B1780

DTC B1780 Front Occupant Classification Sensor LH Circuit Malfunction

DESCRIPTION

DTC Detection Condition:

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

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

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 the intelligent tester or Techstream to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.

Wiring Diagram:

Step 1:

Step 1 (Continued)-3:

Step 4:

Step 4 (Continued)-5:

Step 6-9:

Step 9 (Continued)-12:

Step 12 (Continued):

INSPECTION PROCEDURE

NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.

HINT:
- If troubleshooting (wire harness inspection) is difficult to perform, remove the front seat RH installation bolts to see the undersurface of the seat cushion.
- In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time may cause problems, such as seat rail deformation. Hold the seat up only for as long as necessary.