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Theft Deterrent System Buick Regal V

Door Locks & Anti-Theft Systems 2 illustrations ~2876 words

Scheme 37

Scheme 37: Theft Deterrent System Wiring Schematics
Scheme 37: Theft Deterrent System Wiring Schematics

Diagnostic Code Index

DTCDescription
DTC B0685DTC B0685 01 Security System Indicator Circuit Short to Battery DTC B0685 02 Security System Indicator Circuit Short to Ground DTC B0685 04 Security System Indicator Circuit Open

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlB0685 02B0685 04B0685 01
Low ReferenceB0685 04

Circuit/System Description

The security LED is controlled by the body control module (BCM) based on commands from the content theft deterrent system. The security LED is located in the dash as part of the ambient light sensor and is supplied ground at all times. When the content theft deterrent system requests the LED be commanded ON, the BCM applies voltage to the security indicator control circuit, illuminating the LED.

Conditions for Running the DTC

The system voltage is between 9-16 V.

Conditions for Setting the DTC

B0685 01

The BCM detects a short to voltage on the security indicator control circuit.

B0685 02

The BCM detects a short to ground on the security indicator control circuit.

B0685 04

The BCM detects an open on the security indicator control circuit.

Action Taken When the DTC Sets

Security LED output is disabled

Conditions for Clearing the DTC

  1. A current DTC is cleared when the conditions for setting the DTC are no longer present.
  2. A history DTC will clear after 40 malfunction free ignition cycles.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Arm the content theft deterrent system. The security LED should illuminate and/or flash during the arming sequence.

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B10B ambient light/sunload sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 6 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Ignition ON, connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 6.
  4. Verify the test lamp turns ON and OFF when commanding the security indicator ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K9 BCM. 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 BCM. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K9 BCM, 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 BCM. If the test lamp turns ON and OFF
  5. Test or replace the B10B ambient light/sunload sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Automatic Control Ambient Light Sensor Replacement»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

Symptoms - Theft Deterrent

Note. The following steps must be completed before using the symptom tables.

  1. Perform «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following «Theft Systems Description and Operation»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#theft-deterrent-system__theft-systems-description-and-operation) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the Theft Deterrent System. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

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

  1. «Content Theft Deterrent Malfunction»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#theft-deterrent-system)
  2. «Security Indicator Malfunction»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#theft-deterrent-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The content theft deterrent system is a software based system in which the body control module (BCM) actively monitors certain inputs to determine if unauthorized vehicle access is being attempted. Based on inputs such as the door ajar switches, the rear compartment ajar switch, and the hood ajar switch, the BCM determines whether a content theft deterrent alarm is warranted. If unauthorized access is being detected, the BCM will pulse the vehicle horn and flash the exterior lamps as a means of theft deterrence.

Diagnostic Aids

The scan tool BCM Content Theft Deterrent Trigger History 1, 2, and 3 parameters can be used to help isolate an intermittent unwanted content theft deterrent alarm. These parameters are a rolling history of the previous three causes of a theft deterrent alarm. If all three parameters are indicating the same alarm trigger, the indicated input should be the starting point when diagnosing an intermittent concern.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify each indicator/message transition between the ajar and closed state while opening and closing each vehicle door, hood, and rear compartment. If the indicator/message does not change Refer to «Hood Ajar Indicator/Message Malfunction»(/buick/regal/v-2009-2013/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) ,, «Door Ajar Indicator Malfunction»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) , or «Trunk Ajar Indicator Malfunction»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) . If each indicator/message changes
  3. Completely lower the driver door window and close all vehicle doors, ignition OFF.
  4. Arm the content theft deterrent system by locking the doors with the keyless entry transmitter.
  5. Verify the scan tool BCM Content Theft Deterrent Alarm Status parameter is Armed. If not Armed Refer to «Keyless Entry System Malfunction (Passive)»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#keyless-entry-system-and-remote-functions) , «Keyless Entry System Malfunction (Active)»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#keyless-entry-system-and-remote-functions) . If Armed
  6. Without disarming the system, reach in through the open driver window and open the driver door.
  7. Verify the scan tool BCM Content Theft Deterrent Alarm Status parameter is Alarm. If not Alarm Replace the K9 body control module. If Alarm
  8. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlB0685 02B0685 04B0685 01
Low ReferenceB0685 04

The security LED is controlled by the body control module (BCM) based on commands from the content theft deterrent system. The security LED is located in the dash as part of the ambient light sensor and is supplied ground at all times. When the content theft deterrent system requests the LED be commanded ON, the BCM applies voltage to the security indicator control circuit, illuminating the LED.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Arm the content theft deterrent system. The security LED should illuminate and/or flash during the arming sequence.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B10B ambient light/sunload sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the ground circuit terminal 6 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Ignition ON, connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 6.
  4. Verify the test lamp turns ON and OFF when commanding the security indicator ON and OFF with a scan tool. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K9 BCM. 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 BCM. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K9 BCM, 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 BCM. If the test lamp turns ON and OFF
  5. Test or replace the B10B ambient light/sunload sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Headlamp Automatic Control Ambient Light Sensor Replacement»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

Scheme 38

Scheme 38: Theft Deterrent Module Replacement
Scheme 38: Theft Deterrent Module Replacement
CalloutComponent Name
Preliminary Procedure Remove the lower steering column trim cover. Refer to Steering Column Trim Cover Replacement .
1Theft Deterrent Module Fastener (Qty: 2) Procedure Disconnect the electrical connector.
2Theft Deterrent Module Procedure Release the theft deterrent module from the ignition switch.

