Air bag warning lamp is located at cluster
When key is in 'ignition on' position, SRSCM performs diagnosis of overall air bag system.If there's no fault, air bag.
Warning lamp in cluster flickers for a whlie and then goes out.
SRSCM measures voltage of out terminal of warning lamp to check if warnning lamp is operated in accordance with signal SRSCM sends.
The SRSCM sets DTC B2500 if there is an open circuit or short to ground in air bag circuit harness.
Item
Detecting Condition
Possible cause
DTC Strategy
Check voltage
Burnt-out fuse.
Burnt-out warning lamp.
Open circuit in warning lamp harness.
Short circuit in warning lamp harness.
Faulty SRSCM.
Case 1
Enable
conditions
Ignition "ON"
When AWL is commanded ON by the ACU and Shorted to Battery
Threshold value
Battery voltage > 1.5 V
Case 2
Qualification
When AWL is commanded OFF by the ACU and Open or shorted to ground
De-Qualification
Battery voltage < 5 V
Diagnostic Time
More than 1.2 sec remaining
More than 2(Open)~17(Short) sec remaining