Exterior Lighting

EXTERIOR LIGHTING

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

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 smart junction box (SJB) supplies voltage to the headlamps when demanded.

Autolamps
The autolamp system provides light sensitive automatic on/off control of the exterior lamps. The autolamp system keeps the exterior lamps on for a pre-selected period of time after the ignition switch is turned to the OFF position. The pre-selected time lapse is adjustable up to approximately 3 minutes.

To program the time lapse, carry out the following sequence:

1. NOTE: Steps 2 through 5 must be carried out within a 10-second period.

Start with the ignition switch in the OFF position and the headlamp switch in the AUTOLAMPS position.

2. Place the headlamp switch in the OFF position.
3. Place the ignition switch in the RUN position.
4. Place the ignition switch in the OFF position.
5. Place the headlamp switch in the AUTOLAMPS position.
- At this point, the exterior lamps turn on and start a timer.

6. At the desired autolamp time delay, place the headlamp switch in the OFF position.
- At this point, the exterior lamps turn off and the time delay is set.

Vehicles equipped with autolamps also have a feature that turns on the exterior lamps when the windshield wipers are turned on.

Stoplamps
The stoplamps are supplied voltage when the brake pedal is applied.

Turn Signal/Hazard Lamps
The front turn signal lamps are located within the headlamp assemblies. When the multifunction switch is placed in the LH or RH TURN positions, the SJB routes voltage to the LH or RH turn signal lamps. The SJB then cycles the voltage on and off approximately 80 times per minute. If a front or rear turn bulb is inoperative, the SJB cycles the voltage on and off approximately 160 times per minute.

The hazard switch is integral to the multifunction switch. When the hazard switch is engaged, the SJB supplies voltage to all the turn lamps. The SJB cycles the voltage on and off approximately 80 times per minute.

Parking Lamps
The SJB supplies voltage to the parking lamps when demanded. The front parking lamps are located in the headlamp assemblies. The rear parking lamps are located in the rear lamp assemblies.

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 lamps can be turned on when the ignition switch is in the RUN or ACC position, the low beam headlamps are on, and the high beam headlamps are off.

Reversing Lamps
When the transmission is placed in REVERSE, the SJB provides a ground for the reversing lamp relay coil (internal to the SJB). The reversing lamps receive voltage when the reversing lamp relay is energized. The reversing lamps are located within the rear lamp assemblies.

Trailer Tow
The SJB supplies voltage to the trailer tow stop/turn, parking and reversing lamps. When the vehicle's rear stop/turn lamp is illuminated, voltage is sent to the trailer tow connector. When the vehicle's parking lamps are illuminated, voltage is sent to the trailer tow connector. When the reversing lamps are illuminated, voltage is supplied to the trailer tow connector.

The trailer tow battery charge relay provides voltage to the trailer tow connector when the ignition switch is in the RUN or ACC position.

The vehicle comes equipped with circuitry to support trailer tow electric brakes.