Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Outlook. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the parklamp relay.
Ignition ON, verify the parklamp is deactivated.
- If the parklamp is still activated, repair the relay switch control circuit terminal 87 for a short to voltage.
Verify that a test lamp illuminates between the relay coil voltage supply circuit terminal 85 and ground.
- If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the voltage supply circuit fuse is open, test the relay switch control circuit for a short to ground. If the circuit tests normal, test or replace the parklamp relay.
Connect a 10-amp fused jumper wire between the relay switch voltage supply circuit terminal 30 and the relay switch control circuit. Verify the park lamps are activated.
- If the park lamps are not activated, test the relay switch control circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
Connect a test lamp between the relay coil control circuit terminal 86 and the relay coil voltage supply circuit terminal 85.
Command the parklamp relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp remains ON all the time, test for a short to ground on the relay coil control circuit terminal 86. If the circuit tests normal, replace the BCM.
- If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the relay coil control circuit terminal 86. If the circuit tests normal, replace the BCM.
If all circuits test normal, test or replace the parklamp relay.