Exterior Lighting

EXTERIOR LIGHTING

Headlamps
The headlamp system is a dual-beam pattern system. It consists of a low and high beam, with a replaceable bulb. The headlamp assembly has the park/turn indicator lamp integrated into the headlamp assembly. The headlamp switch routes voltage to the headlamps, parking lamps and the autolamp system when demanded. All exterior lighting devices require between 11.3 and 14 volts for the lamps to illuminate correctly. An exterior lamp that appears to be dim may be caused by voltage that is below this level.

Autolamps
The autolamp system, controlled by the vehicle security module, supplies voltage to the same circuits used by the headlamp switch to power the exterior lamps when low light conditions are detected. The autolamp system provides light sensitive automatic on/off control of the exterior lamps normally controlled by the headlamp switch. The autolamp system keeps the exterior lamps on for a pre-selected period of time after the ignition switch is turned off. The pre-selected time lapse is adjustable up to approximately three minutes. Refer to the owner literature for further information about the autolamp time lapse adjustment.

Stoplamps
When the brake pedal is pressed, the brake pedal position (BPP) switch routes power directly to the high mounted stoplamp and the multifunction switch. The multifunction switch then routes voltage to the rear lamps.

Turn Signal/Hazard Lamps
Switched ignition voltage is supplied to the electronic flasher relay for the turn signals. Power is then routed to the multifunction switch. When the multifunction switch is placed in the LH or RH turn positions, voltage is routed to the LH or RH turn signal lamps. The electronic flasher relay will then cycle the voltage on and off approximately 80 times per minute. If a front or rear turn bulb is inoperative, the electronic flasher relay will then cycle the voltage on and off approximately 160 times per minute. The hazard switch is integral to the multifunction switch. Battery voltage is supplied to the electronic flasher for the hazard lamp operation. The electronic flasher routes power to the multifunction switch. When the hazard switch is engaged, power is routed to all the turn lamps. The electronic flasher relay will then cycle the voltage on and off approximately 80 times per minute.

Parking Lamps
The headlamp switch routes power to the parking lamps when demanded.

Fog Lamps
The fog lamp switch is integral to the headlamp switch. When the fog lamp switch is engaged, voltage is routed to the fog lamp relay coil, which then energizes and routes voltage to the fog lamps. The fog lamp relay coil uses the high beam circuit for ground. When the high beams are turned on, the fog lamp relay will not energize.

Reversing Lamps
The reversing lamps receive voltage when the reversing lamp relay is energized. When the transmission is placed in REVERSE, the digital transmission range (TR) sensor routes power to the reversing lamp relay to energize the coil.

Trailer Tow
The trailer tow stop/turn lamps receive power from the vehicle's rear stop/turn lamp circuits. When a rear stop/turn lamp is illuminated, voltage is also sent to the trailer tow connector. The trailer tow parking lamps are supplied voltage by the trailer tow parking lamp relay. When the parking lamps are illuminated, voltage is also sent to the trailer tow parking lamp relay coil. When the trailer tow parking lamp relay is energized, power is routed to the trailer tow connector. The trailer tow reversing lamps are supplied power from the vehicle's reversing lamp circuit. When the reversing lamps are illuminated, voltage is supplied to the trailer tow connector.

Daytime Running Lamps (DRL)
The DRL system operates the low-beam headlamps at a reduced intensity. When the ignition switch is in the RUN position, the DRL enable relay supplies battery voltage to the DRL relay. The DRL relay allows voltage to flow to the DRL resistor, which reduces voltage to the low-beam headlamps when the ignition switch is in the RUN position. If the high beams are turned on, voltage from the high beam supply circuit also flows to the DRL relay. When the DRL relay is energized, voltage to the DRL resistor is interrupted.