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Contents Wiring diagrams Section: Exterior Lights All sections

Lighting System: Diagnosis Chevrolet Spark M300

Exterior Lights ~24867 words

Diagnostic Code Index

DTCDescription
DTC B1395DTC B1395 03 Control Module Voltage Reference Output 1 Circuit Low Voltage DTC B1395 07 Control Module Voltage Reference Output 1 Circuit High Voltage
DTC B1480DTC B1480 02 Battery Rundown Protection Circuit Short to Ground
DTC B2530DTC B2530 01 Front Fog Lamps Control Circuit Short to Battery DTC B2530 02 Front Fog Lamps Control Circuit Short to Ground DTC B2530 04 Front Fog Lamps Control Circuit Open
DTC B2545DTC B2545 01 Backup Lamps Circuit Short to Battery DTC B2545 02 Backup Lamps Circuit Short to Ground DTC B2545 04 Backup Lamps Circuit Open
DTC B2570DTC B2570 02 Trunk Lamp Control Circuit Short to Ground
DTC B2575 or B2699DTC B2575 01 Headlamps Control Circuit Short to Battery DTC B2575 02 Headlamps Control Circuit Short to Ground DTC B2575 04 Headlamps Control Circuit Open DTC B2699 01 Right Headlamp Control Circuit Short to Battery DTC B2699 02 Right Headlamp Control Circuit Short to Ground DTC B2699 04 Right Headlamp Control Circuit Open
DTC B257ADTC B257A 00 Headlamp Switch Input Signals Correlation Malfunction
DTC B2580DTC B2580 01 Headlamp High Beam Control Circuit Short to Battery DTC B2580 02 Headlamp High Beam Control Circuit Short to Ground DTC B2580 04 Headlamp High Beam Control Circuit Open
DTC B2585 or B3867DTC B2585 01 Left Park Lamps Control Circuit Short to Battery DTC B2585 02 Left Park Lamps Control Circuit Short to Ground DTC B2585 04 Left Park Lamps Control Circuit Open DTC B3867 01 Right Park Lamps Control Circuit Short to Battery DTC B3867 02 Right Park Lamps Control Circuit Short to Ground DTC B3867 04 Right Park Lamps Control Circuit Open
DTC B2610DTC B2610 01 Passenger Compartment Dimming 1 Circuit Short to Battery DTC B2610 02 Passenger Compartment Dimming 1 Circuit Short to Ground DTC B2610 04 Passenger Compartment Dimming 1 Circuit Open
DTC B2615DTC B2615 02 Passenger Compartment Dimming 2 Circuit Short to Ground
DTC B2625DTC B2625 01 Display Dimming Pulse Width Modulation Output Circuit Short to Battery DTC B2625 02 Display Dimming Pulse Width Modulation Output Circuit Short to Ground DTC B2625 04 Display Dimming Pulse Width Modulation Output Circuit Open
DTC B2652DTC B2652 02 Passenger Compartment Dimming 3 Circuit Short to Ground
DTC B3596DTC B3596 00 Hazard Lamps Request Circuit Malfunction
DTC B3600DTC B3600 03 Passenger Compartment Dimming Request Signal Circuit Low Voltage DTC B3600 07 Passenger Compartment Dimming Request Signal Circuit High Voltage
DTC B3650DTC B3650 08 High Beam Request Signal Circuit Performance - Signal Invalid
DTC B3806DTC B3806 00 High Beam and Headlamp Flash Select Circuit Malfunction
DTC B3881 or B3882DTC B3881 01 Tail Lamp Circuit Short to Battery DTC B3881 02 Tail Lamp Circuit Short to Ground DTC B3881 04 Tail Lamp Circuit Open DTC B3882 01 Right Tail Lamp Circuit Short to Battery DTC B3882 02 Right Tail Lamp Circuit Short to Ground DTC B3882 04 Right Tail Lamp Circuit Open
DTC B3883DTC B3883 01 License Plate Lamp Circuit Short to Battery DTC B3883 02 License Plate Lamp Circuit Short to Ground DTC B3883 04 License Plate Lamp Circuit Open
DTC B3884DTC B3884 02 Center High Mounted Brake Lamp Circuit Short to Ground
DTC B3948 or B3949DTC B3948 01 Left Front Turn Signal Circuit Short to Battery DTC B3948 02 Left Front Turn Signal Circuit Short to Ground DTC B3948 04 Left Front Turn Signal Circuit Open DTC B3949 01 Right Front Turn Signal Circuit Short to Battery DTC B3949 02 Right Front Turn Signal Circuit Short to Ground DTC B3949 04 Right Front Turn Signal Circuit Open
DTC B3950 or B3951DTC B3950 01 Left Rear Turn Signal Circuit Short to Battery DTC B3950 02 Left Rear Turn Signal Circuit Short to Ground DTC B3950 04 Left Rear Turn Signal Circuit Open DTC B3951 01 Right Rear Turn Signal Circuit Short to Battery DTC B3951 02 Right Rear Turn Signal Circuit Short to Ground DTC B3951 04 Right Rear Turn Signal Circuit Open
DTC C0277 or C0890DTC C0277 06 Brake Pedal Position Sensor Circuit Low Voltage/Open DTC C0277 07 Brake Pedal Position Sensor Circuit High Voltage DTC C0277 09 Brake Pedal Position Sensor Circuit Too Fast Transitions DTC C0277 4B Brake Pedal Position Sensor Circuit Calibration Not Learned DTC C0890 03 Control Module Voltage Reference Output 3 Circuit Low Voltage DTC C0890 07 Control Module Voltage Reference Output 3 Circuit High Voltage
DTC C0297DTC C0297 02 Brake Applied Output Circuit Short to Ground

