Front Fog Relay Circuit High

Monitored & Set Condition

1. When Monitored: With ignition On.
2. Set Condition: BCM detects battery on the Front Fog Relay when it is attempting to turn on the Front Fog Lamps for more than 5 seconds. The BCM learns that the Front Fog Options exists on a vehicle when it detects a ground on the Front Fog Switch Input circuit.

Possible Causes:

• Intermittent Condition
• Missing Relay
• Open Fuse
• Fog Lamp Relay
• Body Control Module
• Fog Lamp Relay Control Circuit Open

Testing

1. Turn the ignition on. With the DRBIII(R), clear all BCM DTC's. Turn the Fog Lamps on. With the DRBIII(R), read the DTC information. Does the DRBIII(R) read: FRONT FOG RELAY CKT HIGH? If yes, go to next step. If no, the condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires. Perform BODY VERIFICATION TEST  .
2. Turn the ignition off. Check the Junction Block to make certain the Fog Lamp Relay is present. Is the Fog Lamp Relay present? If yes, go to next step. If no, replace the missing Fog Lamp Relay. Perform BODY VERIFICATION TEST  .
3. Turn the ignition off. Check Junction Block fuse No. 19. Is the fuse open? If yes, replace the open fuse. Perform BODY VERIFICATION TEST  . If no, go to next step.
4. Turn the ignition off. Install a known-good relay in place of the fog lamp relay. Turn the Fog Lamps On. Do the Fog Lamps operate normally? If yes, replace the Fog Lamp Relay. Perform BODY VERIFICATION TEST  . If no, go to next 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? If yes, replace the Body Control Module. Perform BODY VERIFICATION TEST  . If no, repair the Fog Lamp Relay Control Circuit for an open condition. Perform BODY VERIFICATION TEST  .