B1703-15

B1703-15-REAR RIGHT FOG LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN





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

Theory of Operation

The Body Control Module (BCM) receives the input from the headlamp switch requesting fog lamp illumination. The BCM provides a pulse width modulated (PWM) voltage output through the fog lamp driver circuit, which connects to the Fog Lamp. A ground path for the lamps is present through the harness to the body sheet metal. For additional information on the Fog Lamp operation, Exterior Lamps - Operation.

- When Monitored:
With the fog lamps active.

- Set Condition:
When the Body Control Module (BCM) detects a high condition on the (L898) Right Rear Fog Lamp Driver circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn the Fog Lamps on.
4. With the scan tool, read DTCs.

Does the scan tool display DTC: B1703-15-REAR RIGHT FOG LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE (L898) RIGHT REAR FOG LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS




1. Turn the Fog Lamps off.
2. Turn the ignition off.
3. Disconnect the Right Tail Lamp Assembly harness connector.
4. Disconnect the BCM E harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (L898) Right Rear Fog Lamp Driver circuit.

Is there any voltage present?

Yes

- Repair the short to voltage on the (L898) Right Rear Fog Lamp Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK THE (L898) RIGHT REAR FOG LAMP DRIVER CIRCUIT FOR AN OPEN IN THE HARNESS




1. Turn the ignition off.
2. Measure the resistance of the (L898) Right Rear Fog Lamp Driver circuit between the Right Tail Lamp Assembly harness connector and the BCM E harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the open in the (L898) Right Rear Fog Lamp Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (Z922) GROUND CIRCUIT FOR AN OPEN IN THE HARNESS




1. Using a 12-volt test light connected to 12-volts, check the (Z922) Ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open in the (Z922) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. CHECK THE BCM FOR CORRECT OPERATION




1. Reconnect the BCM E harness connector.
2. Connect a 12-volt test light between the (L898) Right Rear Fog Lamp Driver circuit and the (Z922) Ground circuit at the Right Tail Lamp Assembly harness connector.
3. Turn the ignition on.
4. Turn the Fog Lamps on.

Does the test light illuminate brightly?

Yes

- Replace the Right Rear Fog Lamp Bulb or Lamp. Fog Lamp - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Body Control Module (BCM). Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.