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F1DA (BCM 1) Fuse B+B101E 43, B1395 03, B1517 07, C0890 03, U0121 00B101E 43, B1395 03, B1517 07, C0890 03, U0121 00
Instrument Panel Dimmer Switch B+ ReferenceB1395 03, B3600 03B3600 03B1395 07
Instrument Panel Dimmer Switch SignalB1395 03, B3600 03B3600 03B3600 07
Instrument Panel Dimmer Switch Low Reference111
1. Interior Backlighting Malfunction

Conditions for Running the DTC

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

Conditions for Setting the DTC

DTC B1395 03

  1. The BCM detects a short to ground in the instrument panel dimmer switch B+ reference circuit.
  2. The BCM detects a short to ground in the instrument panel dimmer switch signal circuit.
  3. The BCM detects a short to ground or an open/high resistance in the F1DA (BCM 1) fuse B+ circuit.

DTC B1395 07

The BCM detects a short to voltage in the instrument panel dimmer switch B+ reference circuit.

Actions Taken When the DTC Sets

The BCM will not dim any interior backlighting. All interior backlighting will default to maximum brightness.

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.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the S36 instrument panel dimmer switch, ignition ON.
  2. Verify a test lamp illuminates between the low reference circuit terminal 2 and B+. If the test lamp does not illuminate 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 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 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. Test for B+ between the B+ reference circuit terminal 1 and ground. If less than B+ Ignition OFF, disconnect the X1 harness connector at the K9 body control module. Test for infinite resistance between the B+ 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 B+ 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 B+
  4. Verify a test lamp does not illuminate between the B+ reference circuit terminal 1 and ground. If the test lamp illuminates Ignition OFF, disconnect the X1 harness connector at the K9 body control module, ignition ON. Test for less than 1 V between the B+ reference circuit terminal 2 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 does not illuminate
  5. Park lamps ON, verify a test lamp does not illuminate between the signal circuit terminal 3 and ground. If the test lamp illuminates 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, replace the K9 body control module. If the test lamp does not illuminate
  6. Ignition ON, park lamps OFF, test for between 57.4 K ohms and 58 K ohms between the signal circuit terminal 3 and ground. If not between 57.4 K ohms and 58 K ohms 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 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 between 57.4 K ohms and 58 K ohms
  7. Test or replace the S36 instrument panel dimmer switch.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Dome Lamps ControlB2615 0222
Reading Lamps ControlB1480 0211
Dome Lamp Ground1, 2
1. Courtesy Lamps Malfunction 2. Dome Lamps Malfunction

Battery voltage must be between 9-16 V.

The BCM detects a short to ground in the reading lamp control circuit.

The BCM will disable the circuit and the reading lamp 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.
  1. Ignition OFF, exterior lamps OFF, disconnect the harness connectors at the E36AH dome lamp.
  2. Connect a test lamp between the appropriate control circuit terminal listed below and ground. E36AH dome lamp - terminal 1 with UE1 E36AH dome lamp - terminal 4 without UE1
  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 E36AH dome lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F13UA (FRT FOG) Fuse B+11
Front Fog Lamp Switch Signal111
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
Turn Signal/Multifunction Switch Ground1
1. Front Fog Lamps Malfunction
  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.
  1. Ignition OFF, disconnect the KR46 front fog lamp relay, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate Replace the X50A fuse block - underhood. If the test lamp illuminates
  3. Verify a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate Replace the X50A fuse block - underhood. If the test lamp illuminates
  4. Ignition OFF, connect a test lamp between the control circuit terminal 85 and B+, ignition ON.
  5. 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 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 Ignition OFF. 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. 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, replace the K9 body control module. If the test lamp turns ON and OFF
  6. Test or replace the KR46 front fog lamp relay.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2545 01, B2545 04, B2615 02B2545 01, B2545 04, B2615 02
Backup Lamp Switch Signal (Manual Transmission)P0812P08121
Backup Lamps ControlB2545 02B2545 01, B2545 04B2545 01
Backup Lamp Switch Ground (Manual Transmission)P0812
Backup Lamp Ground - Left1
Backup Lamp Ground - Right1
1. Backup Lamps Malfunction
  1. Battery voltage must be between 9-16 V.
  2. Engine RUNNING.
  3. Transmission placed in REVERSE gear.

