfunction. If the backup lamps turn ON and OFF
  4. All OK.

Backup Lamp Switch Malfunction

  1. Ignition OFF, exterior lamps OFF, all doors closed, disconnect the harness connector at the B16 Backup Lamp Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Ignition ON.
  4. Verify the scan tool Reverse Position Switch parameter is Off. If not Off Ignition OFF, disconnect the appropriate harness connector listed below at the K20 Engine Control Module. X1 - with M4P X3 - with MR5 Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If Off
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2.
  6. Verify the scan tool Reverse Position Switch parameter is On. If not On Ignition OFF, disconnect the appropriate harness connector listed below at the K20 Engine Control Module, ignition ON. X1 - with M4P X3 - with MR5 Test for less than 1 V between the signal circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If On
  7. Test or replace the B16 Backup Lamp Switch.

Backup Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the appropriate E5 Backup Lamp bulb at the appropriate E42 Tail Lamp Assembly.
  2. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E5 Backup Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Backup Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Backup Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Backup Lamp Switch Replacement»(/buick/encore/i-2012-2016/remont/manual-trans/#manual-transmission-m20m32-mr5)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or ECM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Backup Lamps ControlB2545 02B2545 04B2545 01
Backup Lamp Ground - Left1
Backup Lamp Ground - Right1
1. Backup Lamps Malfunction

With the engine running and the transmission in the reverse position, the transmission control module (TCM) sends a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamps control circuit illuminating the backup lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove battery voltage from the backup lamps control circuit. The engine must be running for the backup lamps to operate.

When testing at the backup lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the appropriate E5 Backup Lamp bulb at the appropriate E42 Tail Lamp Assembly.
  2. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E5 Backup Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Backup Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Backup Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Courtesy Lamps Control - Terminal 2 X7B1480 0211
Dome/Reading Lamps - Front Ground1
Dome Lamp - Rear Ground1
Sunshade - Left Ground1
Sunshade - Right Ground1
1. Courtesy Lamps Malfunction

The body control module (BCM) supplies battery voltage to the reading lamps and sunshade mirror lamps via the courtesy lamp control circuit. The front reading lamps are controlled by an individual switch that is activated by the operator when additional cabin lighting is required. In the event that the reading lamps or sunshade lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.

Schematic Reference

  1. «Interior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Interior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the appropriate component listed below. E37A Dome/Reading Lamps E36AH Dome Lamp A3L Sunshade - Left A3R Sunshade - Right
  2. Test for less than 15 ohms between the appropriate ground circuit terminal listed below and ground. E37A Dome/Reading Lamps - terminal 6 E36AH Dome Lamp - terminal 2 A3L Sunshade - Left terminal B A3R Sunshade - Right terminal B If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground. E37A Dome/Reading Lamps - terminal 1 E36AH Dome Lamp - terminal 4 A3L Sunshade - Left terminal A A3R Sunshade - Right terminal A
  4. Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the inoperative courtesy lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Dome Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Center Reading Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Center Reading Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F7DA (BCM 3) Fuse B+11
Daytime Running Lamp Relay Control (with T4A)222
Daytime Running Lamp Control - Left (with T4A)222
Daytime Running Lamp Control - Right (with T4A)222
Daytime Running Lamp Relay Ground - Left (with T4A)2
Daytime Running Lamp Relay Ground - Right (with T4A)2
Daytime Running Lamp Ground - Left (with T4A)2
Daytime Running Lamp Ground - Right (with T4A)2
Headlamp Ground - Left1
Headlamp Ground - Right1
1. Headlamps Malfunction 2. Daytime Running Lamps Malfunction

Daytime Running Lamps - with TR6

The ambient light sensor is used to monitor outside lighting conditions. The body control module (BCM) provides a low reference ground and 5-volt reference signal to the ambient light sensor. Depending on outside lighting conditions, the ambient light sensor provides a voltage signal to the BCM that will vary between 0.2 and 4.9 volts. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic headlamp system control when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the low beam headlamps (DRLs) ON by applying low voltage to the low beam headlamp control circuits illuminating the low beam headlamps at reduced intensity. Any function or condition that turns on the headlamps will cancel DRL operation.

Daytime Running Lamps - with T4A

The ambient light sensor is used to monitor outside lighting conditions. The body control module (BCM) provides a low reference ground and 5-volt reference signal to the ambient light sensor. Depending on outside lighting conditions, the ambient light sensor provides a voltage signal to the BCM that will vary between 0.2 and 4.9 volts. The BCM monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic headlamp system control when the headlamp switch is in the AUTO position. In daylight conditions, the BCM responds by applying battery voltage to the left and right daytime running lamp relay control circuits which energizes both daytime running lamp relays. With the daytime running lamp relays energized, the switch contacts close allowing battery voltage to flow to the daytime running lamp control circuits illuminating the left and right daytime running lamp.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the low beam headlamps turn on & off when commanding the Low Beam Headlamps ON and OFF with a scan tool. If the low beam headlamps do not turn ON and OFF Refer to «Headlamps Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures) . If the low beam headlamps turn ON and OFF
  3. Ignition ON, park brake released.
  4. Verify the scan tool BCM Park Brake Status parameter displays released. If the park brake status parameter does not display released Refer to «Brake Warning Indicator Malfunction (Without J41)»(/buick/encore/i-2012-2016/remont/mechanical-hydraulic/#hydraulic-brake-system) , «Brake Warning Indicator Malfunction (With J41)»(/buick/encore/i-2012-2016/remont/mechanical-hydraulic/#hydraulic-brake-system) . If the parameter displays released
  5. Refer to Circuit/System Testing.

