Jeep Grand Cherokee (WK2)

2011-2013 Jeep WK2 Grand Cherokee Exterior Lighting Overview

Welcome to the JeepSpecs.com in-depth page on the 2011-13 WK2 Jeep Grand Cherokee exterior lighting. Did we miss anything? get in touch with us and let us know!

Description

The exterior lighting system for the 2011-2013 Grand Cherokee includes the following exterior lamp units:

 

  • Center High Mounted Stop Lamp – A standard equipment Center High Mounted Stop Lamp (CHMSL) is centered on the liftgate spoiler just above the flip-up glass opening at the rear of the vehicle.
  • Daytime Running Lamps – SRT vehicles have a unique high-intensity Daytime Running Lamp (DRL) mounted near each outboard end of the front fascia, below each front lamp unit. These lamps are illuminated by multiple Light Emitting Diode (LED) units. For SRT vehicles manufactured for sale in domestic markets, the DRL units also have a low-intensity mode that serves as accent lighting when the park lamps or head lamps are turned ON. Each DRL unit also has a unique, modular projector-type fog lamp and mounting bracket secured to the outboard end of the lamp. In non-SRT vehicles the DRL elements are integral to the front lamp units.
  • Front Fog Lamps – Non-SRT 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. For SRT vehicles, a unique, modular projector-type fog lamp and mounting bracket is secured to the outboard end of each front DRL unit mounted near each outboard end of the front fascia, below each front lamp unit.
  • Front Lamp Units – A halogen front lamp unit is standard equipment on vehicles manufactured for domestic markets. A High Intensity Discharge (HID) front lamp unit is standard equipment in vehicles manufactured for export markets and optional for domestic market vehicles. The front lamp units are mounted to the front of each front fender panel on either side of the grille opening.
  • License Plate Lamps – Two standard equipment rear license plate lamp units are mounted to the underside of the light bar and handle unit, just above the license plate tub formation on the outer liftgate panel.
  • Outside Mirror Signal Lamps – Vehicles equipped with this option have a signal lamp unit integral to the lower forward facing surface of each outside rear view mirror. These signal lamps are serviced only as a unit with the outside rear view mirror assembly.
  • Rear Lamp Units – A standard equipment two-piece rear lamp unit is mounted on each side at the rear of the vehicle. One piece of the rear lamp is secured to the end of each quarter panel on either side of the liftgate opening and the second piece is secured to each side of the liftgate outer panel, adjacent to the first piece of the rear lamp when the liftgate is closed.
  • Rear Fog Lamps – In certain export markets where they are required, two rectangular fog lamps with red lenses and reflectors are located in the rear bumper fascia, one just inboard and below each rear lamp unit. In domestic market vehicles, a red reflector is installed in the rear fascia in place of a rear fog lamp.
  • Repeater Lamps – A repeater lamp is mounted to each front fender just behind the front wheel opening on vehicles manufactured for certain export markets where they are required.

These exterior lighting lamp units and their controls are combined to provide the following exterior lighting features:

 

