Headlamp: Description and Operation

HEADLAMPS (WITHOUT DRL) -- HOW THE CIRCUIT WORKS

Voltage is present at the coil and contacts of the Headlamp Relay at all times through the "HEAD" Fuse.

With the Main Light Switch in the "HEAD" position, the Headlamp Relay coil is grounded and its contacts close. Current then flows through the "HEAD" Fuse, the Headlamp Relay contacts, the Dimmer Switch contacts and either the Hi or Lo Beam Headlamps to ground depending on the Dimmer Switch position. With the Dimmer Switch in the "HI BEAM" position, current also flows through the Instrument C1uster "HI" Beam Indicator to ground and the Indicator illuminates.

Moving the Main Light Switch to the "PARK" or "OFF" position turns off the headlamps.

The Main Light Switch contains a Flash to Pass Switch that allows the driver to flash the Low Beam headlamps without using the regular headlamp portion of the Main Light Switch. When the Headlamps are turned "OFF" and the Flash to Pass Switch is engaged, battery voltage from the "HEAD" Fuse is applied to the Low Beam Headlamps.

Headlamp Retractors

When the Headlamp Switch is in "HEAD", battery voltage is applied to terminal B of the Headlamp Retractor Control Module. When the Flash To Pass Switch is engaged and the Headlamp Switch is "OFF", battery voltage is applied to terminal B of the Headlamp Retractor Control Module through the "HEAD" Fuse, Flash To Pass Switch, and the Dimmer Switch. The Headlamp Retractor Control Module applies voltage to Headlamp Retractors through the Headlamp Retractor Switch to raise and lower the Retractors. Voltage is applied to circuit 266 (R) or 267 (0/BK) to raise or lower the Headlamp.