B0685
DTC B0685
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 Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0685 01
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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.
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
* A current DTC is cleared when the conditions for setting the DTC are no longer present.
* A history DTC will clear after 40 malfunction free ignition cycles.
Reference Information
Schematic Reference
Theft Deterrent System Schematics Theft Deterrent System Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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 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
1. Ignition OFF.
2. 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
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 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
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.
* Headlamp Automatic Control Ambient Light Sensor Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, programming and setup