B1771: Passenger Side Buckle Switch Circuit Malfunction: Description

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. 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 buckle switch RH.

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

DIAGNOSTIC TROUBLE CODE TABLE

DTC No.	DTC Detection Condition	Trouble Area
B1771	When one of following conditions met: Occupant classification ECU detects line short circuit signal, 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	No. 1 seat wire Front seat inner belt RH (Buckle switch RH) Occupant classification ECU

NOTE: Replace the occupant classification ECU, occupant classification sensor, seat cushion cover pad, seat cushion cover and seat cushion seat heater as a 5 part set (see supply set part no.).

HINT:

When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, check the DTCs stored in the occupant classification ECU, and perform troubleshooting for those DTCs first.
Use the intelligent tester to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.