Front Fog Relay Circuit High

FRONT FOG RELAY CIRCUIT HIGH

Front Fog Relay Circuit High:

WHEN MONITORED
With the ignition on.

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
- Missing relay
- Open fuse
- Fog lamp relay
- Body control module
- Fog lamp relay control circuit open

DIAGNOSTIC TEST

1. INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all BCM DTC's.
Turn the Fog Lamps on.
With the Scan Tool, read the DTC information.

Q: Does the Scan Tool read: FRONT FOG RELAY CKT HIGH?

YES: Go To 2
NO: The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. MISSING RELAY
Turn the ignition off.
Check the Junction Block to make certain the Fog Lamp Relay is present.

Q: Is the Fog Lamp Relay present?

YES: Go To 3
NO: Replace the missing Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. OPEN FUSE
Turn the ignition off.
Check Junction Block fuse 19.

Q: Is the fuse open?

YES: Replace the open fuse.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 4

4. FOG LAMP RELAY
Turn the ignition off.
Install a known good relay in place of the fog lamp relay.
Turn the Fog Lamps On.

Q: Do the Fog Lamps operate normally?

YES: Replace the Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

5. BODY CONTROL MODULE




Turn the ignition off.
Remove the Fog Lamp Relay.
Measure the voltage of the Fused B+ circuit of the fog lamp relay.

Q: Is the voltage above 10 volts?

YES: Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the Fog Lamp Relay Control Circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test