Check Seat Belt Buckle Switch (Driver Side) Circuit

PRE-CRASH SEAT BELT


Check Seat Belt Buckle Switch (Driver Side) Circuit

1.CHECK PRE-CRASH SEAT BELT CONTROL UNIT INPUT SIGNAL
With CONSULT-III
Select "SB SW LH SIG" on DATA MONITOR screen, and then make sure that ON/OFF display changes synchronized with the insertion operation to the seat belt buckle.

SB SW LH SIG
When driver seat belt is not fastened : OFF
When driver seat belt is fastened : ON

Without CONSULT-III
1. Turn ignition switch ON.





2. Check voltage between seat belt buckle switch (driver side) harness connector and ground.





OK or NG
OK - Seat belt buckle switch (driver side) circuit is OK.
NG - GO TO 2.
2.CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) HARNESS
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit and seat belt buckle switch (driver side) connector.





3. Check continuity between pre-crash seat belt control unit harness connector and seat belt buckle switch (driver side) harness connector.





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





OK or NG
OK - GO TO 3.
NG - Repair or replace harness.
3.CHECK LH SEAT BELT SWITCH





Check continuity between seat belt buckle switch (driver side) while performing the insertion operation to the seat belt buckle.





OK or NG
OK - GO TO 4.
NG - Replace seat belt buckle switch (driver side).
4.CHECK LH SEAT BELT SWITCH GROUND CIRCUIT HARNESS





Check continuity between seat belt buckle switch (driver side) harness connector and ground.





OK or NG
OK - Check harness connection.
- If it is OK, replace pre-crash seat belt control unit.
- If it is NG, repair or replace malfunction part.
NG - Repair or replace harness.