Ok Replace Center Airbag Sensor Assembly Dtc B Passenger Side Buckle Switch Circuit Malfunction Description

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



DTC Detecting Condition

Trouble Area


• The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the passenger side buckle switch circuit for 2 seconds.

• Passenger side buckle switch malfunction

• Occupant classification ECU malfunction

• Front seat inner belt RH

• Occupant classification ECU

• Seat wire No. 1



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


2006 RESTRAINTS Supplemental Restraint System - Sequoia

Fig. 152: Passenger Side Buckle Switch Circuit Malfunction - Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.


• If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installation bolts to see the under surface of seat cushion.

• In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time may cause a problem, such as seat rail deformation. Hold the seat only as necessary.

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