Seat Belt Buckle Switch Signal Circuit

SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT

Description

Transmits a seat belt buckle switch signal to the combination meter.


Component Function Check


1. CHECK COMBINATION METER INPUT SIGNAL

Select "DATA MONITOR" for "METER/M&A" and check the "SEAT BELT W/L" monitor value.
SEAT BELT W/L

When seat belt is fastened: OFF
When seat belt is unfastened: ON
- Inspection End.


Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]Audible Warning Device.

1. CHECK COMBINATION METER INPUT SIGNAL

1.Turn ignition switch ON.
2.Check voltage between combination meter harness connector M24 terminal 27 and ground.

27 - Ground
When driver seat belt is fastened: Approx. 12V
When driver seat belt is unfastened: Approx. 0V

Is the inspection result normal?
YES- Replace combination meter. Service and Repair.
NO- GO TO 2

2. CHECK SEAT BELT BUCKLE SWITCH CIRCUIT






1.Turn ignition switch OFF.
2.Disconnect combination meter and seat belt buckle pre-tensioner assembly LH (seat belt buckle switch).
3.Check continuity between combination meter harness connector
M24 (B) terminal 27 and seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) harness connector B74 (A) terminal 1.
27 - 1: Continuity should exist.
4.Check continuity between combination meter harness connector
M24 (B) terminal 27 and ground.
27 - Ground: Continuity should not exist.
Is the inspection result normal?
YES- GO TO 3
NO- Repair or replace harness.

3. CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT





Check continuity between seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) harness connector B74 terminal 2 and ground.
2 - Ground: Continuity should exist.
Is the inspection result normal?
YES- Inspection End.
NO- Repair or replace harness.


Component Inspection


1. CHECK SEAT BELT BUCKLE SWITCH






1.Turn ignition switch OFF.
2.Disconnect the seat belt buckle pre-tensioner assembly LH
(seat belt buckle switch).
3.Check continuity between the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) terminals 1 and 2.

1- 2
When seat belt is fastened: Continuity should not exist.
When seat belt is unfastened: Continuity should exist.

Is the inspection result normal?
YES- Inspection End.
NO- Replace the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch).