B1512

B1512 DRIVER SEAT BELT SWITCH SHORT TO GND

CIRCUIT DESCRIPTION
This system decides whether the seat belt of the driver or passenger are locked and then prevent the belt pretensioner from deploying on crash.

INSPECTION PROCEDURE
1. Preparation







2. Check buckle switch sensor circuit (Short to GND/Battery).

[CHECK]
Measure the voltage and resistance of the seat belt switch high and body ground between the SRSCM connector and the seat belt switch connector.

Resistance : Infinity>

Voltage: 0 V

[NG]->
Repair or replace the harness between the SRSCM and the seat belt switch.

[OK]->




3. Check the seat belt switch

[CHECK]
Check the resistance with the switch on and off.
SWITCH OPEN : R = 630 Ohm - 770 Ohm (Belted)
SWITCH OPEN : R = 360 Ohm - 440 Ohm (Unbelted)

[NG]-> Replace the seat belt switch

[OK]-> From the results of the above inspection the malfunctioning part can now be considered normal.