Normal Operation and Fault Conditions

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.

The RCM continuously monitors the second row left seatbelt buckle switch circuits for the following faults:

Open circuit
Short to voltage
Short to ground
Current out of range
Faulted second row left seatbelt buckle switch
If a fault is detected, the RCM stores DTC B140D:11, B140D:12, B140D:13 or B140D:1D in memory and sends a message to the IPC to illuminate the airbag warning indicator.

PPT V RCM DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
B140D:11	Second Row Passenger Side Seatbelt Sensor: Circuit Short to Ground	Sets when the RCM senses a short to ground from the second row right seatbelt buckle switch circuit for more than 6 seconds.
B140D:12	Second Row Passenger Side Seatbelt Sensor: Circuit Short to Battery	Sets when the RCM senses a short to voltage from the second row right seatbelt buckle switch circuit for more than 6 seconds.
B140D:13	Second Row Passenger Side Seatbelt Sensor: Circuit Open	Sets when the RCM senses an open from either second row right seatbelt buckle switch circuit for more than 6 seconds.
B140D:1D	Second Row Passenger Side Seatbelt Sensor: Circuit Current Out of Range	Sets when the RCM measures current outside of an acceptable range from the second row right seatbelt buckle switch circuit for more than 6 seconds.