B1657

DTC B1657 CRASH RECORDED (BELT PRETENSIONER ONLY)

CIRCUIT DESCRIPTION

SRSCM MALFUNCTION
The SRSCM monitors the following
1. Condition of the firing circuit activation transistors.
2. Adequacy of deployment energy reserves.
3. Sating sensor integrity. (detection of faulty closure)
4. Plausibility of the accelerometer signal.
5. Operation of the 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 SRI (Service Reminder Indicator). The SRSCM must be replaced once the above fault codes are confirmed.

For B1657 five times reusability is possible.