DTC B2545 01 and DTC B2545 04

  1. The BCM detects an open/high resistance in the backup lamps control circuit.
  2. The BCM detects a short to ground or an open/high resistance in the F6DA (BCM 6) fuse B+ circuit.

DTC B2545 02

The BCM detects a short to ground 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.

Diagnostic Aids

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.

  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, exterior lamps OFF, remove the appropriate E5 backup lamp bulb at the appropriate E42 tail lamp assembly. It may take up to 2 minutes for all vehicle systems to power down.
  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 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
  8. Test or replace the appropriate E5 backup lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Compartment Courtesy Lamp ControlB2570 0211
Rear Compartment Courtesy Lamp Ground1
1. Rear Compartment Lamp Malfunction
  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.
  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the E8S rear compartment courtesy lamp. 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. 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 01, B2575 04B2575 04
Low Beam Headlamp Control - RightB2699 02B2699 01, B2699 04B2699 04
Headlamp Ground - LeftB2575 04
Headlamp Ground - RightB2699 04
1. Headlamps Malfunction
  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.

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 appropriate ground circuit terminal listed below and ground. E13L headlamp - left - terminal 1 with T90 E13L headlamp - left - terminal 2 without T90 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. E13L headlamp - left - terminal 2 with T90 E13L headlamp - left - terminal 1 without T90
  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 appropriate ground circuit terminal listed below and ground. E13R headlamp - right - terminal 1 with T90 E13R headlamp - right - terminal 2 without T90 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. E13R headlamp - right - terminal 2 with T90 E13R headlamp - right - terminal 1 without T90
  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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 ON SignalB257A 0011
Turn Signal/Multifunction Switch Ground1
1. Headlamps Malfunction 2. Park, License, and/or Tail Lamps Malfunction

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.
  1. 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.
  2. 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.
  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.
  1. Ignition OFF, 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 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. 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 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 1.
  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 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 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 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 1.
  9. 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 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. Test or replace the S78 turn signal/multifunction switch.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 02B2580 04B2580 01
High Beam Headlamp Control - Left111
High Beam Headlamp Control - Right111
Headlamp Ground - LeftB2575 01, B2575 04
Headlamp Ground - RightB2699 01, B2699 04
1. Headlamps Malfunction
  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.
  1. Ignition OFF, remove the KR48 headlamp high beam relay.
  2. Connect a test lamp between the control circuit terminal 86 and B+, ignition ON.
  3. 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 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 Ignition OFF. 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. 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, replace the K9 body control module. If the test lamp turns ON and OFF
  4. Test or replace the KR48 headlamp high beam relay.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04
Headlamp Switch Park Lamps ON Signal2B257A 002
Front Park and Rear Tail Lamp Control - LeftB2585 02B2585 01, B2585 04B2585 01, B2585 04
Front Park and Rear Tail Lamp Control - RightB3867 02B3867 01, B3867 04B3867 01, B3867 04
Turn Signal/Multifunction Switch Ground2
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
  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 park lamps control circuit.

DTC B2585 02

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

DTC B3867 01 and B3867 04

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

DTC B3867 02

The BCM detects a short to ground in the right 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.

When testing at the park lamp bulb sockets, 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.

DTC B2585

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate left front park lamp or left rear tail lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4N park/turn signal lamp - left socket terminal E5AA tail lamp - left 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. E4N park/turn signal lamp - left socket terminal E5AA tail 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/tail lamp.

DTC B3867

  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 right front park lamp or right rear side marker lamp. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4P park/turn signal lamp - right socket terminal E5AB tail 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
  6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON. E4P park/turn signal lamp - right socket terminal E5AB tail lamp - right rear socket terminal
  7. 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
  8. Test or replace the appropriate right park/tail lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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
1. Interior Backlighting Malfunction
  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.

DTC B2610 02

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

DTC B2610 04

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

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.
  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 listed below and ground. S13D Door Lock Switch - Driver terminal 3 S13P Door Lock Switch - Passenger terminal 3 S36 Instrument Panel Dimmer Switch - terminal 5 S46B Liftgate Unlatch Switch - terminal 6 S32D Seat Heating Switch - Driver terminal 5 S32P Seat Heating Switch - Passenger terminal 5 S70L Steering Wheel Controls Switch - Left terminal 7 S70R Steering Wheel Controls Switch - Right terminal 5 S75 Traction Control Switch - terminal 3 S3 Transmission Shift Lever - terminal 3 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. K33 HVAC control module - terminal 6 X1 S13D Door Lock Switch - Driver terminal 1 S13P Door Lock Switch - Passenger terminal 1 S36 Instrument Panel Dimmer Switch - terminal 4 S46B Liftgate Unlatch Switch - terminal 5 S32D Seat Heating Switch - Driver terminal 6 S32P Seat Heating Switch - Passenger terminal 6 S70L Steering Wheel Controls Switch - Left terminal 6 S70R Steering Wheel Controls Switch - Right terminal 4 S75 Traction Control Switch - terminal 2 S3 Transmission Shift Lever - terminal 8
  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 X2 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 X2 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 component with inoperative backlighting.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2545 01, B2545 04, B2615 02B2545 01, B2545 04, B2615 02
Dome Lamp ControlB2615 0222
Reading Lamp ControlB1480 0211
Dome Lamp Ground1, 2
1. Courtesy Lamps Malfunction 2. Dome Lamps Malfunction