  • Automatic Headlamps – Automatic headlamps are standard equipment on this vehicle. The headlamp switch includes an A (Automatic) position and an automatic headlamp sensor senses ambient light levels. The automatic headlamp sensor is integral to the sun load sensor located on the top of the instrument panel. 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 – In domestic market vehicles, the backup (or reverse) lamps include a clear bulb, reflector and clear lens that are integral to each inner and outer rear lamp unit. In export market vehicles, backup lamps are found in only the two inner rear lamp units.
  • Brake Lamps – The brake (or stop) lamps include a clear bulb, reflector and a red lens that are integral to each outer rear lamp unit, and the red lens and multiple Light-Emitting Diode (LED) units of the CHMSL.
  • Daytime Running Lamps – Non-SRT vehicles manufactured for sale in Canada and equipped with halogen front lamp units illuminate the low beam headlamp bulb in each front lamp unit at a reduced intensity to serve as the Daytime Running Lamps (DRL). United States fleet vehicles, equipped with halogen front lamp units illuminate the high beam head lamp bulb in each front lamp unit at a reduced intensity to serve as DRL. Domestic market vehicles with HID front lamp units and DRL illuminate a dedicated DRL bulb in the front lamp unit, while export market vehicles illuminate a combination DRL/position lamp bulb in each front lamp unit. For SRT vehicles, the multiple LED units in both front DRL units provide the DRL feature, while the incandescent DRL bulbs in the front lamp units are used only for the position lamp function in vehicles manufactured for sale in export markets.
  • Exterior Lamp Fail-Safe Operation – The ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) and the Totally Integrated Power Module (TIPM) provide 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 there is no detected input from the headlamp switch, or when there is no communication over the Controller Area Network (CAN) data bus.
  • Exterior Lamp Load Shedding – The TIPM 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.
  • Headlamp Delay – The low or high beam headlamps remain illuminated for 90 seconds after the ignition switch has been turned to the OFF position. If the vehicle is equipped with the optional Electronic Vehicle Information Center (EVIC), the delay interval is customer-programmable for 0, 30, 60 or 90 seconds.
  • Headlamps – Two headlamp systems are available on this vehicle for domestic markets. The standard halogen headlamp system includes two single filament halogen bulbs in each front lamp unit, one low beam and one high beam. The optional HID headlamp system includes a single HID lighting element/igniter unit for low or high beam headlamps. An electric motor and mechanism internal to the HID lamp unit closes a shutter for low beams and opens the shutter for high beams. HID headlamps are standard equipment for all vehicles manufactured for export markets. The HID front lamp units each include an electronic ballast module, while an Automatic Headlamp Leveling Module (AHLM) that serves both front lamp units is mounted to the bottom of the right front lamp unit only. Both headlamp systems also include an adjustable reflector and clear lens integral to each front lamp unit.
  • Headlamp Leveling – On all vehicles equipped with optional HID headlamps, an Automatic Headlamp Leveling Module (AHLM) on the right front lamp unit controls a headlamp leveling actuator motor on each front lamp unit to automatically perform headlamp adjustments using inputs from front and rear axle sensors to monitor changes in the vehicle suspension height.
  • 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.
  • Park Lamps – The front park lamps include either the amber bulbs, the reflectors and the clear lenses of the park lamp compartment in both front lamp units or the clear position lamp bulb within the headlamp compartment of both front lamp units. On vehicles not equipped with repeater lamp units, the front lamps also include the front side marker lamp bulbs and amber reflectors. On vehicles equipped with repeater lamp units, only the amber side marker reflectors are retained in the front lamp units. The rear park lamps include a clear bulb, a reflector and a red lens integral to each inner and outer rear lamp unit as well as the clear bulbs and lenses of the two license plate lamp units.
  • Rear Fog Lamps – Rear fog lamps are available only in certain export markets where they are required equipment. The rear fog lamps include a clear bulb and a red lens and reflector that are integral to each rear fog lamp unit located below the outer tail lamps in the rear fascia. On domestic market vehicles, only the red reflector is retained in the rear fascia.
  • SmartBeam® Automatic Headlamps – Vehicles equipped with the optional SmartBeam® automatic headlamps include 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® is enabled, the high beam position of the headlamp dimmer switch is selected and the ambient light conditions are appropriate, the headlamp high beams are turned ON and OFF automatically as needed.
  • Turn Signal Lamps – The front turn signal lamps include an amber bulb, a reflector, and a clear lens that are integral to each front lamp unit. On vehicles equipped with the optional outside mirror signal lamps, there are several amber LED units integral to each mirror signal lamp unit that are also activated by the turn signal circuits for the same side of the vehicle. 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. Depending upon market requirements, the rear turn signal lamps include either a clear bulb and a red lens or an amber lens and a reflector that are integral to each outer rear lamp unit.

Other components of the exterior lighting system for this vehicle include:

 

