Diagnostic Test

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 HIGH? 

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 .

Turn the ignition off.

Check the Junction Block to make certain the Park Lamp Relay is present.

Is the Park Lamp Relay present? 

Yes 

1. Go to step  3).

No 

1. Replace the missing Park Lamp Relay.
2. Perform BODY VERIFICATION TEST .

Turn the ignition off.

Check the Junction Block Park Lamp fuses 23 and 9.

Are any of the fuses open? 

Yes 

1. Replace the open fuse.
2. Perform BODY VERIFICATION TEST .

No 

1. Go to step  4).

Turn the ignition off.

Install a known good relay in place of the Park Lamp Relay.

Turn the Park Lamps On.

Do the Park Lamps operate normally? 

Yes 

1. Replace the Park Lamp Relay.
2. Perform BODY VERIFICATION TEST .

No 

1. Go to step  5).

Turn the ignition off.

Remove the Park Lamp Relay.

Measure the voltage of the Fused B+ circuit of the Park Lamp Relay.

Is the voltage above 10 volts? 

Yes 

1. Replace the Body Control Module.
2. Perform BODY VERIFICATION TEST .

No 

1. Repair the Fused Park Lamp Relay Output circuit for an open condition.
2. Perform BODY VERIFICATION TEST .