Exterior Lamps

CIRCUIT OPERATION

Turn Lights:

With the Ignition Switch in RUN, BULB TEST or START, voltage is applied through the TURN B/U Fuse and Turn Flasher to the normally closed contact of the Hazard Switch in the Turn-Hazard Switch.

With the Turn-Hazard Switch in the TURN LEFT position, voltage is applied to both the LH Turn Indicator and the LH Front Park/Turn Light (LT BLU wires). Voltage is also applied to the LH Rear Turn Light (YEL wire). On vehicles with Daytime Running Lights, voltage is applied to connector C1, cavity E, of the DRL Module. The module controls the LH Front Turn Light. See DAYTIME RUNNING LIGHTS for operation of the DRL Module.

The turn lights go on immediately. They begin to flash when the current flow heats up the timing element in the Turn Flasher and it repeatedly opens and closes the circuit.

The voltage applied to the Front Park/Turn Light will also be applied to the LH Front Marker Light (without DAYTIME RUNNING LIGHTS). If the Light Switch is in the OFF position, the LH Front Marker Light will find a path to ground through S105 and the many lights connected in parallel to ground. These lights provide low resistance paths to ground. The Marker Light will flash with the Turn Lights. The lights used for the ground path will not flash, however, since the voltage drop across the Marker Light is much higher than that across the other lights.

When the Light Switch is in either PARK or HEAD, voltage is applied through the TAIL Fuse, Light Switch, and S105 to the Marker and Park Lights. If the Turn-Hazard Switch is in TURN LEFT, the LH Front Marker Light will have voltage at both connections and will go out. When the Turn Flasher stops voltage to the Turn Light, the Marker Light will be grounded through the Turn Light and will go on. In this way, the LH Front Marker Light will flash on when the LH Front Park/Turn Light goes off, and off when the Turn Light goes on.

With Daytime Running Lights the Front Marker Lights do not flash with the Turn Lights. Only the Turn Lights will flash with the Turn-Hazard Switch in TURN LEFT.

With the Turn-Hazard switch in TURN RIGHT, voltage is applied to the RH Lights in a similar way.


Stop Lights:

Voltage is applied at all times through the STOP HAZ Fuse to the Brake Switch. When the brake pedal is depressed, the contacts in the Brake Switch close. Voltage is applied to the LH and RH Tail/Stop Lights and the Center High-Mounted Stop Light. The Stop Lights go on.


Hazard Light:

Voltage is applied at all times through the STOP HAZ Fuse and the Hazard Flasher to the normally open contact of the hazard switch in the Turn-Hazard Switch. With the hazard switch in HAZARD, voltage is applied to both Front and Rear Turn Lights. All of the Turn Lights and both Turn Indicators flash on and off.

The Front Marker Lights flash in HAZARD just as they did in TURN RIGHT and TURN LEFT (without DAYTIME RUNNING LIGHTS). If the Light Switch is in OFF, they flash on when the Hazard Lights are on. If the Light Switch is in either PARK or HEAD, they flash on when the Hazard Lights are off, and off when the Hazard Lights are on.

With DAYTIME RUNNING LIGHTS the Front Marker Lights do not flash with the Turn Lights. Only the Turn Lights will flash with the Turn-Hazard Switch in HAZARD.

In HAZARD, the turn circuit is always open. and the Hazard Flasher controls the lights.


Front Marker Lights: (Without DAYTIME RUNNING LIGHTS)

The Front Marker Lights can be lit by the Park Lights or the Turn Lights. Neither of the two wires to each of the marker bulbs is a ground wire.

With the Park Lights on, battery voltage is supplied through the BRN wires to both Marker Lights. The path to ground for the marker bulbs is through the Turn Lights. The small Marker Light bulbs light up, but not the larger turn bulbs.

When the Turn Lights are on, but not the Park Lights, battery voltage is applied through the LT BLU wires to the Marker Lights. They glow since they are grounded through the entire Park Light system. As before, the small marker bulbs light up, but not all the parking bulbs.

If both the Park Lights and a set of Turn lights are on at the same time, the marker bulb for that side will not light up. With battery voltage on both sides of a bulb, it will not glow. When the Turn Lights flash off, however, the marker bulb on that side will come on since it is now grounded through the Turn Lights. This circuit makes the turn and marker bulbs flash out of step with each other when the Park Lights are on.


Front Marker Lights: (With DAYTIME RUNNING LIGHTS)

The Front Marker Lights can be lit by putting the Light Switch in PARK or HEAD. Voltage is provided through the brown wires to each Front Marker Light. The ground path for the Marker Lights is to G103 (LH) or G104 (RH). The Marker Lights will not flash when the turn signal is on, they will have a steady glow.

License, Tail, or Rear Marker Lights:

Voltage is applied through the TAIL Fuse to the Light Switch at all times. With the Light Switch in PARK or HEAD, voltage is applied through the fuse and the Light Switch to all of the lights in this circuit