B1512

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.
1. Disconnect the negative (-) terminal cable from the battery, and wait at least 30 seconds.
2. Remove the DAB module.
3. Disconnect the connectors of the PAB, left and right side airbags, belt pretensioners and satellite sensors.
4. Disconnect the SRSCM connector.

CAUTION: Place the DAB with the front surface facing up-ward.





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]: Go to the next step.





3. Check the seat belt switch

[CHECK]
Check the resistance with the switch on and off.

SWITCH OPEN : R = 4KOhm ± 10% (Belted)
SWITCH OPEN : R = 1KOhm ± 10% (Unbelted)

[NG]: Replace the seat belt switch

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