Circuit/System Description
WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
Battery voltage is applied at all times to the right front cornering lamp PCB relay which is part of the underhood fuse block. When the turn signal switch is placed in the right turn position, ground is applied through the right turn signal switch signal circuit to the body control module (BCM) The BCM then applies a ground to the right cornering lamp relay control circuit energizing the relay. With the relay energized, battery voltage is applied through the switch side of the relay, the RF CRN LAMP Fuse and the right front cornering lamp supply voltage circuit to the right front cornering lamp.