Standard Testing

DTC B1512 Seat Belt Buckle Switch [Driver]-Short or Short to Ground

Circuit Description
This system decides whether the seat belt (driver's and passenger's seat) is locked or not, and so prevents the belt pretensioner on unlocked seat side from deploying on crash.

NOTE:
- BS: Belt Buckle Switch
- SRSCM: Supplemental Restraints System Control Module

INSPECTION PROCEDURE

1. Preparation
1. Disconnect negative (-) terminal cable from the battery, and wait at least 30 seconds.
2. Disconnect the connector of the seat belt buckle switch.
3. Disconnect the connector of the SRSCM.







2. Check seat belt buckle switch sensor circuit (Short to ground and battery line).

CHECK: On the BS connector (harness side), measure the voltage and the resistance between BS and body ground.

Resistance: Infinity
Voltage: 0 V

NG: Repair or replace the harness or the connector between the SRSCM and the BS.

OK: Go to step "3".




3. Check the seat belt buckle switch

CHECK: Check the resistance with the seat belt buckle switch ON and OFF.

Belted (S/W ON): 3.6 - 4.4 k Ohm
Unbelted (S/W OFF): 0.9 - 1.1 k Ohm

NG: Replace the BS.

OK: Check the SRSCM.