Daytime Running Lamps Malfunction - with TR6

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, open and close drivers door, disconnect the harness connector at the B10 Ambient Light Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 6 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Ambient Light Sensor parameter is greater than 4.65 V. If 4.65 V or less Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If greater than 4.65 V
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6.
  6. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 V. If 0.196 V or greater Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 5 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 0.196 V
  7. Test or replace the B10 Ambient Light Sensor.

Daytime Running Lamps Malfunction - with T4A

  1. Ignition OFF, exterior lamps OFF, remove the appropriate E4 Daytime Running Lamp bulb.
  2. Test for less than 15 ohms between the ground circuit at the socket terminal and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Install the E4 Daytime Running Lamp Bulb.
  4. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
  5. Test for less than 15 ohms between the appropriate ground circuit terminal listed below and ground. Terminal G3 - left daytime running lamp Terminal D9 - right daytime running lamp If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  6. Connect the X2 harness connector at the X50A Fuse Block - Underhood.
  7. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
  8. Connect a 3 A fused jumper between the appropriate control circuit terminal listed below and B+. Terminal H1 - left daytime running lamp Terminal G2- left daytime running lamp
  9. Verify the appropriate E4 Daytime Running Lamp illuminates. If the daytime running lamp does not illuminate Ignition OFF, remove the appropriate E4 Daytime Running Lamp. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the appropriate E4 Daytime Running Lamp. If the daytime running lamp illuminates
  10. Ignition OFF, connect the X1 harness connector at the X50A Fuse Block - Underhood.
  11. Disconnect the X7 harness connector at the K9 Body Control Module, ignition ON.
  12. Verify a test lamp does not illuminate between the control circuit terminal 8 and ground. If the test lamp illuminates Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the test lamp does not illuminate
  13. Ignition OFF, connect a 3 A fused jumper between the control circuit terminal 8 and B+, ignition ON.
  14. Verify both daytime running lamps illuminate. If the daytime running lamps do not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the X50A Fuse Block - Underhood. If the daytime running lamps illuminate
  15. Test or replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Sun Load Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/manual-hvac-system/#hvac-system-manual)
  2. «Front Compartment Fuse Block Replacement»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2615 02B2615 02
Dome Lamps Control - Terminal 1 X7B2615 0211
Dome/Reading Lamps - Front Ground1
Dome Lamp - Rear Ground1
1. Dome Lamps Malfunction

When any door is opened, the door ajar switch contacts close and the body control module (BCM) receives a door-open input. The BCM illuminates the dome lamp when any door is opened or a door lock/unlock request is activated with the key fob. After all doors have been closed, the dome lamp will remain illuminated approximately 3 seconds after the last door closes. In the event that the dome lamp were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the dome lamp control circuit to prevent total battery discharge.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Door Ajar Sw. parameter changes between Active and Inactive while opening and closing each vehicle door. If the parameter does not change Refer to «Door Ajar Indicator Malfunction»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) . If the parameter changes
  3. Verify the dome lamps turn ON and OFF while commanding the Courtesy Lamps ON and OFF with a scan tool. If the dome lamps do not turn ON and OFF Refer to Circuit/System Testing. If the dome lamps turn ON and OFF
  4. All OK.
  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the E37A Dome/Reading Lamps - Front and E36AH Dome Lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the appropriate ground circuit terminal listed below and ground. E37A Dome/Reading Lamps - Front terminal 6 E36AH Dome Lamp - terminal 2 If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E37A Dome/Reading Lamps - Front terminal 2 E36AH Dome Lamp - terminal 3
  4. Verify the test lamp turns ON and OFF when commanding the Courtesy Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the inoperative dome/reading lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Dome Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Center Reading Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Center Reading Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Front Fog Lamp Fuse B+11
Front Fog Lamp and Instrument Panel Dimmer Switch B+B257B 03, B1405 03B257B 03
Front Fog Lamp and Instrument Panel Dimmer Switch SignalB257B 03B257B 031
Front Fog Lamp Relay ControlB2530 02, B2530 04B2530 02, B2530 04B2530 01
Front Fog Lamp Control111
Front Fog Lamp Ground - Left1
Front Fog Lamp Ground - Right1
1. Front Fog Lamps Malfunction

The front fog lamp switch is an input to the body control module (BCM) and is contained in the headlamp switch assembly. The BCM supplies voltage to the front fog lamp switch via the front fog lamp and instrument panel dimmer switch B+ circuit. When the front fog lamp switch is pressed, voltage from the B+ circuit is pulled down through the front fog lamp switch resistor. The front fog lamp resistor is part of the resistor ladder that also provides the dimming signals for the instrument panel dimmer switches. The BCM receives the voltage signal through the front fog lamp and instrument panel dimmer switch signal circuit.

The front fog lamp relay is supplied with battery voltage at all times. The front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch. The body control module (BCM) energizes the front fog lamp relay by applying ground to the front fog lamp relay control circuit. When the front fog lamp relay is energized, the relay switch contacts close and battery voltage is applied through the front fog lamp fuse to the front fog lamp control circuit which illuminates the front fog lamps.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, headlamps ON.
  2. Verify the scan tool Front Fog Lamps Switch parameter changes between Active and Inactive while commanding the front fog lamps ON and OFF with the front fog lamp switch. If the parameter does not change Refer to Front Fog Lamp Switch Malfunction. If the parameter changes
  3. Verify the front fog lamps turn ON and OFF when commanding the Front Fog Lamps ON and OFF with a scan tool. If the front fog lamps do not turn ON and OFF Refer to Front Fog Lamps Malfunction. If the front fog lamps turn ON and OFF
  4. Verify the front fog lamp indicator on the instrument cluster turns ON and OFF while commanding the front fog lamps ON and OFF with the front fog lamp switch. If the front fog lamp indicator does not turn ON and OFF Refer to Front Fog Lamp Indicator Malfunction. If the front fog lamp indicator turns ON and OFF
  5. All OK.

