Air Bag Control Module

Air Bag Control Module (ACM) continuously monitors air bag system for faults to ensure driver-side and/or passenger-side air bag deployment will occur when necessary. If ACM deploys air bag(s), a message is transmitted over Programmable Communication Interface (PCI) to Central Timer Module (CTM) to unlock doors. There are no external impact sensors, it is all contained within ACM. Other components of air bag system include driver and passenger knee bolsters, AIRBAG warning light, clockspring, passenger-side air bag on/off switch (if equipped) and related wiring. When vehicle is started, AIRBAG warning light should illuminate for 6-8 seconds, then turn off. If AIRBAG warning light remains illuminated, a fault is indicated in air bag control system or PCI bus network. ACM has its own set of Diagnostic Trouble Codes (DTC). ACM DTC are not permanent and can clear when reason for code is corrected. For additional information on ACM, see appropriate AIR BAG RESTRAINT SYSTEMS article.