DTC B1771 Passenger Side Buckle Switch Circuit Malfunction: Description

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt assembly RH

DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.

DTC DETECTION CONDITION CHART

DTC No	DTC Detecting Condition	Trouble Area
B1771	The occupant classification ECU receives a line short circuit signal, open circuit signal and short circuit to ground signal or a short circuit to B+ signal in passenger side buckle switch circuit for 2 seconds Passenger side buckle switch malfunction Occupant classification ECU malfunction	Front seat wire RH Front seat inner belt assembly RH (Passenger side buckle switch) Occupant classification ECU

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, check the DTCs stored in the occupant classification ECU. When DTC B1771 is output, perform troubleshooting for the DTC