Normal Operation
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
When the headlamp switch is placed in the PARK position or the headlamp ON position, voltage is supplied to the instrument panel dimmer switch and the dimmer module through circuit 14 (BN). The instrument panel dimmer switch then sends a variable voltage to the backlighting control system through circuit 235 (RD/BK). The ground signal for the dimmer switch is supplied through circuit 1205 (BK).