Diagnostic Test

1) INTERMITTENT CONDITION
Turn the ignition on.

With the scan tool, clear all BCM DTC's.

Turn the Park Lamps on.

With the scan tool, read the DTC information.

Does the scan tool read: PARK LAMP RELAY CKT LOW?

Yes
1. Go to step 2).
No
1. The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
2. Perform BODY VERIFICATION TEST .
2) PARK LAMP RELAY SHORT TO GROUND
Turn the ignition off.

Disconnect the Park Lamp Relay.

Measure the resistance between ground and the Park Lamp Relay Control circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the Park lamp Relay Control circuit for a short to ground.
2. Perform BODY VERIFICATION TEST .
No
1. Go to step 3).
3) PARK LAMP RELAY
Turn the ignition off.

Disconnect the Park Lamp Relay harness connector.

Measure the voltage of the Park Lamp Relay harness connector coil side feed circuit to ground.

Is the voltage above 10.0 volts?

Yes
1. Replace the Park Lamp Relay.
2. Perform BODY VERIFICATION TEST .
No
1. Replace the Body Control Module.
2. Perform BODY VERIFICATION TEST .