B1657

DTC B1620 AIRBAG UNIT INTERNAL FAULT
DTC B1650 CRASH RECORDED IN FRONT AIRBAG
DTC B1651 CRASH RECORDED DRIVER SIDE AIRBAG
DTC B1652 CRASH RECORDED PASSENGER SIDE AIRBAG
DTC B1657 CRASH RECORDED BELT PRETENSIONER ONLY
DTC B1658 BELT PRETENSIONER 6 TIMES DEPLOYMENT
DTC B1670 CRASH RECORDED IN FULL STAGE

DESCRIPTION

SRSCM MALFUNCTION
The SRSCM shall also cyclically monitor the following
1. Functional readiness of the firing circuit activation transistors.
2. Adequacy of deployment energy reserves.
3. Safing sensor integrity : detection of faulty closure.
4. Plausibility of accelerometer signal.
5. Operation of SRSCM components.

The timely completion of all tests is monitored by a separate hardware watchdog. During normal operation, the watchdog is triggered periodically by the SRSCM : If the SRSCM fails to trigger the watchdog, the watchdog will reset the SRSCM and activate the SRS SRI.

The SRSCM must be replaced once the fault codes (except B1657) mentioned above are confirmed. When B1657 is only monitored, SRSCM can be resuable 5 times.