Circuit Operation - Battery Guard

The battery guard feature provides protection from excessive battery drain caused by high current loads being accidently left on. Controlling battery power (Controlled Power Mode) to selected modules up to three days after each ignition cycle accomplishes this protection.

The Body Control Module (BCM) provides power regulation through the use of a Low Power Driver and a High Power Control of the battery guard relay to the following components:
^ The Radio Receiver.
^ The Radio Interface Module (RIM).
^ The Fuel Filler Door Relay coil.
^ The Trunk Release Relay coil.
^ The Phone (Dealer Installed). The battery guard relay supplies the above components with power whenever the BCM is awake and for 15 minutes after the ignition transitions to Lock (High Power Mode). The components are supplied a parasitic current (Low Power Mode) while the BCM is asleep.

The BCM enters the No Controlled Power Mode if the BCM is idle for more than 3 days. The No Controlled Power Mode turns the Low Power output Off.