Front Fog Lamp Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S30 Headlamp Switch, ignition ON.
  2. Test for B+ between the B+ circuit terminal 1 and ground. If less than B+ Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If B+
  3. Verify a test lamp does not illuminate between the B+ circuit terminal 1 and the signal circuit terminal 12. If the test lamp illuminates Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp does not illuminate
  4. Test for B+ between the B+ circuit terminal 1 and the signal circuit terminal 12. If less than B+ Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 12 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If B+
  5. Test or replace the S30 Headlamp Switch.

Front Fog Lamps Malfunction

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the control circuit terminal 13 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  3. Ignition OFF, connect a 3 A fused jumper between the control circuit terminal 13 and ground.
  4. Remove the front fog lamp fuse at the X50A Fuse Block - Underhood, ignition ON.
  5. Verify a test lamp illuminates between the front fog lamp fuse B+ switch control terminal and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal 13 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  6. Ignition OFF, connect the X5 harness connector at the K9 Body Control Module.
  7. Install the front fog lamp fuse at the X50A Fuse Block - Underhood.
  8. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E29 Fog Lamp.
  9. Test for less than 5 ohms between the ground circuit terminal A and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  10. Connect a test lamp between the control circuit terminal B and ground, ignition ON.
  11. Verify the test lamp turns ON and OFF when commanding the Front Fog Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  12. Test or replace the appropriate E29 Fog Lamp.

Front Fog Lamp Indicator Malfunction

  1. Ignition ON.
  2. Verify the front fog lamp indicator turns ON and OFF when commanding the Instrument Cluster All Indicators Test ON and OFF with a scan tool. If the front fog lamp indicator is always OFF or remains ON Replace the P16 Instrument Cluster. If the front fog lamp indicator turns ON and OFF
  3. Replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Front Fog Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Front Fog Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Front Compartment Fuse Block Replacement»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or Instrument Cluster replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Warning Switch Signal111B3596 00
Hazard Warning Switch LED Backlighting Control222
Hazard Warning Switch Ground1
1. Hazard Lamps Malfunction 2. Hazard Warning Switch Backlighting Malfunction

The hazard flashers may be activated in any power mode. The hazard warning switch signal circuit is momentarily grounded when the hazard warning switch is pressed. The body control module (BCM) responds to the hazard warning switch signal input by supplying battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard warning switch is activated, the BCM sends a serial data message to the instrument cluster requesting both turn signal indicators to be cycled ON and OFF.

The instrument panel dimmer switch controls are located on the headlamp switch assembly and are used to increase and decrease the brightness of the interior backlighting components. When the instrument panel dimmer switch is placed in a desired brightness position, the body control module (BCM) receives a signal from the instrument panel dimmer switch and responds by applying a pulse width modulated (PWM) voltage to the hazard switch LED backlighting control circuit illuminating the LED to the desired level of brightness.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Hazard Lamps Switch parameter changes between Active and Inactive while commanding the hazard lamps ON and OFF with the hazard warning switch. If the parameter does not change Refer to Hazard Warning Switch Malfunction. If the parameter changes
  3. Verify all left and right turn signal lamps turn ON and OFF while commanding the hazard lamps ON and OFF with the hazard warning switch. If all turn signal lamps do not turn ON and OFF Refer to «Turn Signal Lamps and/or Indicators Malfunction»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-diagnostic-information-and-procedures) If all turn signal lamps turn ON and OFF
  4. Verify the hazard warning switch backlighting turns ON and OFF while commanding the Hazard Lamps Switch Backlight ON and OFF with a scan tool. If the hazard warning switch backlighting does not turn ON and OFF Refer to Hazard Warning Switch Backlighting Malfunction. If the hazard warning switch backlighting turns ON and OFF
  5. All OK.

Hazard Warning Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S26 Hazard Warning Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 7 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Ignition ON.
  4. Verify the scan tool Hazard Lamps Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 10 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground.
  6. Verify the scan tool Hazard Lamps Switch parameter is Active. If not Active Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 10 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Test or replace the S26 Hazard Warning Switch.

Hazard Warning Switch Backlighting Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S26 Hazard Warning Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 7 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit terminal 5 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Hazard Lamps Switch Backlight ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the S26 Hazard Warning Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Hazard Warning and Accessory Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F3DA (BCM 3) Fuse B+B2699 01, B2699 04B2699 01, B2699 04
F4DA (BCM 4) Fuse B+B2575 01, B2575 04B2575 01, B2575 04
Low Beam Headlamp Control - LeftB2575 02B2575 04B2575 01, B2575 04
Headlamp High Beam Relay ControlB2580 02, B2580 04B2580 02, B2580 04B2580 01
Low Beam Headlamp Control - RightB2699 02B2699 04B2699 01, B2699 04
High Beam Headlamp Control - Left222
High Beam Headlamp Control - Right222
Headlamp Switch Headlamps OFF SignalB257A 0033
Headlamp Switch Headlamps ON SignalB257A 0033
Turn Signal/Multifunction Switch Flash To Pass SignalB3806 0044
Turn Signal/Multifunction Switch High Beam SignalB3650 0844
Headlamp Ground - Left1
Headlamp Ground - Right1
Headlamp Switch Ground3
Turn Signal/Multifunction Switch Ground4
1. Headlamps Malfunction - Low Beam 2. Headlamps Malfunction - High Beam 3. Headlamp Switch Malfunction 4. Turn Signal/Multifunction Switch Malfunction