Battery voltage must be between 9-16 V.

  1. The BCM detects a short to ground in the dome lamp control circuit.
  2. The BCM detects a short to ground or an open/high resistance in the F6DA (BCM 6) fuse B+ circuit.

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.
  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 E36AH dome lamp. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground. E36AH dome lamp - terminal 3 with UE1 E36AH dome lamp - terminal 2 without UE1 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
  6. Connect a test lamp between the appropriate control circuit terminal listed below and ground. E36AH dome lamp - terminal 2 with UE1 E36AH dome lamp - terminal 3 without UE1
  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 E36AH dome lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
LED Backlight Dimming Control Terminal 5 X1B2625 02B2625 04B2625 01
  1. Battery voltage must be between 9-16 V.
  2. Ignition ON.

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

The LED backlight dimming control circuit driver is shut down.

  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.
  1. Ignition OFF, disconnect the X1 harness connector at the K33 HVAC control module.
  2. Connect a test lamp between the control circuit terminal 10 and ground.
  3. Verify the test lamp turns ON and OFF while turning the ignition switch ON and OFF. 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 K33 HVAC control module.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Hazard Warning Switch LED Backlight Dimming ControlB2652 0211
Hazard Warning Switch Ground1
1. Interior Backlighting Malfunction
  1. Battery voltage must be between 9-16 V.
  2. Park lamps ON.

The BCM detects a short to ground in the hazard warning switch backlight dimming control circuit.

The BCM will disable the hazard warning switch backlight dimming 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.
  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 3 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 2 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 ControlB2652 0222
Hazard Warning Switch Ground1
1. Hazard Lamps Malfunction 2. Hazard Warning Switch Backlighting Malfunction
  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 warning 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.
  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 8 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 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
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 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 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
  7. Test or replace the S26 hazard warning switch.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F1DA (BCM 1) Fuse B+B101E 43, B1395 03, B1517 07, C0890 03, U0121 00B101E 43, B1395 03, B1517 07, C0890 03, U0121 00
Instrument Panel Dimmer Switch B+ ReferenceB1395 03, B3600 03B3600 03B1395 07
Instrument Panel Dimmer Switch SignalB1395 03, B3600 03B3600 03B3600 07
Instrument Panel Dimmer Switch Low Reference111
1. Interior Backlighting Malfunction
  1. Battery voltage must be between 9-16 V.
  2. Park Lamps ON.

DTC B3600 03

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

DTC B3600 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 maximum brightness.

  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.
  1. Ignition OFF, disconnect the harness connector at the S36 instrument panel dimmer switch, ignition ON.
  2. Verify a test lamp illuminates between the low reference circuit terminal 2 and B+. If the test lamp does not illuminate 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 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 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. Test for B+ between the B+ reference circuit terminal 1 and ground. If less than B+ Ignition OFF, disconnect the X1 harness connector at the K9 body control module. Test for infinite resistance between the B+ 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 B+ 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 B+
  4. Verify a test lamp does not illuminate between the B+ reference circuit terminal 1 and ground. If the test lamp illuminates Ignition OFF, disconnect the X1 harness connector at the K9 body control module, ignition ON. Test for less than 1 V between the B+ reference circuit terminal 2 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 does not illuminate
  5. Park lamps ON, verify a test lamp does not illuminate between the signal circuit terminal 3 and ground. If the test lamp illuminates 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, replace the K9 body control module. If the test lamp does not illuminate
  6. Ignition ON, park lamps OFF, test for between 57.4 K ohms and 58 K ohms between the signal circuit terminal 3 and ground. If not between 57.4 K ohms and 58 K ohms 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 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 between 57.4 K ohms and 58 K ohms
  7. Test or replace the S36 instrument panel dimmer switch.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
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
Turn Signal/Multifunction Switch Ground1
1. Headlamps Malfunction 2. Park, License, and/or Tail Lamps Malfunction

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.
  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 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. 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 6 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 6 and the ground circuit terminal 1.
  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 6 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
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
Turn Signal/Multifunction Switch Ground1
1. Headlamps Malfunction 2. Park, License, and/or Tail Lamps Malfunction

