Pinpoint Test F : The Rear Fog Lamps Are On Continuously
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- F1 CHECK THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205 .
- Carry out the headlamp switch component test. Refer to Wiring Diagram Component Testing for schematic and connector information.
Does the headlamp switch pass the component test?
Yes GO to F2 No INSTALL a new headlamp switch. REFER to: Headlamp Switch . - F2 CHECK THE REAR FOG LAMP SWITCH CIRCUIT FOR A SHORT TO GROUND
- Disconnect: BCM C2280B .
- Measure:
Positive Lead Measurement / Action Negative Lead C205-2 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to F3 No REPAIR the circuit. - F3 CHECK THE REAR FOG LAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: BCM C2280C .
- Ignition ON.
Do the rear fog lamps continue to illuminate?
Yes REPAIR the circuit. No GO to F4 - F4 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
- Disconnect and inspect all BCM and all related in-line connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the BCM and all related in-line connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, BCM guided routine is not applicable for this vehicle and market. Replace the component that was faulted through service information diagnosis. No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.