The body control module (BCM) monitors three signal circuits from the headlamp switch. When the headlamp switch is in the AUTO position, all three signal circuits are open. When placed in the AUTO position, the BCM monitors inputs from the ambient light sensor to determine if headlamps are required or if daytime running lamps will be activated based on outside lighting conditions. When the headlamp switch is placed in the OFF position, the headlamp switch headlamps OFF signal circuit is grounded, indicating to the BCM that the exterior lamps should be turned OFF. With the headlamp switch in the PARK position, the headlamp switch park lamps ON signal circuit is grounded, indicating that the park lamps have been requested. When the headlamp switch is placed in the HEADLAMP position, both the headlamp switch park lamps ON signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The BCM responds to the inputs by illuminating the park lamps and headlamps. When the low beam headlamps are requested, the BCM applies B+ to both low beam headlamp control circuits illuminating the low beam headlamps.

The high beam and flash to pass functions are contained within the turn signal/multifunction switch. The BCM provides the turn signal/multifunction switch with two signal circuits, the high beam signal circuit and the flash to pass signal circuit. When the low beam headlamps are ON and the turn signal/multifunction switch is placed in the high beam position, ground is applied to the BCM through the high beam signal circuit. The BCM responds to the high beam request by applying ground to the high beam relay control circuit which energizes the high beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps.

When the turn signal/multifunction switch is momentarily placed in the flash to pass position, ground is applied to the BCM through the flash to pass signal circuit. The BCM responds by applying ground to the high beam relay control circuit which energizes the high beam relay illuminating the high beams for a brief moment or until the flash to pass switch is released.

Schematic Reference

  1. «Headlights/Daytime Running Lights (DRL) Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Headlights/Daytime Running Lights (DRL) Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Headlamps On Switch parameter changes between Active and Inactive while commanding the headlamp ON and OFF with the headlamp switch. If the parameter does not change Refer to Headlamp Switch Malfunction. If the parameter changes
  3. Verify the scan tool Automatic Headlamps Disable Switch parameter changes between Active and Inactive while commanding the automatic lamp control ON and OFF with the headlamp switch. If the parameter does not change Refer to Headlamp Switch Malfunction. If the parameter changes
  4. Verify the scan tool Headlamps Flash Switch parameter changes between Active and Inactive while commanding the flash to pass ON and OFF with the turn signal/multifunction switch. If the parameter does not change Refer to Turn Signal/Multifunction Switch Malfunction. If the parameter changes
  5. Verify the scan tool High Beam Select Switch parameter changes between Active and Inactive while commanding the high beams ON and OFF with the turn signal/multifunction switch. If the parameter does not change Refer to Turn Signal/Multifunction Switch Malfunction. If the parameter changes
  6. Verify the left low beam/daytime running lamp turn ON and OFF when commanding the Left Low Beam/Daytime Running Lamp ON and OFF with a scan tool. If the left low beam/daytime running lamp does not turn ON and OFF Refer to Headlamps Malfunction - Low Beam. If the left low beam/daytime running lamp turns ON and OFF
  7. Verify the right low beam/daytime running lamp turn ON and OFF when commanding the Right Low Beam/Daytime Running Lamp ON and OFF with a scan tool. If the right low beam/daytime running lamp does not turn ON and OFF Refer to Headlamps Malfunction - Low Beam. If the right low beam/daytime running lamp turns ON and OFF
  8. Verify the high beams turn ON and OFF when commanding the High Beams ON and OFF with a scan tool. If the high beams do not turn ON and OFF Refer to Headlamps Malfunction - High Beam. If the high beams turn ON and OFF
  9. Verify the high beam indicator on the instrument cluster turns ON and OFF while commanding the All Indicators Test ON and OFF with a scan tool. If the high beam indicator does not turn ON and OFF Refer to High Beam Indicator Malfunction. If the high beam indicator turns ON and OFF
  10. All OK.

Headlamp Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 6 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Automatic Headlamps Disable Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6.
  6. Verify the scan tool Automatic Headlamps Disable Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 5 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Verify the scan tool Park Lamps Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  8. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 6.
  9. Verify the scan tool Park Lamps Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  10. Verify the scan tool Headlamps On Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  11. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 6.
  12. Verify the scan tool Headlamps On Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  13. Test or replace the S30 Headlamp Switch.

Turn Signal/Multifunction Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 3 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool High Beam Select Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 3.
  6. Verify the scan tool High Beam Select Switch parameter is Active. If not Active Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Verify the scan tool Headlamps Flash Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  8. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 3.
  9. Verify the scan tool Headlamps Flash Switch parameter is Active. If not Active Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  10. Test or replace the S78 Turn Signal/Multifunction Switch.

Headlamps Malfunction - Low Beam

  1. Ignition OFF, exterior lamps OFF, remove the appropriate E4 Headlamp - Low Beam bulb.
  2. Test for less than 10 ohms between the ground circuit at the socket terminal and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the appropriate Low Beam/Daytime Running Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E4 Headlamp - Low Beam.

Headlamps Malfunction - High Beam

  1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the control circuit terminal 18 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit terminal and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  3. Ignition OFF, connect a 3 A fused jumper between the control circuit terminal 18 and ground.
  4. Remove the F31UA fuse at the X50A Fuse Block - Underhood.
  5. Verify a test lamp illuminates between the F31UA fuse B+ switch control terminal and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal 18 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  6. Ignition OFF, connect the X5 harness connector at the K9 Body Control Module.
  7. Install the F31UA fuse at the X50A Fuse Block - Underhood.
  8. Remove the appropriate E4 Headlamp - High Beam bulb.
  9. Test for less than 10 ohms between the ground circuit at the socket terminal and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  10. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  11. Verify the test lamp turns ON and OFF when commanding the High Beams ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  12. Test or replace the appropriate E4 Headlamp - High Beam.

High Beam Indicator Malfunction

  1. Ignition ON.
  2. Verify the high beam indicator turns ON and OFF when commanding the Instrument Cluster All Indicators Test ON and OFF with a scan tool. If the high beam indicator is always OFF or remains ON Replace the P16 Instrument Cluster. If the high beam indicator turns ON and OFF
  3. Replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Relay Replacement (Within an Electrical Center)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  3. «Turn Signal Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column) , «Turn Signal Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column)
  4. «Headlamp Bulb Replacement - Left Side (Trax High Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Bulb Replacement - Left Side (Trax Low Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  5. «Headlamp Bulb Replacement - Right Side (High Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Bulb Replacement - Right Side (Low Beam)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  6. «Front Compartment Fuse Block Replacement»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  7. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or Instrument Cluster replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F2DA (BCM 2) Fuse B+111
Accent Lamp Control - Terminal 7 X6B2652 0211
Accent Lamp - Left Instrument Panel Ground1
Accent Lamp - Instrument Panel Ground1
Accent Lamp - Right Instrument Panel Ground1
1. Interior Accent Lighting Malfunction

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference signal and B+ to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the X1 harness connector at the appropriate E1 Accent Lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 1 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Connect a test lamp between the control circuit terminal 2 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Accent Lighting 1 ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E1 Accent Lamp

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F2DA (BCM 2) Fuse B+11
Instrument Panel Dimmer Switch B+ ReferenceB257B 03, B1405 03B257B 03
Instrument Panel Dimmer Switch SignalB257B 03B257B 03B257B 07
LED Backlight Dimming Control Terminal 8 X2B2610 0211
LED Backlight Dimming Control Terminal 9 X7B2610 0211
Hazard Warning Switch LED Backlight Dimming Control111
LED Amber Indicator Dimming Control Terminal 5 X1B2625 0211
Child Safety Lock Switch Indicator Control333
Door Lock Switch - Driver Ground1
Door Lock Switch - Passenger Ground1
Headlamp Switch Ground2
Multifunction Switch Ground3
Park Assist Switch Ground1
Steering Wheel Control Switch - Right Ground1
Steering Wheel Control Switch - Left Ground1
Sunroof Switch Ground1
Sunroof Tilt Switch Ground1
Traction Control Switch Ground1
1. Interior Backlighting Malfunction 2. Dimmer Switch Malfunction 3. Multifunction Switch Amber Indicator Malfunction

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference signal and a B+ voltage reference to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated (PWM) voltage through the LED dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool LED Backlight Dimming Command parameter changes between a high percentage to a low percentage while operating the dimmer switch from high to low. If the parameter does not change Refer to Dimmer Switch Malfunction. If the parameter changes
  3. Verify the child safety lock switch amber LED indicator turns ON and OFF while commanding the Child Safety Lock Indicator ON and OFF with a scan tool. If the child safety lock switch amber indicator does turn ON and OFF Refer to Multifunction Switch Amber Indicator Malfunction. If the child safety lock switch amber indicator turns ON and OFF
  4. Verify all backlighting components turn ON and OFF while commanding the LED Backlight Dimming ON and OFF with a scan tool. If all backlighting components do not turn ON and OFF Refer to Interior Backlighting Malfunction. If all backlighting components turn ON and OFF
  5. All OK.

Dimmer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S30 Headlamp Switch, ignition ON.
  2. Test for B+ between the B+ circuit terminal 1 and ground. If less than B+ Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If B+
  3. Verify a test lamp does not illuminate between the B+ circuit terminal 1 and the signal circuit terminal 12. If the test lamp illuminates Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp does not illuminate
  4. Test for B+ between the B+ circuit terminal 1 and the signal circuit terminal 12. If less than B+ Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 12 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If B+
  5. Test or replace the S30 Headlamp Switch.

Multifunction Switch Amber Indicator Malfunction

  1. Ignition OFF, disconnect the appropriate harness connector listed below at the S48E Multifunction Switch - Center Console. X1 X2
  2. Connect a test lamp between the control circuit terminal 8 and ground, ignition ON.
  3. Verify the test lamp turns ON and OFF when commanding the Child Safety Lock Indicator ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  4. Test or replace the appropriate switch at the S48E Multifunction Switch - Center Console.

Interior Backlighting Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp illuminates
  3. Ignition OFF, connect the X1 harness connector at the K9 Body Control Module.
  4. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the component with inoperative backlighting. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 15 ohms between the appropriate ground circuit terminal and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  6. Connect a test lamp between the appropriate control circuit terminal and ground.
  7. Verify the test lamp turns ON and OFF when commanding the LED Backlight Dimming ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the appropriate harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the appropriate harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  8. Test or replace the component with inoperative backlighting.

