Disconnecting the battery without first disarming will also set off the alarm system. The park and tail lights time out in 15-mins. The horn is programmed to time out in 3-mins to prevent battery drain and avoid messing with your neighbors. If it sees a hook, trunk, or ignition signal without first seeing a door unlock, it would set off the alarm. The SAM is programmed to look for a door unlock first. Some of the switches were hard wired to the SAM, others to the BCM.
While armed, the security alarm module (SAM) monitors the hood, trunk, door, and ignition switches via a data bus from the BCM. If the doors were opened without disarming, the horn would honk, parking lights would flash, and the SMEC would turn off the fuel injectors to prevent start-up. If you then used the remote keyless entry (RKE) to lock the doors, the SECURITY light would flash for 7-secs and then go out. In anti-theft equipped vehicles, the system would sense when you removed the ignition key. The SMEC communicated with the body control module (BCM). The engine controllers in that era were referred to as SMEC (single module engine controller). Starting in 1989, Chrysler started installing them on the C, G, and J body styles. Make and Model > Chrysler > 300M > Chrysler anti theft system Chrysler anti theft system Fix Chrysler anti theft systemĬhrysler anti-theft systems have gone through a few iterations.
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