Driver Side

SEAT BELT BUCKLE SWITCH - DRIVER SIDE





Description
- Performs the control of tension reducer according to the seat belt buckle switch ON/OFF.
- Detects whether or not the seat belt is fastened when the ignition switch turns ON. If the seat belt is not fastened, illuminates the seat belt warning lamp on the combination meter.
- The seat belt buckle switch is installed in the seat belt buckle.




Component Function Check
1.CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
With CONSULT-III
When checking "SB SW LH SIG" on DATA MONITOR screen, check that ON/OFF display changes synchronized with the insertion operation to the seat belt buckle.





Is the inspection result normal?
YES - Seat belt buckle switch (driver side) circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
Check that voltage between seat belt buckle switch (driver side) and ground.





Is the inspection result normal?
YES - Seat belt buckle switch (driver side) circuit is normal.
NO - GO TO 2.
2.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit connector and seat belt buckle switch (driver side) connector.
3. Check continuity between pre-crash seat belt control unit and seat belt buckle switch (driver side).





4. Check continuity between pre-crash seat belt control unit and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace harness between pre-crash seat belt control unit and seat belt buckle switch
(driver side).
3.CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
Check continuity between seat belt buckle switch (driver side) and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace harness between seat belt buckle switch and ground.
4.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
Check seat belt buckle switch (driver side). SEE Component Inspection.
Is the inspection result normal?
YES - Replace pre-crash seat belt control unit. Removal And Installation.
NO - Replace seat belt buckle switch (driver side).




Component Inspection
1.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
1. Turn ignition switch OFF.
2. Disconnect seat belt buckle switch connector.
3. Check continuity of seat belt buckle (driver side).





Is the inspection result normal?
YES - INSPECTION END
NO - Replace seat belt buckle switch (driver side).


SEAT BELT BUCKLE SWITCH - DRIVER SIDE





Description
- Seat belt buckle switch is installed in seat belt buckle.
- Seat belt buckle switch detects condition of seat belt.




Component Function Check
1.CHECK FUNCTION
1. Turn ignition switch ON.
2. Select "SEAT BELT SW" in the "Data Monitor" mode using CONSULT-III.
3. Check the forward switch signal under the following condition.





Is the indication normal?
YES - Seat belt buckle switch (driver side) function is OK.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect seat belt buckle switch (driver side) connector.
3. Check voltage between seat belt buckle switch (driver side) harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) CIRCUIT
1. Disconnect driver seat control unit connector.
2. Check continuity between driver seat control unit harness connector and seat belt buckle switch (driver side) harness connector.





3. Check continuity between driver seat control unit harness connector and ground.





Is the inspection result normal?
YES - Replace driver seat control unit. Removal And Installation.
NO - Repair or replace harness.
3.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) GROUND CIRCUIT
Check continuity between seat belt buckle switch (driver side) harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace harness.
4.CHECK SEAT BELT BUCKLE SWITCH
Check seat belt buckle switch (driver side). SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 5.
NO - Replace seat belt buckle switch (driver side). Exploded View.
5.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Intermittent Incident.
- INSPECTION END




Component Inspection
1.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
1. Turn ignition switch OFF.
2. Disconnect seat belt buckle switch (driver side) connector.
3. Check continuity between seat belt buckle switch (driver side) terminals.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace seat belt buckle switch (driver side). Exploded View.