Pinpoint Test Aa: The Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

AA1 CHECK THE FOG LAMP SWITCH PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: FLM DataLogger.
- Monitor the FLM fog lamp switch PID (FOG_F_SW) while pressing and releasing the fog lamp switch.
Does the PID indicate the fog lamp switch is active when pressed and inactive when released?
- Yes : GO to AA2 .
- No : INSTALL a new FLM . REFER to FRONT LIGHTING CONTROL MODULE (FLM) . TEST the system for normal operation.
AA2 CHECK THE BCM FOG LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: BCM C2280E .
- Ignition ON.
Do the fog lamps continue to illuminate?
- Yes : REPAIR circuit CLF12 (BN/YE) for a short to voltage. TEST the system for normal operation.
- No : GO to AA3 .
AA3 CHECK FOR CORRECT BCM OPERATION
- Ignition OFF.
- Disconnect all the BCM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the BCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
- Yes : INSTALL a new BCM . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.