DTC B1781 Front Occupant Classification Sensor RH Circuit Malfunction: Description

WARNING: This page is about a different car, the 2006 Lexus RX 400h. 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 DETECTION CONDITION AND TROUBLE AREA

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