Every air bag module has its firing circuit that ignits powder to deploy air bag according to signal of SRSCM.
SRSCM checks every air bag module when ignition "ON". Once any fault is detected, it is erased only by scantool.
The SRSCM sets DTC B139500 if there's any short circuit in harness of every firing circuit to one another.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
•
Check current(PWM type) | 1. Short circuit in squib harness. 2. SRSCM. | |
Enable Conditions |
•
Ignition "ON" | ||
Threshold Value |
•
Squib lines are cross coupled
•
Make other line sink, and then other squib line answers | ||
Diagnostic Time | Qualification |
•
More than 300ms | |
De-Qualification |
•
N.A | ||
