DTC B1781 Front Occupant Classification Sensor RH Circuit Malfunction: Description

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

The front occupant classification sensor RH circuit consists of the occupant classification ECU and the front occupant classification sensor RH.

DTC B1781 is recorded when a malfunction is detected in the front occupant classification sensor RH circuit.

DTC DETECTING CONDITION AND TROUBLE AREA REFERENCE

DTC No.	DTC Detecting Condition	Trouble Area
B1781	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 front occupant classification sensor RH circuit for 2 seconds. Front occupant classification sensor RH malfunction Occupant classification ECU malfunction	Front seat assembly RH (Front occupant classification sensor RH) Occupant classification ECU Front seat wire RH

HINT:

When DTC B1150/23 is detected as a result of troubleshooting for "AIRBAG SYSTEM", check the DTCs stored in the occupant classification ECU. When DTC B1781 is output, perform troubleshooting for the DTC.