DTC B1771: Passenger Side Buckle Switch Circuit Malfunction: Description

WARNING: This page is about a different car, the 2010 Lexus GS 450h. 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 RH.

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

DTC No.	DTC Detection Condition	Trouble Area
B1771	One of following conditions is met: Occupant classification ECU receives line short circuit signal, and open circuit signal, short circuit to ground signal or 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 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.