Headlamp: Description and Operation
Circuit OperationLo Beam Operation
With the lamp switch in HEAD and the dimmer/passing switch in LO, the lamp switch provides a ground path to the headlamp relays. The headlamp relay energizes and provides battery voltage to the lo beam headlamps and the lo beam headlamps light up.
Hi Beam Operation
With the lamp switch in HEAD and the dimmer/passing switch in HI, the lamp switch provides a ground to the headlight relays and the dimmer/passing switch provides a ground path for the high beam filaments. The headlight relay energizes and provides battery voltage to the headlamps and the hi beams light up.
Battery voltage is also applied to the hi beam indicator and the hi beam indicator lights up to remind the driver that the hi beams are on.
Flash To Pass Operation
The flash to pass feature works with the lamp switch in OFF, PARK, or HEAD (lo beams). When the passing switch is turned on, it provides a ground path for both the hi and lo beam filaments and the headlamp relays. The headlamp relays energize and applies battery voltage to the headlamps and to the hi beam indicator lamp and the hi and lo beams light up. The hi beam indicator also flashes during the flash to pass operation. The flash to pass function has no effect if the hi beams are already on.
Fog Lamp Operation
With the lamp switch in HEAD and the dimmer/passing switch in LO, the lamp switch provides a ground path to the headlamp relay which provides power through the EB-10 (FOG LAMP) fuse to the fog lamp relay. A ground path is provided for the fog lamp relay through the fog lamp switch and the dimmer/passing switch. When the relay is energized, power is provided to both fog lamps and the fog lamps light. When the fog lamp switch is turned off or when the dimmer/passing switch is moved to HI, ground is removed from the fog lamp relay and the fog lamps go out.