Sunday, March 14, 2021

2010 Cadillac CTS Sedan AWD V6-3.6L Page 509

2010 Cadillac CTS Sedan AWD V6-3.6L Page 509



circuit. This energizes the park lamp relay coil causing the relay switch contacts to close allowing battery voltage to flow through the LT/POS/LP



and RT/POS/LP fuses to all of the park, tail, license, and marker lamps.



Conditions for Running the DTC



* Battery voltage must be between 9-16 V.



* Park lamps ON.



Conditions for Setting the DTC



The BCM detects a short to voltage in the park lamp relay control circuit.



Actions Taken When the DTC Sets



The park lamps will not operate.



Conditions for Clearing the DTC



* The condition responsible for setting the DTC no longer exists.



* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.



Reference Information



Schematic Reference



Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)



Connector End View Reference



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



Description and Operation



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



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)



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



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



Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)



Scan Tool Reference



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



Circuit/System Testing



1. Ignition OFF, disconnect the LT/POS/LP relay.



2. Ignition ON, verify a test lamp does not illuminate between the control circuit terminal 87 and ground.



瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.



3. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.



瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the



B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the LT/POS/LP



relay.



4. Verify a test lamp illuminates between the B+ circuit terminal 85 and ground.



瀚慖f the test lamp does not illuminate, test the B+ circuit for an open/high resistance.



5. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.



6. Command the Parking Lamps 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 ground. If the circuit tests normal, replace the BCM.



瀚慖f 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.



7. If all circuits test normal, replace the LT/POS/LP relay.

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