Diagnostic Test

Turn the ignition on.

With the scan tool, clear all DTC's.

Turn the Rear Fog Lamps on.

With the scan tool, read DTC's.

Does the scan tool display active: B1664-REAR FOG LAMP CONTROL CIRCUIT HIGH? 

Yes 

1. Go to  2).

No 

1. The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
2. Perform BODY VERIFICATION TEST - VER 1 .

Turn the ignition off.

Remove the Left and Right Fog Lamp Bulbs.

Inspect the Left and Right Fog Lamp Bulbs.

Are the inoperative bulbs OK? 

Yes 

1. Go to  3).

No 

1. Replace the Inoperative bulb(s) in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .

Disconnect the TIPM C6 harness connector.

Disconnect the Left and Right Rear Fog Lamp harness connectors.

Measure the resistance of the (L239) Rear Fog Lamp Control circuit between the Left and Right Rear Fog Lamp harness connectors and the TIPM C6 harness connector.

Is the resistance below 10.0 ohms? 

Yes 

1. Go to  4).

No 

1. Repair the (L239) Rear Fog Lamp Control circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .

Turn the ignition on.

Measure for voltage on the (L239) Rear Fog Lamp Control circuit.

Is there any voltage present? 

Yes 

1. Repair the (L239) Rear Fog Lamp Control circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .

No 

1. Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .