Wednesday, November 11, 2020

2010 Cadillac Truck SRX AWD V6-3.0L Page 571

2010 Cadillac Truck SRX AWD V6-3.0L Page 571



Ignition ON, command the Rear Fog Lamp(s) Relay ON and OFF with a scan tool. The rear fog lamp should turn ON and OFF when changing



between the commanded states.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the E5 fog lamp-rear.



2. Test for less than 30 ohm between the ground circuit terminal C and ground.



瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.



3. Connect a test lamp between the control circuit terminal A and ground.



4. Ignition ON, command the Rear Fog Lamp(s) Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing



between the commanded states.



瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.



瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace



the K9 BCM.



5. If all circuits test normal, replace the E5 fog lamp-rear.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Tail Lamp Replacement (See: Lighting and Horns/Tail Lamp/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup and programming



B2545



DTC B2545



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 Descriptors



DTC B2545 01



- Backup Lamps Circuit Short to Battery



DTC B2545 02



- Backup Lamps Circuit Short to Ground



DTC B2545 04



- Backup Lamps Circuit Open



Diagnostic Fault Information



Circuit/System Description



When the engine is running and the transmission is placed in reverse gear, the transmission control module sends a serial data message to the body



control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup



lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the transmission control module via serial data

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