  • Automatic Headlamp Leveling Module – Vehicles equipped with HID headlamps have an AHLM located on the bottom of the right front lamp unit housing. The AHLM monitors the vehicle ride height through the front and rear axle sensors, then provides inputs to the headlamp leveling motor on each front lamp unit as appropriate.
  • Axle Sensors – Vehicles equipped with HID headlamps have an axle sensor for both the front and the rear axles, which monitor the suspension height of the vehicle.
  • 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.
  • Daytime Running Lamp Relays – All non-SRT vehicles equipped with optional HID headlamps have two DRL relays located in the Power Distribution Center (PDC).
  • Electronic Ballast Module – Vehicles equipped with the HID headlamps have an electronic ballast module secured to the underside of each front lamp unit. Each module controls the HID lighting element/igniter within the front lamp unit to which it is mounted.
  • Hazard Switch – A latching push button-actuated hazard switch is integral to the switch pod located just below the heater and air conditioner controls in the center stack area of the instrument panel.
  • Headlamp Leveling Motor – A headlamp leveling actuator motor is located on the back of each front lamp unit housing of vehicles manufactured with HID headlamps.
  • Headlamp Switch – A headlamp switch is located on the left side of the instrument panel, below the left instrument panel vent outboard of the steering column. The headlamp switch includes a rotary knob to turn the park lamps and headlamps ON or OFF and is pushed inward for selecting the optional front fog lamps on vehicles so equipped. The headlamp switch also features a vertical thumbwheel for selecting the panel lamps dimming level, a PARADE mode to illuminate all Vacuum Fluorescent Display (VFD) units at full brightness for visibility when driving in daylight with the exterior lighting turned ON, and for interior lighting control.
  • 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.
  • Instrument Panel Switch Pod – A latching push button-actuated hazard switch is integral to the instrument panel switch bank located just below the air conditioning and heater controls in the center stack area of the instrument panel.
  • Multi-Function Switch – The multi-function switch is integral to the Steering Column Control Module (SCCM) located on the steering column, just below the steering wheel. A control stalk that extends from the left side of the SCM is used to select the turn signal lamps (right or left) and to select the headlamp beam (low, high or optical horn).
  • Park Brake Switch – A park brake switch is located on the park brake lever mechanism on the cowl side inner panel (Left-Hand Drive/LHD) or the right side of the floor panel transmission tunnel (Right-Hand Drive/RHD) to the left of the steering column.
  • SmartBeam® Module – The SmartBeam® automatic high beam digital imaging camera and system logic circuitry is integral to the electrochromic inside rear view mirror on the inside of the windshield.
  • Steering Control Module – The Steering Control Module (SCM) is located within and integral to the Steering Column Control Module (SCCM) located on the top of the steering column, just below the steering wheel.
  • Totally Integrated Power Module – The Totally Integrated Power Module (TIPM) is located in the engine compartment.
  • Trailer Tow Wiring – Domestic market vehicles with a factory-installed trailer towing package have a trailer tow wire harness with a combination 4-way and heavy duty 7-way trailer tow connector installed in the rear bumper fascia near the trailer hitch receiver. This package also includes an electric trailer brake wiring provision that terminates at a connector located on top of the large body harness connection bracket under the instrument panel to the left of the steering column. An electric trailer brake pigtail harness and an instruction card are available through MOPAR® to ease installation of most aftermarket electric trailer brake controllers.
  • Trailer Tow Relays – Domestic market vehicles with a factory-installed trailer towing package have two trailer tow relays installed in the TIPM 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.

Operation

Following are paragraphs that briefly describe the operation of each of the major exterior lighting systems. The lamps and the hard wired circuits between components related to the exterior lighting system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the exterior lighting system or the electronic controls or communication between modules and other devices that provide some features of the exterior lighting system. The most reliable, efficient, and accurate means to diagnose the exterior lighting system or the electronic controls and communication related to exterior lighting system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

AUTOMATIC HEADLAMPS

The automatic headlamp system includes the headlamp switch, the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN), the Totally Integrated Power Module (TIPM), the ignition switch (also known as the Wireless Ignition Node/WIN), the air conditioner – heater control unit and the sun load sensor on the top of the instrument panel.

The TIPM energizes the sun load sensor to provide an ambient light level input to the air conditioner – heater control whenever the electronic ignition switch status messages received from the WIN over the Controller Area Network (CAN) data bus indicate the ignition switch ON position is selected. The air conditioner – heater control responds to the sun sensor input by sending the appropriate electronic light level messages back to the TIPM over the CAN data bus. When the A (Automatic) position is selected with the headlamp switch, the EMIC responds to this input by sending an electronic lighting request message to the TIPM over the CAN data bus.

With the engine running, the TIPM responds to these messages by automatically controlling a pulse width modulated voltage output to the selected headlamp bulb filaments or electronic ballast units through the right and left low or high beam driver circuits to illuminate the headlamps. The TIPM also remembers which beams (low or high) were selected when the headlamps were last turned OFF, and energizes those beams and lamps again the next time it turns the headlamps ON.

BACKUP LAMPS

The backup (or reverse) lamps have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal. The Powertrain Control Module (PCM) continually monitors a hard wired multiplex input from the Transmission Range Sensor (TRS), then sends the proper electronic transmission gear selector status messages to other electronic modules over the CAN data bus. Whenever the ignition switch is in the ON position and the TIPM receives an electronic message indicating the status of the transmission gear selector is REVERSE, it provides a battery voltage output to the backup lamps on the backup lamp feed circuit.