Hazard Warning Switch Backlighting Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S26 Hazard Warning Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 7 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit terminal 5 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Hazard Lamps Switch Backlight ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the S26 Hazard Warning Switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rear Side Door Window Switch Replacement»(/buick/encore/i-2012-2016/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
  2. «Instrument Panel Multifunction Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
  3. «Hazard Warning and Accessory Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  4. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  5. «Door Lock Switch Replacement - Driver Side (Encore)»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , «Door Lock Switch Replacement - Driver Side (Trax)»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems)
  6. «Door Lock Switch Replacement - Passenger Front (Encore)»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , «Door Lock Switch Replacement - Passenger Front (Trax)»(/buick/encore/i-2012-2016/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems)
  7. «Transmission Control Replacement»(/buick/encore/i-2012-2016/remont/automatic-trans/#automatic-transmission-6t40mh8-mhb-repair-instructions-on-vehicle)
  8. «Outside Rearview Mirror Remote Control Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/mirrors/#mirror-system) , «Outside Rearview Mirror Remote Control Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/mirrors/#mirror-system)
  9. «Radio and Telephone Control Switch Replacement»(/buick/encore/i-2012-2016/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  10. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Headlamp Switch Park Lamps ON Signal2B257A 002
License Plate Lamp ControlB3883 02B3883 01, B3883 04B3883 01
Front Park and Rear Side Marker Lamps Control - LeftB2585 02B2585 01, B2585 04B2585 01, B2585 04
Front Park and Rear Side Marker Lamps Control - RightB3867 02B3867 01, B3867 04B3867 01, B3867 04
Headlamp Switch Ground2
License Plate Lamp Ground - LeftB3883 01, B3883 04
License Plate Lamp Ground - RightB3883 01, B3883 04
Park Lamp Ground - Left Front1
Park Lamp Ground - Right Front1
Rear Tail/Stop Lamps Ground - Left1
Rear Tail/Stop Lamps Ground - Right1
Side Marker Lamp Ground - Left Rear1
Side Marker Lamp Ground - Right Rear1
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction

When the headlamp switch is placed in the HEAD or PARK position, ground is applied to the park lamp switch ON signal circuit to the body control module (BCM). The BCM responds by applying voltage to the park lamps, tail lamps, and license lamps control circuits illuminating the park, tail, and license lamps.

When testing at the park lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Park Lamp Switch parameter changes between Active and Inactive while commanding the park lamps ON and OFF with the headlamp switch. If the parameter does not change Refer to Park Lamp Switch Malfunction. If the parameter changes
  3. Verify the left park lamps turn ON and OFF when commanding the Left Park Lamps ON and OFF with a scan tool. If the left park lamps do not turn ON and OFF Refer to Park Lamps Malfunction. If the left park lamps turn ON and OFF
  4. Verify the right park lamps turn ON and OFF when commanding the Right Park Lamps ON and OFF with a scan tool. If the right park lamps do not turn ON and OFF Refer to Park Lamps Malfunction. If the right park lamps turn ON and OFF
  5. Verify the license plate lamps turn ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool. If the license plate lamps do not turn ON and OFF Refer to License Plate Lamps Malfunction. If the license plate lamps turn ON and OFF
  6. All OK.

Park Lamp Switch Malfunction

  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 6 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Park Lamps Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 6.
  6. Verify the scan tool Park Lamps Switch parameter is Active. If not Active Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Test or replace the S30 Headlamp Switch.

Park Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the harness connector at the appropriate park lamp.
  2. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground. E4J Park Lamp - Left Front socket terminal E4K Park Lamp - Right Front socket terminal E2LR Side Marker Lamp - Left Rear socket terminal E2RR Side Marker Lamp - Right Rear socket terminal If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E4J Park Lamp - Left Front socket terminal E4K Park Lamp - Right Front socket terminal E2LR Side Marker Lamp - Left Rear socket terminal E2RR Side Marker Lamp - Right Rear socket terminal
  4. Verify the test lamp turns ON and OFF when commanding the appropriate Park Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module. X4 X5 Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module, ignition ON. X4 X5 Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate park lamp.

License Plate Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove both E7 License Plate Lamp bulbs.
  2. Test for less than 5 ohms between each ground circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the E7L License Plate Lamp - Left control circuit terminal 1 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Connect a test lamp between the E7R License Plate Lamp - Right control circuit terminal 1 and ground, ignition ON.
  6. Verify the test lamp turns ON and OFF when commanding the License Plate Lamps ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  7. Test or replace the appropriate E7 License Plate Lamp bulb.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Headlamp Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Tail Lamp Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Tail Lamp Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Parking and Turn Signal Lamp Bulb Replacement (Left Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Parking and Turn Signal Lamp Bulb Replacement (Right Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  4. «Rear License Plate Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  5. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F2DA (BCM 2) Fuse B+11
Rear Compartment Courtesy Lamp ControlB2570 0211
Rear Compartment Courtesy Lamp Ground1
1. Rear Compartment Lamp Malfunction

