Headlamps

Voltage is supplied to the Headlamp Switch at all times. The Headlamp Switch includes a Self-Resetting Circuit Breaker. The Circuit Breaker opens when the Headlamp Switch draws too much current. When the Circuit Breaker opens, it interrupts the current flow. With no current flow, the Circuit Breaker cools off and resets automatically. When the Headlamp Switch is in HEAD, the Headlamp Dimmer Switch directs voltage to either the Low Beam or High Beam Headlamps (depending on Headlamp Dimmer Switch position). When the Headlamp Switch is in the HEAD position, not only is voltage supplied for the Headlamps, but the Daytime Running Lamps (DRL) Module receives a Headlamps "ON" signal. When the DRL Module receives this signal, it disables DRL operation (if Ignition Switch is RUN, BULB TEST or START positions).

When the Headlamp Switch is in HEAD and the Headlamp Dimmer Switch is in the LO position, voltage is applied through the closed contacts of the Headlamp Switch and the Headlamp Dimmer Switch to the LH and RH Low Beam Headlamps. Ground is supplied from G112 to the RH Low Beam Headlamp. Ground is supplied from G200, through the normally closed contacts of the Daytime Running Lamps (DRL) Relay to the LH Low Beam Headlamp (BASE Headlamps) or from G113 to the LH Low Beam Headlamp (QUAD Headlamps). Since both power and ground are applied to the Low Beam Headlamps, they light.

When the Headlamp Dimmer Switch is moved to the HI position with the Headlamp Switch in HEAD, voltage is applied through the closed contacts of the Headlamp Switch and the Headlamp Dimmer Switch to the DRL Module, LH High Beam Headlamp and the RH High Beam Headlamp. With the Headlamp Dimmer Switch in the HI position the DRL Module receives a "High Beam Operation" signal. When this signal is received, the DRL Module applies voltage to the High Beam Indicator. Since the High Beam Indicator is supplied with a ground from G200, it lights. Ground is supplied from G112 for the RH High Beam Headlamp. Ground is supplied from G200, through the normally closed contacts of the DRL Relay to the LH High Beam Headlamp. With both power and ground applied to the High Beam Headlamps, they light at full intensity.