BRAKE LAMPS

The brake (or stop) lamps and the Center High Mounted Stop Lamp (CHMSL) each have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal within the passenger compartment. The brake lamps and CHMSL receive battery voltage on the brake lamp switch feed circuit when the brake lamp switch is closed by the brake pedal arm. On domestic market vehicles, the TIPM monitors an input from the brake lamp switch, then provides the proper outputs to the brake lamps, while the CHMSL is controlled by a hard wired output from the brake lamp switch. On export market vehicles, the CHMSL and brake lamps are connected to a hard wired output from the brake lamp switch. On vehicles so equipped, the brake lamp function of the trailer tow stop/turn relays is controlled by an output from the TIPM based upon the hard wired input from the brake lamp switch.

DAYTIME RUNNING LAMPS – EXCEPT SRT

Non-SRT vehicles manufactured for sale in Canada and equipped with halogen headlamps illuminate both low beam headlamp bulbs at a reduced intensity when the engine is running, the parking brake is released, the automatic transmission gear selector is not in the PARK position and the exterior lamps are turned OFF. Under the same conditions, vehicles manufactured for U.S. fleet sales and equipped with halogen headlamps illuminate both high beam headlamp bulbs at a reduced intensity.

On non-SRT vehicles equipped with High Intensity Discharge (HID) headlamps regardless of the market, the TIPM operates a dedicated DRL bulb (domestic markets) or a combined position/DRL bulb (export markets) through right and left DRL relays to serve as the DRL. On SRT vehicles regardless of the market destination, a separate DRL lamp unit illuminates multiple Light Emitting Diode (LED) units at a high intensity to serve as the DRL.

The TIPM must be programmed appropriately for this feature to be enabled. Once enabled, anytime the TIPM receives electronic messages over the CAN data bus from the Powertrain Control Module (PCM) indicating the engine is running, from the EMIC indicating the status of the headlamp exterior lighting input is OFF or A (Automatic) and indicating that the parking brake is released, it energizes the appropriate bulbs or LED units. On vehicles with halogen headlamps, the TIPM provides a Pulse Width Modulated (PWM) voltage output to illuminate the appropriate headlamp bulbs at the proper intensity. On vehicles with HID headlamps, the TIPM provides a path to ground for the DRL relays to produce DRL illumination at the proper intensity.

DAYTIME RUNNING LAMPS – SRT ONLY

SRT vehicles regardless of the market destination are equipped with dedicated Daytime Running Lamps (DRL) containing multiple Light Emitting Diode (LED) units. In SRT vehicles manufactured for sale in domestic markets these DRL units also operate in a low intensity mode in conjunction with the park lamps and head lamps to serve as accent lighting. The DRL units in SRT vehicles manufactured for sale in export markets operate only at high intensity to serve as the DRL, and are turned OFF when the front fog lamps are illuminated. The TIPM controls SRT DRL unit illumination at the proper intensity for all markets.

FRONT FOG LAMPS

Vehicles equipped with optional front fog lamps include a front fog lamp switch integral to the headlamp switch on the instrument panel. The front fog lamps have a path to ground at all times through their connection to the Front End Module (FEM) wire harness. The FEM wire harness has takeouts with eyelet terminals that are secured by ground screws to the body sheet metal within the engine compartment. The EMIC monitors a hard wired multiplex input from the headlamp switch to determine whether the fog lamps are selected, then sends electronic fog lamp switch request messages to the TIPM over the CAN data bus.

When the TIPM receives a fog lamp switch request message it then controls front fog lamp operation by providing a battery voltage output to the fog lamps through the right and left front fog lamp control circuits. The TIPM also sends the appropriate electronic message back to the EMIC to illuminate or extinguish the front fog lamp indicator. The TIPM will automatically de-energize the front fog lamps any time the headlamp high beams are selected.

The TIPM also 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 after the electronic ignition switch status messages from the WIN transition to LOCK, if there is a charging system failure or if the electrical system voltage falls below about 11.75 volts for more than about 30 seconds. Each front fog lamp includes an integral adjustment thumbwheel to be used for static aiming of the fog lamp beams.

HAZARD WARNING LAMPS

The hazard warning system includes the EMIC, the TIPM and the hazard switch in the switch pod located in the center stack area of the instrument panel, below the air conditioner – heater controls. The TIPM monitors a hard wired input from the hazard switch through an internal pull-up to determine the status of the hazard switch.

