DTC B1780 Front Occupant Classification Sensor LH Circuit Malfunction: Description

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

DTC B1780 is set when a malfunction is detected in the front occupant classification sensor LH circuit.

DTC DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
B1780	One of following conditions is met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in front occupant classification sensor LH circuit for 2 seconds Front occupant classification sensor LH malfunction Occupant classification ECU malfunction	Front seat frame with adjuster RH (Front occupant classification sensor LH) Front seat wire RH Occupant classification ECU

HINT:

When DTC B1650/32 is detected as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1780 of the occupant classification system.
Use a Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.