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.
  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 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. 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 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
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 1.
  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 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
  7. Test or replace the S78 turn signal/multifunction switch.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04
Brake Pedal Position Sensor 5 V ReferenceC0277 06, C0890 03, C0161 71C0277 06, C0161 71C0890 07, C0161 71
Brake Pedal Position Sensor SignalC0277 06, C0161 71C0277 06, C0161 71C0277 07, C0161 71C0277 09
Center High Mounted Stop Lamp ControlB3884 0222
Stop Lamp Control - LeftB3881 02B3881 01, B3881 04B3881 01
Stop Lamp Control - RightB3882 02B3882 01, B3882 04B3882 01
Brake Pedal Position Sensor Low ReferenceC0277 07, C0161 711
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
  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 stop lamp control circuit.

DTC B3882 01

The BCM detects a short to voltage in the right stop lamp control circuit.

DTC B3882 02

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

DTC B3882 04

The BCM detects an open/high resistance in the right stop 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.

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, remove the E5AA tail/stop lamp bulb - left. It may take up to 2 minutes for all vehicle systems to power down.
  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 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
  8. Test or replace the E5AA tail/stop lamp - left.

DTC B3882

  1. Ignition OFF, exterior lamps OFF, remove the E5AB tail/stop lamp bulb - right. 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 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 Brake 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
License Plate Lamp ControlB3883 02B3883 01, B3883 04B3883 01, B3883 04
License Plate Lamp GroundB3883 01, B3883 04

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 lamp control circuit.
  2. The BCM detects an open/high resistance in the license lamp ground circuit.

DTC B3883 02

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

DTC B3883 04

  1. The BCM detects an open/high resistance in the license lamp control circuit.
  2. The BCM detects an open/high resistance in the license lamp ground circuit.

DTC B3883 01

License lamp always ON.

DTC B3883 02 or B3883 04

License lamp 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.
  1. Ignition OFF, exterior lamps OFF, remove the E7 license plate lamp bulb. 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 1 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 2 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. Test or replace the E7 license plate lamp bulb.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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
  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.
  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the E6 center high mounted stop lamp. 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. 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 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04
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 - 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 - Left - with T90B3948 01, B3948 04
Turn Signal Repeater Lamp Ground - Right - with T90B3949 01, B3949 04
Turn Signal/Multifunction Switch Ground1
1. Turn Signal Lamps and/or Indicators Malfunction
  1. Battery voltage must be between 9-16 V.
  2. Ignition 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.

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, remove the appropriate E4 turn signal lamp bulb - left front. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4N park/turn signal lamp - left socket terminal C E4Y turn signal repeater lamp - left socket 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. E4N park/turn signal lamp - left socket terminal A E4Y turn signal repeater lamp - left socket 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, remove the E4P turn signal lamp bulb - right front. It may take up to 2 minutes for all vehicle systems to power down.
  5. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4P park/turn signal lamp - right socket terminal C E4Z turn signal repeater lamp - right socket 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. E4P park/turn signal lamp - right socket terminal A E4Z turn signal repeater lamp - right socket 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04
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 - 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 - Left - with T90B3948 01, B3948 04
Turn Signal Repeater Lamp Ground - Right - with T90B3949 01, B3949 04
Turn Signal/Multifunction Switch Ground1
1. Turn Signal Lamps and/or Indicators Malfunction
  1. Battery voltage must be between 9-16 V.
  2. Ignition 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.

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, remove the E4LR turn signal lamp bulb - left rear. It may take up to 2 minutes for all vehicle systems to power down.
  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, remove the E4RR turn signal lamp bulb - right rear. It may take up to 2 minutes for all vehicle systems to power down.
  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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 71C0890 07, C0161 71
Brake Pedal Position Sensor SignalC0277 06, C0161 71C0277 06, C0161 71C0277 07, C0161 71C0277 09
Center High Mounted Stop Lamp ControlB3884 0222
Stop Lamp Control - LeftB3881 02B3881 04B3881 01
Stop Lamp Control - RightB3882 02B3882 04B3882 01
Brake Pedal Position Sensor Low ReferenceC0277 07, C0161 711
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
  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.

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.

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 A - with MX2 Terminal B - with MNG 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 C - with MX2 Terminal A - with MNG 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 B - with MX2 Terminal C - with MNG 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 Active
  6. Install a 3 A fused jumper wire between the appropriate 5 V reference and signal circuit terminals listed below. 5 V reference terminal C and signal terminal B - with MX2 5 V reference terminal A and signal terminal C - with MNG
  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»(ref-544462-S06735997502013042400000) . 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»(ref-544462-S06735997502013042400000) . 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Brake Applied SignalC0297 02C0297 021
1. Cruise Control Malfunction
  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.

  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.

