Air Bag Control Module (ACM)
WARNING: This page is about a different car, the 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
ACM is located behind lower instrument panel. Impact sensor (safing sensor) is an integral part of ACM. The ACM monitors critical input and output circuits within air bag system, ensuring they are operating correctly. Some circuits are tested continuously; others are checked only under certain conditions. The ACM provides information about air bag system through AIR BAG warning light and ACM data link connector. A fault code (message) is stored whenever AIR BAG warning light stays on for 12 seconds or more.
ACM contains a capacitor which acts as a back-up power supply. In the event that battery power is lost during a front end collision, back-up power supply is able to deploy air bags for up to 2 minutes, after disconnection.