DTC B1774: Pressure Sensor Circuit Malfunction; DTC B1775: Pressure Sensor Power Source Circuit Malfunction: Description

WARNING: This page is about a different car, the 2010 Lexus GS 450h. However, it is still accessible from the selected car via links, so may be relevant.

The pressure sensor circuit consists of the occupant classification ECU and the occupant detection sensor.

The occupant detection sensor sends the pressure signal to the occupant classification ECU.

DTC B1774 and B1775 are recorded when a malfunction is detected in the pressure sensor circuit.

DTC No.	DTC Detection Condition	Trouble Area
B1774 B1775	One of following conditions is met: Occupant classification ECU receives line short circuit signal, and open circuit signal, short circuit to ground signal or short circuit to B+ signal in pressure sensor circuit for 2 seconds Occupant detection sensor malfunction Occupant classification ECU malfunction	Front seat wire RH Occupant detection sensor Occupant classification ECU

HINT:

When DTC B1650/32 is detected as a result of troubleshooting for the "AIRBAG SYSTEM", check the DTCs stored in the occupant classification ECU. When DTC B1774 and B1775 are output, perform troubleshooting for the DTC.