2010 Cadillac Truck SRX AWD V6-3.0L Page 291

2010 Cadillac Truck SRX AWD V6-3.0L Page 291

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Ignition ON, observe the function of the child security lockout indicator while pressing and depressing the child lockout switch. The child security

lockout indicator should turn ON and OFF each time the child lockout switch is pressed.

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the K9 BCM.

2. Ignition ON, verify that the child security lockout indicator is OFF.

瀚慖f the child security lockout indicator is ON, test the control circuit terminal 6 for a short to ground. If the circuit tests normal, replace the

A20 radio/HVAC control.

3. If all circuits test normal, replace the K9 BCM.

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 BCM and HVAC control replacement, setup and

programming

B256A

DTC B256A

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 B256A 02

- Liftgate Lamp Control Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

When the body control module (BCM) receives a liftgate open signal, the BCM supplies B+ to the cargo lamp control circuit. This will illuminate

the cargo lamp.

Conditions for Running the DTC

* Ignition ON.

* The system voltage is between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground on the cargo lamp control circuit.

Action Taken When the DTC Sets