Fig.1) Driver airbag
Driver Air bag module (hereinafter referred to DAB) located at center of steering wheel protects driver by reducing impact of collision.
DAB is consist of air bag, pat cover and two inflator.
There are power,circuit for ignition, gas generator and diffuser screen in inflator.
Air bag reduces impact of collision by fillied up gas.
In collision, pat cover splits and through this crack, air bag emerges and deploys.
Inflator generates gas that expands air bag.
Clock spring is located between steering wheel and column. It connects SRSCM to DAB.
Never measure resistance of DAB directly, Current of measuring device may cause unexpected air bag deploy.
The SRSCM sets DTC B134800 if there is a short to ground in DAB harness
*In this case, SRSCM checks if there's any fault in circuit by sending current for a while
Item
Detecting Condition
Possible cause
DTC Strategy
Check Resistance
Short to ground in DAB harness.
Poor connection of connected part.
Faulty DAB.
Faulty Clock spring.
Check SRSCM
Enable Conditions
Ignition "ON"
Threshold Value
Short to ground in DAB
Diagnostic Time
Qualification
More than 2s (200ms x 10)
De-Qualification
More than 4s (200ms x 20)
Test Condition
Resistance
Ignition ON
1.0O < Squib resistance < 6.9O