2010 Cadillac Truck SRX FWD V6-3.0L Page 388

2010 Cadillac Truck SRX FWD V6-3.0L 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)