B1790: Center Airbag Sensor Assembly Communication Circuit Malfunction: Description

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

The center airbag sensor communication circuit consists of the occupant classification ECU and the center airbag sensor.

DTC B1790 is set when a malfunction is detected in the center airbag sensor communication circuit.

DIAGNOSTIC TROUBLE CODE TABLE

DTC No.	DTC Detection Condition	Trouble Area
B1790	When one of following conditions met: Occupant classification ECU receives line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in center airbag sensor communication circuit for 2 seconds Center airbag sensor malfunction Occupant classification ECU malfunction	No. 1 seat wire Floor wire Occupant classification ECU Center airbag sensor assembly

NOTE: Replace the occupant classification ECU, occupant classification sensor, seat cushion cover pad, seat cushion cover and seat cushion seat heater as a 5 part set (see supply set part no.).

HINT:

When DTC B1650/32 is detected as a result of troubleshooting the supplemental restraint system, check the DTCs stored in the occupant classification ECU, and perform troubleshooting for those DTCs first.
Use the intelligent tester to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.