Circuit/System Testing
- Ignition/vehicle OFF, exterior lamps OFF, disconnect the harness connector at the K68 Trailer Lamp Control Module.
- Connect a test lamp between control circuit terminal 11 and ground, ignition ON/vehicle in service mode.
- Verify the test lamp turns ON and OFF when commanding the Center High Mounted Stop Lamp ON and OFF with a scan tool.
- If the test lamp is always OFF
- Test circuit 820 for a short to ground.
- If a short to ground is found, repair the fault on the circuit.
- Go to next step: If a short to ground is not found
- Test circuit 820 for an open/high resistance
- If an open/high resistance is found, repair the fault on the circuit.
- Go to next step: If an open/high resistance is not found.
- Replace the K219 Lighting Control Module.
- If the test lamp is always ON
- Test circuit 820 for a short to voltage.
- If a short to voltage is found, repair the fault on the circuit.
- Go to next step: If a short to voltage is not found.
- Replace the K219 Lighting Control Module.
- Go to next step: If the test lamp turns ON and OFF
- Replace the K68 Trailer Lamp Control Module.
NOTE:
You must perform Circuit/System Verification before Circuit/System Testing
NOTE:
The Center High Mounted Stop Lamp scan tool control function can be found under the K219 Lighting Control Module.