Wednesday, December 4, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 597


Conditions for Setting the DTC



The BCM receives a ground signal on the LED indicator dimming supply circuit.



Action Taken When the DTC Sets



The BCM cease attempt to dim or illuminate the LED indicator lamps.



Conditions for Clearing the DTC



* The conditions for setting the DTC are no longer present.



* A history DTC clears after 100 malfunction-free ignition cycles.



* The BCM receives the clear code command from the scan tool.



Reference Information



Schematic Reference



Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming Schematics



)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



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



Circuit/System Testing



Note: Each LED dimming lighting component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to



identify the following:



* LED dimming lighting components the vehicle is equipped with.



* Component locations on the LED dimming control circuit



* Each component's control and ground circuit terminals



1. Ignition OFF, disconnect the harness connector at any component with inoperative LED dimming lighting.



2. Ignition OFF, scan tool disconnected, interior lamps OFF, doors CLOSED, test for less than 5 ohm between the ground circuit and ground.



锟斤拷 If greater than the specified value, test the ground circuit for an open/high resistance.



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



4. Command the LED Dimming Control ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the



commanded states.



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.



5. If all circuits test normal, replace the component with the inoperative LED dimming lighting.



Repair Instructions



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

No comments:

Post a Comment