DTC B1780 is stored when a malfunction is detected in the front occupant classification sensor LH circuit.
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 B1780 is output, perform troubleshooting for the DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
* If troubleshooting (wire harness inspection) is difficult to perform, remove the front passenger seat installation bolts to see
under the seat cushion.
* In the above case, hold the seat so that it does not fall down. Hold the seat only as necessary because holding the seat for a long
period of time may cause seat rail deformation.
PROCEDURE
1. CHECK CONNECTORS
(a) Turn the engine switch off.
(b) Disconnect the cable from the negative (-) battery terminal.
(c) Check that the connectors are properly connected to the occupant classification ECU and front occupant classification sensor LH.
OK:
The connectors are properly connected.
HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
(d) Disconnect the connectors from the occupant classification ECU and front occupant classification sensor LH.
(e) Check that the terminals of connectors are not damaged.
OK:
The terminals are not deformed or damaged.
NG -- REPLACE FRONT SEAT WIRE RH
OK -- Continue to next step.
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