B1664-REAR FOG LAMP CONTROL CIRCUIT HIGH

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

When Monitored:
Continuously.
Set Condition:
The Totally Integrated Power Module (TIPM) Detects a HIGH condition.

Possible Causes
(L239) REAR FOG LAMP CONTROL CIRCUIT OPEN
(L239) REAR FOG LAMP CONTROL CIRCUIT SHORTED TO VOLTAGE
LEFT AND/OR RIGHT REAR FOG LAMP BULBS
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: B1664-REAR FOG LAMP CONTROL CIRCUIT HIGH?

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 AND RIGHT REAR FOG LAMP BULBS

1.	Turn the ignition off.

2.	Remove the Left and Right Fog Lamp Bulbs.

3.	Inspect the Left and Right Fog Lamp Bulbs.

Are the inoperative bulbs OK?

Yes

Replace the Inoperative bulb(s) 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. (L239) REAR FOG LAMP CONTROL CIRCUIT OPEN

1.	Disconnect the TIPM C6 harness connector.

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

3.	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

Repair the (L239) Rear Fog Lamp Control circuit for an open.
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 SHORTED TO VOLTAGE

1.	Turn the ignition on.

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

Is there any voltage present?

Yes

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

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).