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to «Checking Aftermarket Accessories»(ref-544474-S17151285262013042400000) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

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

  1. «Backup Lamps Malfunction (Automatic Transmission)»(ref-544462-S10016195352013042400000) , «Backup Lamps Malfunction (Manual Transmission)»(ref-544462-S04070160692013042400000)
  2. «Courtesy Lamps Malfunction»(ref-544462-S20350756562013042400000)
  3. «Dome Lamps Malfunction»(ref-544462-S17064958462013042400000)
  4. «Front Fog Lamps Malfunction»(ref-544462-S38411562262013042400000)
  5. «Hazard Lamps Malfunction»(ref-544462-S17954001982013042400000)
  6. «Headlamps Malfunction»(ref-544462-S00764036232013042400000)
  7. «Interior Backlighting Malfunction»(ref-544462-S04927229242013042400000)
  8. «Park, License, and/or Tail Lamps Malfunction»(ref-544462-S05432573282013042400000)
  9. «Rear Compartment Lamp Malfunction»(ref-544462-S24486944962013042400000)
  10. «Stop Lamps Malfunction»(ref-544462-S29214953552013042400000)
  11. «Turn Signal Lamps and/or Indicators Malfunction»(ref-544462-S05981806712013042400000)
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2545 01, B2545 04, B2615 02B2545 01, B2545 04, B2615 02
Backup Lamps ControlB2545 02B2545 01, B2545 04B2545 01
Backup Lamp Ground - Left1
Backup Lamp Ground - Right1
1. Backup Lamps Malfunction

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.

  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, exterior lamps OFF, remove the appropriate E5 backup lamp bulb at the appropriate E42 tail lamp assembly. It may take up to 2 minutes for all vehicle systems to power down.
  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 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 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 E5 backup lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2545 01, B2545 04, B2615 02B2545 01, B2545 04, B2615 02
Backup Lamp Switch Signal (Manual Transmission)P0812P08121
Backup Lamps ControlB2545 02B2545 01, B2545 04B2545 01
Backup Lamp Switch Ground (Manual Transmission)P0812
Backup Lamp Ground - Left1
Backup Lamp Ground - Right1
1. Backup Lamps Malfunction

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.

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 X1 harness connector at the K20 engine 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 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 X1 harness connector at the K20 engine control module. 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, 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, exterior lamps OFF, remove the appropriate E5 backup lamp bulb at the appropriate E42 tail lamp assembly. It may take up to 2 minutes for all vehicle systems to power down.
  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 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
  8. Test or replace the appropriate E5 backup lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2545 01, B2545 04, B2615 02B2545 01, B2545 04, B2615 02
Dome Lamp ControlB2615 0222
Reading Lamp ControlB1480 0211
Dome Lamp Ground1, 2
1. Courtesy Lamps Malfunction 2. Dome Lamps Malfunction
  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the E36AH dome lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground. E36AH dome lamp - terminal 3 with UE1 E36AH dome lamp - terminal 2 without UE1 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. E36AH dome lamp - terminal 1 with UE1 E36AH dome lamp - terminal 4 without UE1
  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 E36AH dome lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F6DA (BCM 6) Fuse B+B2545 01, B2545 04, B2615 02B2545 01, B2545 04, B2615 02
Dome Lamp ControlB2615 0222
Reading Lamp ControlB1480 0211
Dome Lamp Ground1, 2
1. Courtesy Lamps Malfunction 2. Dome Lamps Malfunction
  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the E36AH dome lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the appropriate ground circuit terminal listed below and ground. E36AH dome lamp - terminal 3 with UE1 E36AH dome lamp - terminal 2 without UE1 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. E36AH dome lamp - terminal 2 with UE1 E36AH dome lamp - terminal 3 without UE1
  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 E36AH dome lamp.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F13UA (FRT FOG) Fuse B+11
Front Fog Lamp Switch Signal111
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
Turn Signal/Multifunction Switch Ground1
1. Front Fog Lamps Malfunction

Front Fog Lamp Switch Malfunction

  1. Ignition OFF, 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 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. Ignition ON.
  4. Verify the scan tool Front Fog Lamps Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the X7 harness connector at the K9 body control module. Test for infinite resistance between the signal circuit terminal 8 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 8 and the ground circuit terminal 1.
  6. Verify the scan tool Front Fog Lamps Switch parameter is Active. If not Active Ignition OFF, disconnect the X7 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.

