Pinpoint Test B : The Reversing 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.

B1 CHECK THE TCM (TRANSMISSION CONTROL MODULE) TRANSMISSION RANGE PID (PARAMETER IDENTIFICATION)
- Apply the parking brake.
- Ignition ON.
- Using a diagnostic scan tool, view TCM Parameter Identifications (PIDs).
- Monitor the TR_CORRECTED PID.
- Place the gear selector lever in each position.
Does the PID indicate reverse when the gear selector is not in reverse?

Yes DIAGNOSE the transmission range concern. REFER to: External Controls .

No GO to B2

B2 CHECK THE REVERSING LAMPS SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: BCM C2280C .
- Ignition ON.
Does either reversing lamp continue to illuminate?

Yes REPAIR the affected circuit.

No GO to B3

B3 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.