Lamps/Lighting - Exterior

Exterior Lamps:

The exterior lighting system for this model includes the following exterior lamp units:

- Center High Mounted Stop Lamp - 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 - Two optional front fog lamps are available on this model, 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 - A standard equipment front park lamp unit is mounted high at each outboard end of the front fascia.
- Front Position Lamps - A front position lamp is integral to each headlamp unit in certain markets where they are required.
- Front Side Marker Lamps/Reflectors - 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 - 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 - 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 - 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 - 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 - 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, a reflector and a clear lens that are integral to each rear lamp unit.
- Brake Lamps - The brake (or stop) lamps include a clear bulb, a reflector and a red lens that are integral to each rear lamp unit and the CHMSL.
- Daytime Running Lamps - Vehicles manufactured for sale in Canada have Daytime Running Lamps (DRL) that illuminate the high beam filament of each headlamp bulb at a reduced intensity while driving with the exterior lighting turned Off.
- Front Fog Lamps - Both optional front fog lamps include the clear bulb, the reflector and the clear 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.
- Optical Horn - Also known as flash-to-pass, the beam selection function of the multi-function switch control stalk has a momentary intermediate position that allows the headlamp high beams to be flashed momentarily, without changing the headlamp beam selection.
- 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.
- 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. On vehicles not equipped with repeater lamp units, the front park lamps also include the front side marker lamps. 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.
- 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 model 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 models 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 actuated by the brake pedal arm.
- 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 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.

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. 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.

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.

BACKUP LAMPS
The backup (or reverse) lamps have a path to ground at all times through a takeout and eyelet terminal of the rear lighting wire harness that is secured by a ground screw to the base of the right D-pillar behind the quarter trim panel. The backup lamps receive battery voltage from a fused ignition switch output (run) fuse on the back-up lamp feed circuit only when the backup lamp switch (manual transmission) or the Transmission Range Sensor (TRS - electronic automatic transmission) is closed by the gearshift mechanism within the transmission.

BRAKE LAMPS
The brake (or stop) lamps have a path to ground at all times through the rear lighting harness and a takeout and eyelet terminal of the rear body wire harness that is secured by a ground screw at the base of the right D-pillar behind the quarter trim panel. The Center High Mounted Stop Lamp (CHMSL) has a path to ground at all times through a takeout and eyelet terminal of the rear body wire harness that is secured by a ground screw at the base of the driver side (left or right) D-pillar behind the quarter trim panel. The brake lamps and CHMSL receive battery voltage from a fuse in the Junction Block (JB) on the brake lamp switch output circuit when the brake lamp switch is closed by the brake pedal arm.

DAYTIME RUNNING LAMPS
Vehicles manufactured for sale in Canada illuminate the high beam filament at a reduced intensity when the engine is running and the exterior lamps are turned off. This feature is enabled by the Body Control Module (BCM) and a solid state Daytime Running Lamps (DRL) relay, which is installed in the Junction Block (JB). The high beam relay is omitted from the JB on vehicles equipped with DRL.

When the BCM monitors an engine speed signal of greater than 450 rpm and the status of the exterior lighting switch input is Off, the BCM duty cycles the DRL relay to produce illumination of the headlamp high beam filaments at a reduced intensity. The BCM also provides normal headlamp high beam operation through the DRL relay on vehicles so equipped. When the DRL relay is energized, it provides battery voltage from a fused B(+) fuse in the JB to the headlamp high beam filament through the DRL relay output circuit.

FRONT FOG LAMPS
Vehicles equipped with optional front fog lamps have a premium Body Control Module (BCM), a front fog lamp relay installed in the Junction Block (JB), a front fog lamp switch integral to the left control stalk of the multi-function switch, and the ElectroMechanical Instrument Cluster (EMIC). The front fog lamps have a path to ground at all times through their connection to the front fascia wire harness from two take outs with eyelet terminals that are secured by ground screws to the left inner fender shield in the engine compartment.

The BCM controls front fog lamp operation by monitoring the exterior lighting switch input from the multi-function switch, then energizing or de-energizing the front fog lamp relay control coil. The BCM also sends the appropriate electronic message to the EMIC over the Programmable Communications Interface (PCI) data bus to control operation of the front fog lamp indicator.