The body control module (BCM) applies battery voltage to the rear compartment courtesy lamp through the rear compartment lamp control circuit. When the BCM receives a rear compartment lid open input from the rear compartment lid latch, the BCM applies battery voltage to the rear compartment lamp control circuit illuminating the rear compartment courtesy lamp. In the event that the rear compartment lamp were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the rear compartment lamp control circuit to prevent total battery discharge.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the harness connector at the E8S Rear Compartment Courtesy Lamp.
  2. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Cargo Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the E8S Rear Compartment Courtesy Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Cargo Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Cargo Center Courtesy Lamp Bulb Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00
Brake Pedal Position Sensor 5 V ReferenceC0277 06, C0890 03, C0161 71C0277 06, C0161 71, C0161 5AC0277 07, C0890 07, C0161 71
Brake Pedal Position Sensor SignalC0277 06, U0140 71C0277 06, C0161 71, C0161 5AC0277 07, C0890 07, C0161 71C0277 09
Center High Mounted Stop Lamp ControlB3884 0222
Stop Lamp Control - LeftB3881 02B3881 01, B3881 04B3881 01, B3881 04
Stop Lamp Control - RightB3882 02B3882 01, B3882 04B3882 01, B3882 04
Brake Pedal Position Sensor Low ReferenceC0277 07, C0161 71U0151 00, U0184 00
Center High Mounted Stop Lamp Ground2
Rear Tail/Stop Lamp Ground - Left1
Rear Tail/Stop Lamp Ground - Right1
1. Stop Lamps Malfunction 2. Center High Mounted Stop Lamp Malfunction

The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the BPP sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery voltage to the left and right stop lamp control circuits as well as the center high mounted stop lamp (CHMSL) control circuit illuminating the left and right stop lamps and the CHMSL.

When testing at the stop lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Brake Lamps Command parameter changes between Active and Inactive while pressing and releasing the brake pedal. If the parameter does not change Refer to Brake Pedal Position Sensor Malfunction. If the parameter changes
  3. Verify the left brake lamp turns ON and OFF when commanding the Left Rear Brake/Park Lamp ON and OFF with a scan tool. If the left brake lamp does not turn ON and OFF Refer to Stop Lamps Malfunction. If the left brake lamp turns ON and OFF
  4. Verify the right brake lamp turns ON and OFF when commanding the Right Rear Brake/Park Lamp ON and OFF with a scan tool. If the right brake lamp does not turn ON and OFF Refer to Stop Lamps Malfunction. If the right brake lamp turns ON and OFF
  5. Verify the center high mounted stop lamp turns ON and OFF when commanding the Center Brake Lamp ON and OFF with a scan tool. If the center high mounted stop does not turn ON and OFF Refer to Center High Mount Stop Lamp Malfunction. If the center high mounted stop turns ON and OFF
  6. All OK.

Brake Pedal Position Sensor Malfunction

  1. Ignition OFF, disconnect the harness connector at the B22 Brake Pedal Position Sensor, ignition ON.
  2. Test for less than 1 V between the appropriate low reference circuit terminal listed below and ground. Terminal 2 - with MH8/MHB Terminal A - without MH8/MHB If 1 V or greater Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the low reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If less than 1 V
  3. Test or replace the B22 Brake Pedal Position Sensor.

Stop Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, remove the appropriate E5A Tail/Stop Lamp bulb.
  2. Test for less than 5 ohms between the ground circuit at the socket terminal and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit at the socket terminal and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the appropriate Rear Stop Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module. X4 left stop lamp X5 right stop lamp Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module, ignition ON. X4 left stop lamp X5 right stop lamp Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E5A Tail/Stop Lamp.

Center High Mount Stop Lamp Malfunction

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the harness connector at the E6 Center High Mounted Stop Lamp.
  2. Test for less than 5 ohms between the ground circuit terminal B and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the control circuit terminal A and ground, ignition ON.
  4. Verify the test lamp turns ON and OFF when commanding the Center Stop Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the E6 Center High Mounted Stop Lamp.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «High Mount Stop Lamp Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Brake Pedal Position Sensor Calibration»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-calibration)
  3. «Brake Pedal Position Sensor Replacement»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions__brake-pedal-position-sensor-replacement)
  4. «Stop and Tail Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Stop and Tail Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  5. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04, U152D 00
F7DA (BCM 7) Fuse B+B3948 01, B3948 04, B3951 01, B3951 04B3948 01, B3948 04, B3951 01, B3951 04
Turn Signal Switch Signal - Left222
Turn Signal Switch Signal - Right222
Turn Signal Control - Left FrontB3948 02B3948 01, B3948 04B3948 01, B3948 04
Turn Signal Control - Left RearB3950 02B3950 01, B3950 04B3950 01, B3950 04
Turn Signal Control - Right FrontB3949 02B3949 01, B3949 04B3949 01, B3949 04
Turn Signal Control - Right RearB3951 02B3951 01, B3951 04B3951 01, B3951 04
Turn Signal Lamp Ground - Left FrontB3948 01, B3948 04
Turn Signal Lamp Ground - Right FrontB3949 01, B3949 04
Turn Signal Lamp Ground - Left RearB3950 01, B3950 04
Turn Signal Lamp Ground - Right RearB3951 01, B3951 04
Turn Signal Repeater Lamp Ground - Left1
Turn Signal Repeater Lamp Ground - Right1
Turn Signal/Multifunction Switch Ground2
1. Turn Signal Lamps and/or Indicators Malfunction 2. Turn Signal/Multifunction Switch Malfunction

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the turn right or turn left position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF.

When testing at the turn signal lamp bulb socket, make sure all measurements and test lamp connections are in the correct terminal location and do not come in contact with each other during testing.

