Body Control Modules & Data Link Communications System: Operation

Battery rundown protection (or battery guard) feature provides protection from excessive battery drain caused by high current loads that are accidentally left on. When ignition is turned off, a time-out period is started. Time-out period will last for 40 minutes. When time-out expires, inadvertent power output is turned off.

When BCM activates an indicator in the instrument cluster, it may also produce a chime. The following chimes are provided: key-in-ignition, headlights on, unfastened seat belt, turn signal on, parking brake warning, door ajar warning and check gauges.