DTC B1771: Passenger Side Buckle Switch Circuit Malfunction [10/2014 - 05/2019]: Description

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

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

Troubleshoot DTC B1771 first when DTCs B1771 and B1795 are output simultaneously.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1771	Passenger Side Buckle Switch Circuit Malfunction	One of the following conditions is met: Occupant detection ECU detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in the front passenger side buckle switch circuit for 2 seconds. Front passenger side buckle switch malfunction. Occupant detection ECU malfunction.	Front seat wire RH Front seat inner belt assembly RH Occupant detection ECU

HINT:

When DTC B1650/32 is stored as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1771 of the occupant classification system.
Use the Techstream to check for DTCs of the occupant detection ECU, otherwise the DTCs cannot be read.