Circuit description

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

The passenger's seat buckle switch circuit consists of the occupant detection ECM and the front seat inner belt ASSY RH.

If any fault is found in the passenger's seat buckle switch circuit, the diagnostic code B1771 will be recorded.

DTC No.	DTC detected item	Faulty part
B1771	Occupant detection ECM receives short circuit line signal, open circuit signal, short to ground signal, or short to B+ signal in passenger's seat buckle switch circuit. Passenger's seat buckle switch is faulty. Occupant detection ECM is faulty.	Front seat inner belt ASSY RH (passenger's seat belt buckle switch) Front seat ASSY RH Front seat cushion ASSY RH

NOTE: In the case that the diagnostic code B1650 is detected as a result of troubleshooting of the air bag system, check the diagnostic code recorded in the occupant detection ECM. In the case that the diagnostic code B1771 is output, perform the troubleshooting procedures for this diagnostic code.