REAR FOG RELAY CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W


  • When Monitored:

    With the ignition on.

  • Set Condition:

    BCM detects battery on the Rear Fog Relay when it is attempting to turn on the Front Fog Lamps for more than 5 seconds. The BCM is programmed per Country Code whether or not a vehicle is equipped with a Rear Fog Relay.


Possible Causes
  
MISSING RELAY
  
OPEN FUSE
  
FOG LAMP RELAY
  
BODY CONTROL MODULE
  
FOG LAMP RELAY CONTROL CIRCUIT OPEN
  



Diagnostic Test

1.INTERMITTENT CONDITION






Does the scan tool read: REAR FOG RELAY CIRCUIT HIGH?

Yes
  • Go To2


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.

2.MISSING RELAY




Is the Rear Fog Lamp Relay present?

Yes
  • Go To3


No
  • Replace the missing Fog Lamp Relay.
  • Perform BODY VERIFICATION TEST - VER 1.

3.OPEN FUSE




Is the fuse open?

Yes
  • Replace the open fuse.
  • Perform BODY VERIFICATION TEST - VER 1.


No
  • Go To4

4.FOG LAMP RELAY





Do the Rear Fog Lamps operate normally?

Yes
  • Replace the Fog Lamp Relay.
  • Perform BODY VERIFICATION TEST - VER 1.


No
  • Go To5

5.BODY CONTROL MODULE





Is the voltage above 10 volts?

Yes
  • Replace the Body Control Module.
  • Perform BODY VERIFICATION TEST - VER 1.


No
  • Repair the Fog Lamp Relay Control Circuit for an open condition.
  • Perform BODY VERIFICATION TEST - VER 1.