Headlights (USA: SC)

How the Headlights Circuit Works (USA: SC)

Low Beams
The headlight relays receive battery voltage at all times. When the headlight switch is moved to the HEAD position with the dimmer switch in LOW, ground is applied through the BLU/RED wire to the coils of the headlight relays. The relays are then energized, applying battery voltage to the left and right low and high beam headlights through fuses 15 and 17 (in the under-hood fuse/relay box). The low beam headlights illuminate because they are grounded directly to the body of the vehicle.

High Beams
The headlight relays receive battery voltage at all times. When the headlight switch is moved to the HEAD position with the dimmer switch in HIGH, ground is applied through the BLU/RED wire to the coils of the headlight relays. The relays are then energized, applying battery voltage to the left and right low and high beam headlights through fuses 15 and 17 (in the under-hood fuse/relay box). The high beam headlights and high beam indicator illuminate because a path to ground is provided through the dimmer switch. The low beam headlights will illuminate because they are grounded directly to the body of the vehicle.

Flash-to-Pass
When the flash-to-pass switch is moved to the ON position, ground is applied through the BLU/RED wire to the coils of the headlight relays. The relays are then energized, applying battery voltage to the left and right low and high beam headlights through fuses 15 and 17 (in the under-hood fuse/relay box). The high beam headlights and and high beam indicator illuminate because a path to ground is provided through the flash-to-pass switch. The low beam headlights illuminate because they are grounded directly to the body of the vehicle.