Air Bag Control Module: Description and Operation

SYSTEM OPERATION
The Airbag Control Module (ACM) contains the impact sensor, and a microprocessor that monitors the airbag system to determine its readiness. The ACM contains On-Board Diagnostics (OBD), and will light the airbag warning lamp in the instrument cluster when a monitored airbag system Diagnostic Trouble Code(s) (DTC's) occurs.

The ACM also contains an energy-storage capacitor. The purpose of the capacitor is to provide airbag system protection, if the initial impact has damaged or disconnected the battery.

The ACM cannot be repaired and, if damaged or faulty, it must be replaced.