Description
DESCRIPTION
The exterior lighting system for this vehicle includes the following exterior lamp units:
- Center High Mounted Stop Lamp (4) - A standard equipment Center High Mounted Stop Lamp (CHMSL) is centered on the liftgate header panel just above the flip-up glass opening at the rear of the vehicle.
- Front Fog Lamps (3) - Vehicles equipped with this option have a separate fog lamp unit mounted near each outboard end of the front fascia, below each front lamp unit.
- Front Lamp Units (1) - A standard equipment halogen front lamp unit is mounted to the front of each front fender panel on either side of the grille opening.
- License Plate Lamps (7) - Two standard equipment rear license plate lamp units are mounted to the underside of the brow trim applique, just above the license plate tub formation in the outer liftgate panel.
- Rear Lamp Units (5) - A standard equipment rear lamp unit is mounted to the rear of each quarter panel on either side of the liftgate opening.
These exterior lighting lamp units and their controls are combined to provide the following exterior lighting features:
- Automatic Headlamps - Vehicles with the automatic headlamps option are equipped with a unique left (lighting) multi-function switch that includes an A (Automatic) position and have an automatic headlamp sensor to sense ambient light levels. The automatic headlamp sensor is integral to the sun load sensor located on the top of the instrument panel of vehicles without automatic wipers, or is integral to the Rain Sensor Module (RSM) (also known as the Rain Light Sensor Module/RLSM) located on the inside of the windshield below the upper windshield opening header of vehicles with automatic wipers. When the A position of the headlamp switch is selected, the headlamps are turned ON and OFF automatically as ambient light levels dictate.
- 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 a clear bulb, reflector and a red lens that are integral to each rear lamp unit, and the red lens and multiple Light-Emitting Diode (LED) units of the CHMSL.
- Daytime Running Lamps - Vehicles manufactured for sale in Canada or for United States fleet sales illuminate the high beam headlamp bulb in each front lamp unit at a reduced intensity to serve as the Daytime Running Lamps (DRL).
- Exterior Lamp Fail-Safe Operation - The Front Control Module (FCM) provides a fail-safe feature which will automatically turn ON the low beam headlamps and all park lamps when the ignition switch is in the ON position and the Steering Control Module (SCM) reports that there is no detected input from the left (lighting) multi-function switch, or when there is no communication over the Local Interface Network (LIN) data bus or the Controller Area Network (CAN) data bus.
- Exterior Lamp Load Shedding - The FCM provides a battery saver feature which will automatically turn OFF all exterior lamps that remain ON with the ignition switch in the LOCK position after a timed interval of about eight minutes.
- Front Fog Lamps - The 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 quad halogen headlamp system includes two single filament halogen bulbs in each front lamp unit, one low beam and one high beam, and an adjustable reflector and clear lens integral to each front lamp unit. Each front lamp unit also includes integral chambers for a park and turn signal bulb as well as a front side marker bulb.
- Optical Horn - Also known as flash-to-pass, the beam selection function of the left (lighting) 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.
- Park Lamps - The front park lamps include either a clear bulb, a reflector, and an amber lens or an amber bulb, a reflector, and a clear lens that are integral to the park lamp compartment of each front lamp unit, or the clear position lamp bulb within the headlamp high beam compartment of both front lamp units. 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 bulbs and lenses of the two license plate lamp units.
- SmartBeam(R) Automatic Headlamps - Vehicles equipped with the optional automatic headlamp system may also have the SmartBeam(R) automatic (auto high beam) headlamp option available. SmartBeam(R) includes a unique digital light-sensing imager camera integral to the electrochromic inside rear view mirror and programming that allows it to detect light levels, their color and their source within the path ahead of the vehicle. When SmartBeam(R) is enabled, the A (Automatic) position of the headlamp switch is selected, the high beam position of the headlamp dimmer is selected and the ambient light conditions are appropriate, the headlamp high beams are turned ON and OFF automatically as needed.
- Turn Signal Lamps - Depending upon market requirements the front turn signal lamps include a clear bulb, a reflector, and an amber lens or an amber bulb, a reflector, and a clear lens that are integral to each front lamp unit. Also depending upon market requirements, either the front side marker lamps or the repeater lamps on each front fender will also be included in the front turn signal circuits. Again depending upon market requirements, the rear turn signal lamps include either a clear bulb and a red or amber lens or an amber bulb and a clear lens and a reflector that are integral to each rear lamp unit.
Other components of the exterior lighting system for this vehicle include:
- Backup Lamp Switch - A Transmission Range Sensor (TRS) integral to the solenoid pack on the valve body of the electronic automatic transmission performs the backup lamp switch function for this vehicle.
- 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.
- Front Control Module - The Front Control Module (FCM) is integral to the Integrated Power Module (IPM). The FCM/IPM is located in the engine compartment, near the battery. Description.
- Front Fog Lamp Relay - Vehicles equipped with optional front fog lamps have a front fog lamp relay located in the IPM.
- Hazard Warning Switch - A latching push button-actuated hazard warning switch is integral to the upper switch pod located just above the heater and air conditioner controls in the center stack area of the instrument panel.
- Instrument Cluster - The ElectroMechanical Instrument Cluster (EMIC) is also known as the Cab Compartment Node (CCN) in this vehicle. The EMIC/CCN is located in the instrument panel above the steering column opening, directly in front of the driver. Description.
- Left Multi-Function Switch - The left (lighting) multi-function switch is located on the steering column, just below the steering wheel. A control stalk that extends from the left side of the switch is used to select the turn signal lamps (right or left) and to select the headlamp beam (low, high or optical horn). A control knob on the control stalk is used to select the park lamps, headlamps or fog lamps. A control sleeve on the stalk just below the control knob provides control of the panel lamps and most of the interior lighting features.
- 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 IPM of all vehicles.
- SmartBeam(R) Module - The SmartBeam(R) automatic high beam digital imaging camera and system logic circuitry is integral to the electrochromic inside rear view mirror on a bracket above the headliner near the upper windshield opening header.
- Steering Control Module - The Steering Control Module (SCM) is located within the left multi-function switch housing on the top of the steering column, just below the steering wheel. Description.
- Trailer Tow Connector - Vehicles equipped with a factory-installed trailer towing package have either a light duty 4-way trailer tow connector or a heavy duty 7-way trailer tow connector installed in a bracket on the trailer hitch receiver. This package also includes an electric trailer brake wiring provision that terminates in the passenger compartment under the left end of the instrument panel as a dark green 14 gauge wire that is taped back on itself about 50 millimeters (2 inches) beyond the dash panel grommet for the headlamp and dash wire harness.
- Trailer Tow Relays - Vehicles with a factory-installed trailer towing package except those equipped with a Trailer Module (TM), have two trailer tow relays installed in the IPM in the engine compartment. One relay is for the trailer right turn and brake lamps, and the other is for the trailer left turn and brake lamps.
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.