Security Indicator Malfunction
Security Indicator Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
DTC Descriptors
DTC 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 Fault Information
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.
Reference Information
Schematic Reference
Theft Deterrent System Schematics Theft Deterrent System Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Theft Systems Description and Operation Theft Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module Referencesfor 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 ohm between the ground circuit terminal 6 and ground.
• If 10 ohm or greater
1. Ignition OFF.
2. Test for less than 2 ohm in the ground circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.
• If less than 10 ohm
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
1. Ignition OFF, disconnect the harness connector at the K9 BCM.
2. 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
3. Test for less than 2 ohm in the control circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K9 BCM.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K9 BCM, ignition ON.
2. 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 Verification Tests after completing the repair.
* Sun Load Temperature and Daytime Running Lamp Ambient Light Sensor Replacement Service and Repair
* Control Module References Control Module Referencesfor BCM replacement, programming and setup