Sunday, October 17, 2021

2010 Cadillac Truck SRX FWD V6-3.0L Page 291

2010 Cadillac Truck SRX FWD 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

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