Normal Operation
WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
When the headlamp switch is placed in the ON position, voltage is supplied to the dimmer switch through circuit 14 (BN). The dimmer switch then sends a variable voltage to the instrument cluster and the backlighting lamps through circuit 19 (LB/RD). Ground is supplied to the dimmer switch through circuit 57 (BK).