Front Fog Lamps Malfunction

  1. Ignition OFF, disconnect the KR46 front fog lamp relay, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate Replace the X50A fuse block - underhood. If the test lamp illuminates
  3. Verify a test lamp illuminates between the B+ circuit terminal 86 and ground. If the test lamp does not illuminate Replace the X50A fuse block - underhood. If the test lamp illuminates
  4. Ignition OFF, connect a test lamp between the control circuit terminal 85 and B+, ignition ON.
  5. 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 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 Ignition OFF. 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. 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, replace the K9 body control module. If the test lamp turns ON and OFF
  6. Ignition OFF, connect the KR46 front fog lamp relay.
  7. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E29 fog lamp.
  8. 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
  9. Connect a test lamp between the control circuit terminal B and ground, ignition ON.
  10. 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 KR46 front fog lamp relay. 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 KR46 front fog lamp relay. If the test lamp turns ON and OFF
  11. 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 ControlB2652 0222
Hazard Warning Switch Ground1
1. Hazard Lamps Malfunction 2. Hazard Warning Switch Backlighting Malfunction

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 8 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 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
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 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 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 3 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 2 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 02B2580 04B2580 01
Low Beam Headlamp Control - LeftB2575 02B2575 01, B2575 04B2575 04
Low Beam Headlamp Control - RightB2699 02B2699 01, B2699 04B2699 04
High Beam Headlamp Control - Left222
High Beam Headlamp Control - Right222
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 - LeftB2575 04
Headlamp Ground - RightB2699 04
Headlamp Switch Ground1, 3
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

Headlamp 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 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. 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 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 1.
  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 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 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 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 1.
  9. 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 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. Test or replace the S78 Turn Signal/Multifunction 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 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. 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 6 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 6 and the ground circuit terminal 1.
  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 6 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 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 1.
  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 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.

Headlamps Malfunction - Low Beam

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E13 Headlamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. Terminal 1 - with T90 Terminal 2 - without T90 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. Terminal 1 - without T90 Terminal 2 - with T90
  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, remove the KR48 Headlamp High Beam Relay, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate Replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  3. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate Replace the X50A Fuse Block - Underhood. If the test lamp illuminates
  4. Ignition OFF, connect a test lamp between the control circuit terminal 86 and B+, ignition ON.
  5. 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 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 Ignition OFF. 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. 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, replace the K9 Body Control Module. If the test lamp turns ON and OFF
  6. Ignition OFF, exterior lamps OFF, connect the KR48 Headlamp High Beam Relay.
  7. Disconnect the harness connector at the appropriate E13 Headlamp. It may take up to 2 minutes for all vehicle systems to power down.
  8. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. Terminal 1 - with T90 Terminal 2 - without T90 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
  9. Connect a test lamp between the control circuit terminal 3 and ground, ignition ON.
  10. 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 KR48 Headlamp High Beam Relay. 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 KR48 Headlamp High Beam Relay. If the test lamp turns ON and OFF
  11. 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F1DA (BCM 1) Fuse B+B101E 43, B1395 03, B1517 07, C0890 03, U0121 00B101E 43, B1395 03, B1517 07, C0890 03, U0121 00
Instrument Panel Dimmer Switch B+B1395 03, B3600 03B3600 03B1395 07
Instrument Panel Dimmer Switch SignalB1395 03, B3600 03B3600 03B3600 07
Hazard Warning Switch LED Backlight Dimming ControlB2652 0211
LED Backlight Dimming Control Terminal 8 X2B2610 02B2610 04B2610 01
LED Backlight Dimming Control Terminal 5 X1B2625 02B2625 04B2625 01
Instrument Panel Dimmer Switch Low Reference222
Door Lock Switch - Driver Ground1
Door Lock Switch - Passenger Ground1
Hazard Warning Switch - Ground3
Instrument Panel Dimmer Switch Ground1
Seat Heating Switch - Driver Ground1
Seat Heating Switch - Passenger Ground1
Steering Wheel Control Switch - Left Ground1
Steering Wheel Control Switch - Right Ground1
Liftgate Unlatch Switch Ground1
Traction Control Switch Ground1
Transmission Shift Lever Position Indicator Ground1
1. Interior Backlighting Malfunction 2. Dimmer Switch Malfunction 3. Hazard Warning Switch Backlighting Malfunction

Dimmer Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S36 Instrument Panel Dimmer Switch, ignition ON.
  2. Verify a test lamp illuminates between the low reference circuit terminal 2 and B+. If the test lamp does not illuminate 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 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 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. Test for B+ between the B+ reference circuit terminal 1 and ground. If less than B+ Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module. Test for infinite resistance between the B+ 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 B+ 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 B+
  4. Verify a test lamp does not illuminate between the B+ reference circuit terminal 1 and ground. If the test lamp illuminates Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the B+ reference circuit terminal 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 K9 Body Control Module. If the test lamp does not illuminate
  5. Park lamps ON, verify a test lamp does not illuminate between the signal circuit terminal 3 and ground. If the test lamp illuminates 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, replace the K9 Body Control Module. If the test lamp does not illuminate
  6. Ignition ON, park lamps OFF, test for between 57.4 K ohms and 58 K ohms between the signal circuit terminal 3 and ground. If not between 57.4 K ohms and 58 K ohms 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 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 between 57.4 K ohms and 58 K ohms
  7. Test or replace the S36 Instrument Panel Dimmer Switch.

