Device Power
WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.
Battery 1 voltage is supplied to the BCM by circuit 2540. Battery 2 voltage is supplied to the BCM by circuit 1640. These inputs are internally monitored by the BCM for proper operating voltage. The proper operating voltage range is from 9-16 volts.