K 1500 Truck 4WD V8-6.5L DSL Turbo VIN S (1999)
Body Control Module: Description and Operation
Battery Run Down Protection
The battery run down protection provides protection against parasitic loads and excessive battery drain and high current loads related to the courtesy
lamp circuit. The battery run down protection will also protect the battery against being run down from the courtesy lamp circuit to the level which will
not allow the vehicle to start. The BCM will turn off the courtesy lamp circuit after the ignition switch is turned from the run position to the off position
and 20 minutes (1216 seconds) have elapsed and without a lamp request input. In order to return the BCM to normal operation once the battery run
down protection has shut the interior lamps off, the ignition switch is cycled from off position to the on position.
