Seat Belt Buckle Switch (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 "BUCKLE SW LH" 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 (driver side) connector and seat belt buckle switch (driver side) connector.
3. Check continuity between pre-crash seat belt control unit (driver side) and seat belt buckle switch (driver side).





4. Check continuity between pre-crash seat belt control unit (driver side) and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace harness between pre-crash seat belt control unit (driver side) 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 (Belt Buckle Switch).
Is the inspection result normal?
YES - Replace pre-crash seat belt control unit (driver side).
NO - Replace seat belt buckle switch (driver side).




Component Inspection (Belt Buckle Switch)
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).