B1663-REAR FOG LAMP CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the Rear Fog Lamps activated.
Set Condition:
The Totally Integrated Power Module (TIPM) Detects a LOW condition.

Possible Causes
(L239) REAR FOG LAMP CONTROL CIRCUIT SHORT TO GROUND
LEFT REAR FOG LAMP BULB
RIGHT REAR FOG LAMP BULB
TOTALLY INTEGRATED POWER MODULE

1. INTERMITTENT CONDITION

1.	Turn the ignition on.

2.	With the scan tool, clear all DTCs.

3.	Turn the Rear Fog Lamps on.

4.	With the scan tool, read DTCs.

Does the scan tool display active: B1663-REAR FOG LAMP CONTROL CIRCUIT LOW?

Yes

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.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

2. LEFT REAR FOG LAMP BULB

1.	Turn the ignition off.

2.	Disconnect the Left Rear Fog Lamp Bulb.

3.	Turn the ignition on.

4.	With the scan tool, read DTCs.

Does the DTC reset?

Yes

Replace the Left Rear Fog Lamp Bulb in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

3. RIGHT REAR FOG LAMP BULB

1.	Turn the ignition off.

2.	Disconnect the Right Rear Fog Lamp Bulb.

3.	Turn the ignition on.

4.	With the scan tool, read DTCs.

Does the DTC reset?

Yes

Replace the Right Rear Fog Lamp Bulb in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

4. (L239) REAR FOG LAMP CONTROL CIRCUIT SHORT TO GROUND

1.	Turn the ignition off.

2.	Disconnect the TIPM C6 harness connector.

3.	Disconnect the Left and Right Rear Fog Lamp harness connectors.

4.	Measure the resistance between ground and the (L239) Rear Fog Lamp Control circuit.

Is the resistance above 10k Ohms?

Yes

Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Repair the (L239) Rear Fog Lamp Control circuit for a short to ground.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).