When the front fog lamp relay is energized, it provides battery voltage from a fused B(+) fuse in the JB to the front fog lamps through the front fog lamp relay output circuit. The BCM provides a battery saver (load shedding) feature for the front fog lamps, which will turn these lamps off if they are left on for more than about eight minutes with the ignition switch in the Off position. In certain markets where required, the front fog lamps are also turned off by the BCM whenever the headlamp high beams are selected. Each front fog lamp includes an integral adjustment screw to be used for static aiming of the fog lamp beams.

HAZARD WARNING LAMPS
With the hazard switch in the On position, the hazard warning system is activated causing the hazard switch button, the right and left turn signal indicators, and the right and left turn signal lamps begin to flash on and off. When the hazard warning system is activated, the circuitry within the hazard switch and electronic combination flasher unit will repeatedly energize and de-energize two internal relays that switch battery voltage from a fused B(+) fuse in the Junction Block (JB) to the turn signal indicators, and the turn signal lamps through the right and left turn signal circuits.

The flashing of the hazard switch button illumination lamp is performed internally by the hazard switch and combination flasher unit circuit board. The hazard warning lamps can also be energized by the Body Control Module (BCM) through a hazard lamp control circuit input to the hazard switch and combination flasher unit.

HEADLAMPS
The headlamp system includes the Body Control Module (BCM), a low beam relay installed in the Junction Block (JB), a high beam relay installed in the JB (except Canada), a solid state Daytime Running Lamps (DRL) relay installed in the JB (Canada only), the exterior lighting switches integral to the left (lighting) control stalk of the multi-function switch, and the ElectroMechanical Instrument Cluster (EMIC). The headlamps have a path to ground at all times through the grille opening reinforcement wire harness and two take outs with eyelet terminals of the headlamp and dash wire harness that are secured by ground screws to the left inner fender shield in the engine compartment.

The BCM controls headlamp operation by monitoring the exterior lighting switch inputs from the multi-function switch, then energizing or de-energizing the low beam relay, the high beam relay or the solid state circuitry of the DRL relay. It also sends electronic messages to the EMIC over the Programmable Communications Interface (PCI) data bus to control operation of the high beam indicator. When each respective relay is energized, it provides battery voltage from a fuse in the Power Distribution Center (PDC) through a relay (low beam, high beam, or DRL) output circuit.

The BCM also provides a battery saver (load shedding) feature for the headlamps, which will turn these lamps off if they are left on for more than about eight minutes with the ignition switch in the Off position; and, a headlamp delay feature with optional delay intervals that can be programmed using a diagnostic scan tool. Each headlamp includes an integral reflector adjustment screw to be used for static aiming of the headlamp beams.

HEADLAMP LEVELING
In certain markets where required, a headlamp leveling system is provided on the vehicle. The headlamp leveling system includes unique headlamp units equipped with a headlamp leveling actuator motor, and a rotary thumbwheel actuated headlamp leveling switch on the instrument panel. The headlamp leveling system allows the headlamp beams to be adjusted to one of four vertical positions to compensate for changes in inclination caused by the loading of the vehicle suspension.

The leveling motors are mechanically connected through an integral pushrod to the adjustable headlamp reflector. The headlamp leveling switch is a resistor multiplexed unit that provides one of four voltage outputs to the headlamp leveling motors. The headlamp leveling motors will move the headlamps to the selected position based upon the voltage input received from the switch. The headlamp leveling motors and switch have a path to ground at all times. The headlamp leveling components operate on battery voltage received through the fused park lamp relay output circuit so that the system will only operate when the exterior lighting is turned on.

LIGHT BAR LAMPS
The optional light bar (auxiliary off-road) lamps system the Body Control Module (BCM), the light bar switch on the instrument panel, and the Electro-Mechanical Instrument Cluster. For all North American markets, the light bar switch receives battery voltage on a fused ignition switch output (run-start) circuit, which enables the switch to energize the lamps whenever the ignition switch is in the On or Start positions. For markets outside of North America, the light bar switch receives battery voltage from the park lamp relay in the Junction Block (JB) on the park lamp relay output circuit, and monitors an input from the low beam driver output circuit of the low beam relay in the JB, which enables the switch to energize the light bar lamps only with the park lamps On and the low beam headlamps Off.

The light bar lamps have a path to ground at all times through a take out and eyelet terminal of the instrument panel wire harness that is secured by a nut to a ground stud on the left instrument panel end bracket (left-hand drive) or the center of the instrument panel support structure (right-hand drive). The light bar switch controls light bar lamp operation by providing battery voltage from a fused B(+) fuse in the Power Distribution Center (PDC) to the lamps on the lightbar switch output circuit. When the lightbar switch output circuit is energized, the light bar switch also provides an input to the BCM on the lightbar switch sense circuit. The BCM then provides the appropriate electronic messages to the EMIC over the Programmable Communications Interface (PCI) data bus to control operation of the light bar indicator, the high beam indicator, or both indicators as required by the market for which the vehicle was manufactured.

PARK LAMPS
The park lamps system includes the Body Control Module (BCM), a park lamp relay installed in the Junction Block (JB), and the exterior lighting switch integral to the left (lighting) control stalk of the multi-function switch. The front park lamp and side marker lamp or, if equipped, the front position lamp bulbs each have a path to ground at all times through two take outs with eyelet terminals of the headlamp and dash wire harness that are secured by ground screws to the left inner fender shield in the engine compartment. The rear park and license plate lamps have a path to ground at all times through a take out and eyelet terminal of the rear body harness that is secured by a ground screw to the base of the right D-pillar behind the quarter trim panel.

The BCM controls park lamp operation by monitoring the exterior lighting switch input from the multifunction switch, then energizing or de-energizing the park lamp relay. When the park lamp relay is energized, it provides battery voltage from a fuse in the Power Distribution Center (PDC) through a park lamp relay output circuit to the appropriate lamp bulbs. On vehicles manufactured for North American markets only, the BCM also provides a battery saver (load shedding) feature for the park lamps, which will turn these lamps off if they are left on for more than about eight minutes with the ignition switch in the Off position.

REAR FOG LAMPS
Rear fog lamps are installed on vehicles manufactured for certain markets where they are required. The rear fog lamp system includes a premium Body Control Module (BCM), a rear fog lamp relay installed in the Junction Block (JB), and a rear fog lamp switch integral to the left (lighting) control stalk of the multi-function switch. The rear fog lamps operate in concert with the front fog lamps. The rear fog lamps have a path to ground at all times through a take out and eyelet terminal of the rear body wire harness that is secured by a ground screw to the base of the right D-pillar behind the quarter trim panel.

The BCM controls rear fog lamp operation by monitoring the exterior lighting switch input from the multi-function switch, then energizing or de-energizing the rear fog lamp relay control coil and sending the appropriate electronic messages to the instrument cluster over the Programmable Communications Interface (PCI) data bus to control rear fog lamp indicator operation. When the rear fog lamp relay is energized, it provides battery voltage from a fused B(+) fuse in the JB to the rear fog lamps through the rear fog lamp relay output circuit. The BCM also provides a battery saver (load shedding) feature for the rear fog lamps, which will turn these lamps off if they are left on for more than about eight minutes with the ignition switch in the Off position.

TURN SIGNAL LAMPS
When the left control stalk of the multi-function switch is moved up (right turn) or down (left turn), the turn signal system is activated causing the selected right or left turn signal indicators and turn signal lamps to flash on and off. When the turn signal system is activated, the circuitry within the turn signal switch and the hazard switch/electronic combination flasher unit will repeatedly energize and de-energize one of two internal relays that switch battery voltage from a fused ignition switch output (run) fuse in the Junction Block (JB) to the appropriate turn signal indicator and turn signal lamps.

The ElectroMechanical Instrument Cluster (EMIC) chime tone transducer will generate an audible turn signal cancel warning each time the vehicle is driven for a distance of about 3.2 kilometers (about two miles) with a turn signal indicator flashing. The EMIC uses Programmable Communications Interface (PCI) data bus distance messages from the Power-train Control Module (PCM) and a hard wired input from the turn signal switch circuitry or the multifunction switch to determine when to sound the turn signal cancel warning.

WARNING: TO AVOID PERSONAL INJURY OR DEATH, EYE PROTECTION SHOULD BE USED WHEN SERVICING ANY GLASS COMPONENTS.

CAUTION:
- Do not contaminate the glass of halogen bulbs with fingerprints or allow contact with other possibly oily surfaces. Reduced bulb life will result.
- Do not use bulbs with higher candle power than indicated in the Bulb Application table. In addition, do not use fuses, circuit breakers or relays having greater amperage value than indicated on the fuse panel or in the Owner's Manual. Damage to lamps, lenses, wiring and other related electrical components can result.