Pinpoint Test Ad: The Reversing 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.

AD1 CHECK THE BCM CONTROL OF THE REVERSING LAMPS
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: BCM DataLogger.
- Select the BCM reverse lamps active command (RVRS_LMPS). Command the reverse lamps off.
Do the reversing lamps turn off?
- Yes : REFER to AUTOMATIC TRANSMISSION - 6F50/6F55 or AUTOMATIC TRANSAXLE/TRANSMISSION - 6F35 to diagnose a Transmission Range (TR) concern.
- No : GO to AD2 .
AD2 CHECK THE BCM OUTPUT
- Ignition OFF.
- Disconnect: BCM C2280D .
- Ignition ON.
Do the reversing lamps continue to illuminate?
- Yes : GO to AD3 .
- No : GO to AD4.
AD3 CHECK THE AUTO-DIMMING INTERIOR REAR VIEW MIRROR
- Ignition OFF.
- Disconnect: Auto-Dimming Interior Rear View Mirror C911 .
- Ignition ON.
Do the reversing lamps continue to illuminate?
- Yes : GO to AD4 .
- No : INSTALL a new auto-dimming interior rear view mirror. REFER to REAR VIEW MIRRORS . TEST the system for normal operation.
AD4 CHECK FOR CORRECT BCM OPERATION
- 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.