Circuit/System Description

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) receives battery voltage from the INT LAMPS fuse in order to supply power to the courtesy lamps. The BCM applies this voltage to the courtesy lamps through the courtesy lamp control circuits. When any door or the rear hatch is opened, the door open switch contacts close and the BCM receives a door or rear hatch open signal. The BCM will activate the courtesy lamp control circuit, providing battery voltage to the courtesy lamps. The courtesy lamps can be manually activated by placing the interior lamp switch in the DOME position.

The inadvertent courtesy lamp feature provides a similar function for the interior lamps as the retained accessory power feature. The BCM will energize the inadvertent courtesy lamp control circuit when the BCM is in the active state (awake) and the ignition is OFF. The BCM will continue to supply voltage to the dome, overhead courtesy, and reading lamps after the ignition is turned OFF so that the interior lamps may be operated with there individual on/off switches. In the event that any of these lamps were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent courtesy lamp control circuit to prevent a total battery discharge condition.