Diagnostic Test

Turn the ignition on.

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

Turn the Fog Lamps on.

With the scan tool, read the DTC information.

Does the scan tool read: REAR FOG RELAY CIRCUIT 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 Rear Fog Lamp Relay is present.

Is the Rear Fog Lamp Relay present? 

Yes 

1. Go to step  3).

No 

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

Turn the ignition off.

Check Junction Block fuse 2.

Is the fuse 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 Rear Fog Lamp Relay.

Turn the Fog Lamps On.

Do the Rear Fog Lamps operate normally? 

Yes 

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

No 

1. Go to step  5).

Turn the ignition off.

Remove the Fog Lamp Relay.

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

Is the voltage above 10 volts? 

Yes 

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

No 

1. Repair the Fog Lamp Relay Control Circuit for an open condition.
2. Perform BODY VERIFICATION TEST .