Lamps/Lighting - Exterior
LAMPS/LIGHTING - EXTERIORDESCRIPTION
The exterior lighting system for this vehicle includes the following exterior lamp units:
- Center High Mounted Stop Lamp (8) - A standard equipment Center High Mounted Stop Lamp (CHMSL) is centered on the rear edge of the roof panel above the flip-up glass opening at the rear of the vehicle.
- Front Fog Lamps (7) - Two optional front fog lamps are available on this vehicle, grille opening panel mounted fog lamp units with an adjustable reflector that are secured behind a dedicated opening on each side of the grille panel below and inboard of the headlamps; or, free standing fascia mounted lamps with an adjustable mounting bracket that are secured to the upper horizontal surface of the front fascia below and inboard of the headlamps.
- Front Park Lamps (5) - A standard equipment front park lamp unit is mounted high at each outboard end of the front fascia.
- Front Position Lamps (4) - A front position lamp is integral to each headlamp unit in certain markets where they are required.
- Front Side Marker Lamps/Reflectors (6) - A front side marker lamp unit is mounted low on each outward facing outboard end of the front fascia. In certain markets where the side repeater lamp is required, the bulb and socket is deleted from the front side marker lamp and only the lamp housing with its reflective lens is used.
- Headlamps (2) - Standard equipment round headlamp units with a fixed lens and an adjustable reflector are secured to the grille opening panel at each side of the front grille. In certain markets where required, a headlamp leveling actuator motor and/or a front position lamp is/are integral to each headlamp.
- License Plate Lamps (10) - Vehicles with a license plate tub integral to the left side of the rear fascia have a single rear license plate lamp unit mounted to the underside of the upper horizontal wall of the fascia tub formation. Vehicles with a license plate bracket secured to the spare tire carrier have two rear license plate lamps mounted to the underside of the upper horizontal wall of the tub formation in the bracket.
- Light Bar Lamps (1) - Vehicles equipped with this option have a light bar mounted to the roof panel just rearward of the upper windshield opening header. Depending upon the market the vehicle is manufactured for, the light bar incorporates either two or four individually adjustable, forward-facing, auxiliary lamp units.
- Rear Lamp Units (9) - A standard equipment rear lamp unit is mounted to the rear of each quarter panel on either side of the tailgate opening.
- Side Repeater Lamps (3) - A side repeater lamp is mounted to each front fender just behind the front wheel in certain markets where they are required.
- Rear Reflectors - In certain markets where they are required, two rectangular, red reflectors are located on the rear bumper fascia, one just inboard and below each rear lamp unit.
These exterior lighting lamp units and their controls are combined to provide the following exterior lighting features:
- Auxiliary (Off-Road) Lamps - On vehicles equipped with the light bar lamp option, the auxiliary (off-road) light bar lamps include the clear bulbs, reflectors and clear lenses of each of the two or four adjustable lamps integral to the light bar.
- Backup Lamps - The backup (or reverse) lamps include a clear bulb, reflector and clear lens that are integral to each rear lamp unit.
- Brake Lamps - The brake (or stop) lamps include the clear bulbs, reflectors and red lenses that are integral to each rear lamp unit and the CHMSL.
- Daytime Running Lamps - Vehicles manufactured for sale in Canada illuminate the high beam filament of each headlamp bulb at a reduced intensity to serve as the Daytime Running Lamps (DRL).
- Front Fog Lamps - Both optional front fog lamps include the bulb, reflector and lens of each adjustable front fog lamp unit.
- Hazard Warning Lamps - The hazard warning lamps include the bulbs, reflectors and lenses of each lamp in the right and left, front and rear turn signal circuits.
- Headlamps - The headlamps include a single, dual filament halogen bulb, an adjustable reflector and a clear lens integral to each headlamp unit.
- Headlamp Leveling - Headlamp leveling is available only in certain markets where it is required equipment. A headlamp leveling actuator motor on each headlamp unit and a headlamp leveling switch mounted on the instrument panel allow the vertical axis of the headlamp beam pattern to be adjusted by the vehicle operator from the interior of the vehicle to compensate for passenger or cargo load.
- Optical Horn - Also known as flash-to-pass, the beam selection function of the multi-function switch left (lighting) control stalk has a momentary intermediate position that allows the headlamp high beams to be flashed momentarily, without changing the headlamp beam selection.
- Park Lamps - The front park lamps include either the clear bulbs, the reflectors and the amber lenses of the front park lamp units or the clear position lamp bulb integral to each headlamp unit. Vehicles not equipped with repeater lamp units have front side marker lamps. The bulbs are removed from the front side marker lamps on vehicles with repeater lamps so that they serve only as reflectors. The rear park lamps include a clear bulb, a reflector and a red lens integral to each rear lamp unit as well as the clear bulb and lens of the license plate lamp unit or units.
- Rear Fog Lamps - Rear fog lamps are available only in certain markets where they are required equipment. The rear fog lamps include a clear bulb, a reflector and a red lens that are integral to each rear lamp unit.
- Turn Signal Lamps - The front turn signal lamps include a clear bulb, a reflector, and an amber lens that are integral to each front park lamp unit and the front side marker lamps. In certain markets where required, the repeater lamps on each front fender replace the front side marker lamps in the front turn signal circuits. The rear turn signal lamps include an amber bulb, a reflector and a clear lens that are integral to each rear lamp unit.
Other components of the exterior lighting system for this vehicle include:
- Backup Lamp Switch - Vehicles equipped with a manual transmission have a plunger-type backup lamp switch located on the transmission housing. A Transmission Range Sensor (TRS) integral to the solenoid pack on the valve body of the optional electronic automatic transmission performs the backup lamp switch function on vehicles that are so equipped.
- Body Control Module - The Body Control Module (BCM) is located on the Junction Block (JB) under the driver side outboard end of the instrument panel.
- Brake Lamp Switch - A plunger-type brake lamp switch is located on the steering column support bracket under the instrument panel and is actuated by the brake pedal arm when the brake pedal is depressed.
- Combination Flasher - An electronic combination turn signal and hazard warning flasher is integral to the hazard warning switch in the center of the instrument panel.
- Daytime Running Lamp Relay - Vehicles manufactured for sale in Canada use a solid state Daytime Running Lamps (DRL) relay installed in the Junction Block (JB) instead of the conventional high beam relay.
- Front Fog Lamp Relay - Vehicles equipped with the optional front fog lamps have a front fog lamp relay located in the Junction Block (JB).
- Hazard Switch - The hazard switch is located near the center of the instrument panel and includes the electronic combination flasher circuitry for the hazard warning system and the turn signal system.
- Headlamp Leveling Motor - A headlamp leveling actuator motor is located on the back of each headlamp housing of vehicles manufactured for certain markets where the headlamp leveling feature is required.
- Headlamp Leveling Switch - A thumbwheel actuated four-position headlamp leveling switch is mounted in the driver side instrument panel bezel of vehicles manufactured for certain markets where the headlamp leveling feature is required.
- High Beam Relay - A high beam relay is located in the Junction Block (JB) of all vehicles except those that are manufactured for sale in Canada. Canadian vehicles have a solid state Daytime Running Lamps (DRL) relay in the JB instead of the high beam relay.
- Light Bar Lamp Switch - A rocker actuated light bar lamp switch is mounted in the driver side instrument panel bezel of vehicles equipped with the optional light bar lamps.
- Low Beam Relay - A low beam relay is located in the Junction Block (JB) of all vehicles.
- Multi-Function Switch - The multi-function switch is located on the steering column, just below the steering wheel. The multi-function switch includes a left (lighting) control stalk and a right (wiper) control stalk. The left control stalk is dedicated to providing almost all of the driver controls for both the exterior and interior lighting systems.
- Park Brake Switch - A park brake switch is located on the park brake lever mechanism on the floor panel transmission tunnel between the two front seats.
- Park Lamp Relay - A park lamp relay is located in the Junction Block (JB) of all vehicles.
- Rear Fog Lamp Relay - Vehicles manufactured for certain markets where rear fog lamps are required equipment have a rear fog lamp relay located in the Junction Block (JB).
- Trailer Tow Connector - Vehicles equipped with a factory-installed trailer towing package have a heavy duty 7-way trailer tow connector installed in a bracket on the trailer hitch receiver.
- Trailer Tow Relays - Vehicles equipped with a factory-installed trailer towing package have a connector bank containing four relays located behind the right quarter trim panel. The four relays are used to supply fused ignition switch output (run), brake lamps, right turn signal, and left turn signal outputs to a trailer through the trailer tow wiring and connectors. Refer to the appropriate wiring information.
- Trailer Tow Wiring Adapter - Vehicles equipped with a factory-installed trailer towing package have a wiring adapter provided that adapts the factory-installed heavy duty 7-way trailer tow connector to a conventional 4-way light duty connector.
- Turn Signal Cancel Cam - A turn signal cancel cam is integral to the clockspring of all vehicles.
Hard wired circuitry connects the exterior lighting system components to the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the exterior lighting components through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.
OPERATION
Following are paragraphs that briefly describe the operation of each of the major exterior lighting systems. The hard wired circuits and components of the exterior lighting systems may be diagnosed and tested using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.
However, conventional diagnostic methods may not prove conclusive in the diagnosis of the Body Control Module (BCM), the ElectroMechanical Instrument Cluster (EMIC), the Powertrain Control Module (PCM) or the Programmable Communications Interface (PCI) data bus. The most reliable, efficient, and accurate means to diagnose the BCM, the EMIC, the PCM, the PCI data bus or the electronic bus message inputs and outputs related to the various exterior lighting systems requires the use of a diagnostic scan tool.