Schematic Reference

  1. «Exterior Lights Schematics (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams) , «Exterior Lights Schematics (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-schematic-wiring-diagrams)
  2. «Body Control System Schematics (Encore)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system) , «Body Control System Schematics (Trax)»(/buick/encore/i-2012-2016/remont/communication-devices/#data-communication-system)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify the scan tool Right Turn Signal Switch and Left Turn Signal Switch parameters change between Active and Inactive while cycling the turn signal switch between the right and left positions. If the parameters do not change Refer to Turn Signal/Multifunction Switch Malfunction. If the parameters change
  3. Verify the left front turn signal lamps turn ON and OFF while commanding the Left Front Turn Signal Lamp ON and OFF with a scan tool. If the left front turn signal lamps do not turn ON and OFF Refer to Turn Signal Lamps Malfunction. If the left front turn signal lamps turn ON and OFF
  4. Verify the right front turn signal lamps turn ON and OFF while commanding the Right Front Turn Signal Lamp ON and OFF with a scan tool. If the right front turn signal lamps do not turn ON and OFF Refer to Turn Signal Lamps Malfunction. If the right front turn signal lamps turn ON and OFF
  5. Verify the left rear turn signal lamps turn ON and OFF while commanding the Left Rear Turn Signal Lamp ON and OFF with a scan tool. If the left rear turn signal lamps do not turn ON and OFF Refer to Turn Signal Lamps Malfunction. If the left rear turn signal lamps turn ON and OFF
  6. Verify the right rear turn signal lamps turn ON and OFF while commanding the Right Rear Turn Signal Lamp ON and OFF with a scan tool. If the right rear turn signal lamps do not turn ON and OFF Refer to Turn Signal Lamps Malfunction. If the right rear turn signal lamps turn ON and OFF
  7. Verify the left and right turn signal indicators turn ON and OFF while commanding the All Indicators Test ON and OFF with a scan tool. If the left or right turn signal indictors do not turn ON and OFF Refer to Turn Signal Indicators Malfunction. If the left and right turn signal indictors turn ON and OFF
  8. All OK.

Turn Signal/Multifunction Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 3 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Verify the scan tool Left Turn Signal Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3.
  6. Verify the scan tool Left Turn Signal Switch parameter is Active. If not Active Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  7. Verify the scan tool Right Turn Signal Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 7 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
  8. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 3.
  9. Verify the scan tool Right Turn Signal Switch parameter is Active. If not Active Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 7 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
  10. Test or replace the S78 Turn Signal/Multifunction Switch.

Turn Signal Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, rear hatch latch latched, disconnect the harness connector at the appropriate E4 Turn Signal Lamp.
  2. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4LF Turn Signal Lamp - Left Front socket terminal E4RF Turn Signal Lamp - Right Front socket terminal E4Y Turn Signal Repeater Lamp - Left terminal 1 E4Z Turn Signal Repeater Lamp - Right terminal 1 E4LR Turn Signal Lamp - Left Rear socket terminal E4RR Turn Signal Lamp - Right Rear socket terminal If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground. E4LF Turn Signal Lamp - Left Front socket terminal E4RF Turn Signal Lamp - Right Front socket terminal E4Y Turn Signal Repeater Lamp - Left terminal 2 E4Z Turn Signal Repeater Lamp - Right terminal 2 E4LR Turn Signal Lamp - Left Rear socket terminal E4RR Turn Signal Lamp - Right Rear socket terminal
  4. Verify the test lamp turns ON and OFF when commanding the appropriate Turn Signal Lamp ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module. X5 left turn signals X4 right turn signals Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, disconnect the appropriate harness connector listed below at the K9 Body Control Module, ignition ON. X5 left turn signals X4 right turn signals Test for less than 1 V between the control circuit terminal and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  5. Test or replace the appropriate E4 Turn Signal Lamp.

Turn Signal Indicators Malfunction

  1. Ignition ON.
  2. Verify the left and right turn signal indicators turn ON and OFF while commanding the All Indicators Test ON and OFF with a scan tool. If the left or right turn signal indictors are always OFF or remain ON Replace the P16 Instrument Cluster. If the left and right turn signal indictors turn ON and OFF
  3. Replace the K9 Body Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Parking and Turn Signal Lamp Bulb Replacement (Left Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Parking and Turn Signal Lamp Bulb Replacement (Right Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  2. «Rear Turn Signal Lamp Bulb Replacement (Trax)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Rear Turn Signal Lamp Bulb Replacement (Encore)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  3. «Turn Signal Switch Replacement (Trax)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column) , «Turn Signal Switch Replacement (Encore)»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#steering-wheel-and-steering-column)
  4. «Front Turn Signal Lamp Bulb Replacement (Left hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions) , «Front Turn Signal Lamp Bulb Replacement (Right Hand)»(/buick/encore/i-2012-2016/remont/exterior-lights/#lighting-system-repair-instructions)
  5. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or Instrument Cluster replacement, programming, and setup

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Interior Lights Schematics (Encore)
• Body Control System Schematics (Encore)
• WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE
• Interior Lighting Systems Description and Operation
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Dome Lamp Bulb Replacement
• Front Compartment Fuse Block Replacement
• Instrument Panel Multifunction Switch Replacement (Encore)
• Sunroof Switch Replacement
• Transmission Control Replacement
• Radio and Telephone Control Switch Replacement
• Door Lock/Indicator Schematics (Encore)
• Object Detection Schematics (Encore)
• Sun Load Temperature Sensor Replacement
• Turn Signal Switch Replacement (Trax)
• Brake Pedal Position Sensor Calibration
• Brake Pedal Position Sensor Replacement
• Cruise Control Schematics (Encore)
• Checking Aftermarket Accessories
• Backup Lamp Switch Replacement
• Brake Warning Indicator Malfunction (Without J41)
• Relay Replacement (Within an Electrical Center)
• Rear Side Door Window Switch Replacement
• Outside Rearview Mirror Remote Control Switch Replacement (Encore)
• Backup Lamps Malfunction (Manual Transmission)

More articles — Lighting