Interior Backlighting Malfunction

  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 listed below and ground. S13D Door Lock Switch - Driver terminal 3 S13P Door Lock Switch - Passenger terminal 3 S36 Instrument Panel Dimmer Switch - terminal 5 S46B Liftgate Unlatch Switch - terminal 6 S32D Seat Heating Switch - Driver terminal 5 S32P Seat Heating Switch - Passenger terminal 5 S70L Steering Wheel Controls Switch - Left terminal 7 S70R Steering Wheel Controls Switch - Right terminal 5 S75 Traction Control Switch - terminal 3 S3 Transmission Shift Lever - terminal 3 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. K33 HVAC control module - terminal 6 X1 S13D Door Lock Switch - Driver terminal 1 S13P Door Lock Switch - Passenger terminal 1 S36 Instrument Panel Dimmer Switch - terminal 4 S46B Liftgate Unlatch Switch - terminal 5 S32D Seat Heating Switch - Driver terminal 6 S32P Seat Heating Switch - Passenger terminal 6 S70L Steering Wheel Controls Switch - Left terminal 6 S70R Steering Wheel Controls Switch - Right terminal 4 S75 Traction Control Switch - terminal 2 S3 Transmission Shift Lever - terminal 8
  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 X2 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 X2 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 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 3 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 2 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.

HVAC Recirculation Indicator Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the K33 HVAC Control Module.
  2. Connect a test lamp between the control circuit terminal 10 and ground.
  3. Verify the test lamp turns ON and OFF while turning the ignition switch ON and OFF. 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 K33 HVAC Control Module.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04
Headlamp Switch Park Lamps ON Signal2B257A 002
License Plate Lamp ControlB3883 02B3883 01, B3883 04B3883 01, B3883 04
Front Park and Rear Tail Lamp Control - LeftB2585 02B2585 01, B2585 04B2585 01, B2585 04
Front Park and Rear Tail Lamp Control - RightB3867 02B3867 01, B3867 04B3867 01, B3867 04
License Plate Lamp Ground1
Park Lamp Ground - Left Front1
Park Lamp Ground - Right Front1
Rear Tail/Stop Lamps Ground - Left1
Rear Tail/Stop Lamps Ground - Right1
Turn Signal/Multifunction Switch Ground2
1. Park, License, and/or Tail Lamps Malfunction 2. Park Lamp Switch Malfunction

When testing at the park lamp bulb sockets, 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.

Park Lamp Switch Malfunction

  1. Ignition OFF, 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 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. 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 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 1.
  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 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.

Park Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate park lamp. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground. E4N park/turn signal lamp - left socket terminal C E4P park/turn signal lamp - right socket terminal C E5AA tail/stop lamp - left rear socket terminal E5AB tail/stop 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. E4N park/turn signal lamp - left socket terminal B E4P park/turn signal lamp - right socket terminal B E5AA tail/stop lamp - left rear socket terminal E5AB tail/stop 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 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 park lamp.

License Plate Lamp Malfunction

  1. Ignition OFF, exterior lamps OFF, remove the E7 license plate lamp bulb. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between each ground circuit terminal 1 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 2 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. Test or replace the E7 license plate lamp bulb.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Rear Compartment Courtesy Lamp ControlB2570 0211
Rear Compartment Courtesy Lamp Ground1
1. Rear Compartment Lamp Malfunction
  1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the E8S rear compartment courtesy lamp. 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. 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) 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 71C0890 07, C0161 71
Brake Pedal Position Sensor SignalC0277 06, C0161 71C0277 06, C0161 71C0277 07, C0161 71C0277 09
Center High Mounted Stop Lamp ControlB3884 0222
Stop Lamp Control - LeftB3881 02B3881 04B3881 01
Stop Lamp Control - RightB3882 02B3882 04B3882 01
Brake Pedal Position Sensor Low ReferenceC0277 07, C0161 711
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

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.

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 A - with MX2 Terminal B - without MNG 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, remove the appropriate E5A Tail/Stop Lamp bulb. 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 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 Brake 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, disconnect the harness connector at the E6 Center High Mounted Stop Lamp. 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. 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 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.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
F5DA (BCM 5) Fuse B+B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04B3867 01, B3867 04, B3881 01, B3881 04, B3949 01, B3949 04, B3950 01, B3950 04
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 - 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 - Left - with T90B3948 01, B3948 04
Turn Signal Repeater Lamp Ground - Right - with T90B3949 01, B3949 04
Turn Signal/Multifunction Switch Ground1
1. Turn Signal/Multifunction Switch Malfunction

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.

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 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. 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 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 1.
  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 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. 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 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
  8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 1.
  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 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
  10. Test or replace the S78 Turn Signal/Multifunction Switch.

Turn Signal Lamps Malfunction

  1. Ignition OFF, exterior lamps OFF, remove the appropriate E4 Turn Signal Lamp bulb. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the appropriate 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 appropriate control circuit at the socket terminal and ground.
  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 bulb.

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.

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