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Passenger Seat Belt Buckle Switch Circuit

NOTE: If LEXUS scan tool is available, start test from step 1). If this scan tool is not available, start test from step 2).

  1. Check Passenger Seat Belt Buckle Switch & Warning Occupant Detection Sensor Using Scan Tool

    Using scan tool, check passenger seat belt buckle switch and warning occupant detection sensor using DATA LIST. If passenger seat belt buckle switch and warning occupant detection sensor are not okay, go to next step. If passenger seat belt buckle switch and warning occupant detection sensor are okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.

  2. Check Passenger Seat Belt Buckle Switch

    Check passenger seat belt buckle switch. See PASSENGER SEAT BELT BUCKLE SWITCH under COMPONENT TESTS. If passenger seat belt buckle switch is okay, go to next step. Replace passenger seat belt buckle switch as necessary. Retest system operation.

  3. Check Warning Occupant Detection Sensor

    Check warning occupant detection sensor. See WARNING OCCUPANT DETECTION SENSOR under COMPONENT TESTS. If warning occupant detection sensor is okay, go to next step. Replace warning occupant detection sensor as necessary. Retest system operation.

  4. Check Circuits

    Check circuits for faults between passenger seat belt buckle switch, warning occupant detection sensor, body control ECU No. 2 and ground. See WIRING DIAGRAMS. Repair or replace as necessary. If circuits are okay, go to next test listed in appropriate TROUBLE SHOOTING SYMPTOMS table.
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