Tuesday, June 18, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 639


Circuit/System Verification



Command the Lock Rear Doors and Unlock Rear Doors with a scan tool, the rear doors should perform the LOCK and UNLOCK function.



Circuit/System Testing



1. Ignition OFF, disconnect the X3 harness connector at the I/P fuse block.



2. Connect a test lamp between the control circuit terminal A2 and ground.



3. Ignition ON, command the Lock Rear Doors with a scan tool. The test lamp should briefly illuminate during the LOCK command.



锟斤拷 If 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 BCM.



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



4. Connect a test lamp between the control circuit terminal A3 and B+.



5. Command the Unlock Rear Doors with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.



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



the BCM.



锟斤拷 If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.



6. If all circuits test normal, replace the I/P fuse block.



Repair Instructions



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



* Instrument Panel Electrical Center or Junction Block Replacement - Left Side (See: Maintenance/Fuses and Circuit Breakers/Fuse



Block/Service and Repair/Removal and Replacement/Instrument Panel Electrical Center or Junction Block Replacement - Left Side)



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



B3135



DTC B3130 or B3135



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 B3130 00



- All Door Unlock Circuit



DTC B3135 00



- All Door Lock Circuit



Diagnostic Fault Information

No comments:

Post a Comment