2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 388
between the commanded states.
瀚慖f the test lamp is always ON, test the signal circuit for a short to voltage.
瀚慖f the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the K67 trailer brake control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for trailer brake control module replacement,
programming and setup
B0685
DTC B0685
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC B0685 02
- Security System Indicator Circuit Short to Ground
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
* The BCM detects a short to ground on the security indicator control circuit.
* The above condition exist for 1 second.
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 (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Theft
Deterrent System Schematics)