Theft Deterrent Module Replacement

Theft Systems Description and Operation

When armed, the content theft deterrent system is designed to deter vehicle content theft by pulsing the horns and exterior lamps for approximately 30 seconds when an unauthorized vehicle entry is detected. However, the content theft deterrent system does not affect engine starting.

An unauthorized entry can be any of the following with the content theft deterrent system armed

  1. Unauthorized entry into the underhood area
  2. Unauthorized entry into the rear compartment
  3. When any door is opened without using the UNLOCK command from a keyless entry transmitter
  4. After a battery reconnect, if the battery was disconnected with the content theft deterrent system armed

The components of the content theft deterrent system are

  1. Body Control Module (BCM)
  2. Keyless entry control module (RPO ATH)
  3. Remote control door lock receiver
  4. Security indicator
  5. Door ajar switches
  6. Rear compartment ajar switch
  7. Hood ajar switch

Use the following procedure in order to arm the system

  1. Place the shift lever in P (park).
  2. Turn OFF the ignition.
  3. Open any door.
  4. Lock the doors with the power door lock switch or by pressing the LOCK button on the transmitter. The system is in standby mode and will not start the arming timer until all doors are closed.
  5. The system will begin the arm sequence immediately after the last door is closed. If the keyless entry transmitter is used the arm the system after the vehicle doors are closed, the arm sequence will begin as soon as the LOCK command is received by the transmitter.
  6. Pressing the LOCK button on the keyless entry transmitter a second time will bypass the delayed arming function and force the system to arm.

Locking the vehicle may be accomplished without arming the content theft deterrent system. Use of the manual door locks will lock the vehicle, but will not arm the content theft deterrent system.

Disarming an Armed System/Silencing an Alarm

If system arming has been requested by the power door lock switch or the keyless entry transmitter, it must be disarmed.

Note. Disconnecting the battery or removing fuses does not disable the arm or alarm modes, since the BCM stores the content theft deterrent mode status in memory.

  1. To disarm the content theft deterrent system in standby mode, perform one of the following: Press the UNLOCK button on the keyless entry transmitter. Approach the vehicle with a valid keyless entry transmitter and pull the vehicle door handle (RPO ATH). Insert a valid key into the ignition and switch to the ON position.
  2. To disarm the content theft deterrent system in the armed mode (non-event) or when activated (during an alarm event): Press the UNLOCK button on the keyless entry transmitter. Insert a valid key into the ignition and switch to the ON position

Content Theft Deterrent Circuit Description

The following is a description of each component used in the content theft deterrent system

Body Control Module

The content theft deterrent system is an internal function of the BCM which utilizes serial data and various switch inputs information to perform content theft deterrent functions. When the BCM detects an unauthorized entry, it activates the horns and exterior lamps. The BCM has 4 basic modes (disarmed, standby, armed, and alarm) for operating the content theft deterrent system. The different modes are described below.

  1. The BCM has the content theft deterrent system in a disarmed mode until the following conditions are detected: Ignition key turned to the OFF position. Doors locked by either the power door lock switch or the LOCK button on the transmitter.
  2. The BCM enters the standby mode when the above conditions are detected. If a door was already opened when the arm mode was requested, the standby mode does not start the timer until the last door is closed.
  3. When the last door is closed, a 15 second timer is activated. Once the timer has expired, the BCM enters the armed mode. After this delay, any unauthorized entry will activate the alarm mode.
  4. When the BCM detects an unauthorized entry, the BCM enters the alarm mode. The BCM activates the horns and exterior lamps for 30 seconds. This is followed by a three minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.

Keyless Entry Control Module (RPO ATH)

The passive keyless entry system can arm and disarm the content theft deterrent system. When a valid keyless entry transmitter is detected while attempting to passively access the vehicle, the keyless entry module will send a message via serial data to disarm the content theft deterrent system.

Remote Control Door Lock Receiver

The keyless entry system can arm and disarm the content theft deterrent system. When the remote control door lock receiver receives a door lock or unlock signal from the transmitter, the remote control door lock receiver sends a message to the BCM via serial data to perform the appropriate arm/disarm functions.

Security Indicator

The security LED is illuminated on the upper I/P by the BCM. The content theft deterrent system uses the security LED to inform the driver of system status prior to arming.

Door Ajar Switches

The content theft deterrent system uses the door ajar switches as a status indicator to activate the alarm. The door ajar switches are monitored by the body control module via a discrete input from each door ajar switch. If the BCM receives a signal indicating a door is opened when the content theft deterrent system is armed, the BCM activates the alarm.

Hood Ajar Switch

The content theft deterrent system uses the hood ajar switch as a status indicator to activate the alarm. The BCM monitors the hood ajar switch via a discrete input from the switch. If the BCM receives a signal indicating the hood has been opened when the content theft deterrent system is armed, the BCM activates the alarm.

Rear Compartment Ajar Switch

The content theft deterrent system uses the rear compartment ajar switch as a status indicator to activate the alarm. The BCM monitors the rear compartment ajar switch via a discrete input from the switch. If the BCM receives a signal indicating the rear compartment has been opened when content theft deterrent system is armed, the BCM activates the alarm.

Inputs

The BCM monitors the following inputs for content theft deterrent

  1. The door ajar switches
  2. The keyless entry transmitter LOCK/UNLOCK buttons; a message from the remote control door lock receiver
  3. The immobilizer status-The BCM uses the immobilizer status for disarming the system or silencing an alarm when the correct vehicle key is used to start the vehicle
  4. The rear compartment ajar switch
  5. The hood ajar switch

Outputs

The BCM controls the following for content theft deterrent

  1. The horn relay
  2. The exterior lamps

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