When the TIPM receives an input from the hazard switch it controls hazard warning system operation and flash rate by controlling a battery voltage outputs through high side drivers on the right and left turn signal feed circuits. The TIPM also sends the appropriate electronic messages back to the EMIC over the CAN data bus to control the illumination and flash rate of the right and left turn signal indicators, as well as to control the click rate of an electromechanical relay soldered onto the EMIC electronic circuit board that emulates the sound emitted by a conventional hazard warning flasher. The EMIC then sends an electronic message to the instrument panel switch pod over the Local Interface Network (LIN) data bus to control the illumination of the hazard switch push button.

HEADLAMPS

The headlamp system includes the Steering Control Module (SCM), the EMIC and the TIPM, the headlamp switch on the instrument panel and the multi-function switch on the steering column. On vehicles with the optional High Intensity Discharge (HID) headlamps, the HID electronic ballast module of each front lamp unit is also part of the headlamp system. Each halogen headlamp bulb and the HID electronic ballast module has a path to ground at all times through their connection to the FEM wire harness. The FEM wire harness has takeouts with eyelet terminals that are secured by ground screws to the front end sheet metal within the engine compartment. The TIPM will store a Diagnostic Trouble Code (DTC) for any shorts or opens in the headlamp circuits.

The EMIC monitors a hard wired multiplex input from the headlamp switch to determine the status of the headlamp switch. The SCM monitors a hard wired multiplex input to determine the status of the multi-function switch and whether the headlamp high or low beams are selected. The SCM then sends the appropriate electronic headlamp beam select switch status messages to the TIPM over the CAN data bus. The EMIC then sends the appropriate electronic headlamp request messages to the TIPM over the CAN data bus. The TIPM responds to these messages by providing a Pulse Width Modulated (PWM) voltage output to the proper halogen headlamp bulbs or a control voltage to the HID electronic ballast modules through high side drivers on the right and left low and high beam feed circuits to illuminate the selected headlamp beams. The TIPM also sends the appropriate electronic messages to the EMIC to control the illumination of the high beam indicator.

On vehicles with the optional HID headlamps, the HID electronic ballast module uses a high voltage Alternating Current (AC) output to activate the HID igniter integral to the lighting element to provide a high voltage surge, which creates a light arc between the lighting element electrodes. Once the electronic ballast module detects a suitably stable light arc, it switches over to a power-limiting mode to sustain the light arc. Also an electric motor drives a shutter within each HID lamp unit and the position of the shutter controls whether the low beams (shutter closed) or high beams (shutter open) are illuminated.

When the optical horn feature is selected, the low beams will shut OFF about 200 milliseconds after the high beams are activated. The TIPM also remembers which beams (LOW or HIGH) were selected when the headlamps were last turned OFF, and energizes those beams again the next time the headlamps are turned ON.

The TIPM 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 after the electronic ignition switch status messages from the WIN transition to LOCK. The EMIC and the TIPM each provide a fail-safe feature for the headlamps, which will cause the TIPM to turn the low beam headlamps ON automatically if there is no input available from the headlamp switch. The TIPM also provides a fail-safe feature for the headlamps that will turn the headlamps ON automatically whenever a loss of CAN bus communication is detected while the electronic ignition switch status messages from the WIN indicate the ignition ON position is selected. Each headlamp includes an integral reflector adjustment screw to be used for static aiming of the headlamps.

HEADLAMP DELAY

The headlamp delay feature includes the headlamp switch, the EMIC, the WIN and the TIPM. This feature has customer programmable delay intervals of 0 seconds (disabled), 30 seconds, 60 seconds and 90 seconds. If the headlamp switch remains in the headlamp ON position until the electronic ignition switch status messages from the WIN indicate the ignition OFF position is selected, then the headlamps will remain illuminated until after the selected delay interval has elapsed. The park lamps will not stay ON during the headlamp delay interval. The default delay interval is 90 seconds, but can be reprogrammed by the customer using the customer programmable features function of the Electronic Vehicle Information Center (EVIC).

HEADLAMP LEVELING

On vehicles with the HID headlamps, an automatic leveling system is used that includes front and rear axle sensors and an Automatic Headlamp Leveling Module (AHLM) located on the bottom of the right front lamp unit housing. A headlamp leveling motor located on the back of each HID lamp unit is mechanically connected through an integral pushrod to the adjustable headlamp reflector.

The automatic headlamp leveling system automatically adjusts the headlamp beam reflectors to compensate for changes in vehicle suspension height regardless of whether caused by the loading of the vehicle suspension or vehicle pitch changes caused by acceleration and deceleration. The actuator motors are automatically adjusted by the AHLM, which reads the front and the rear axle sensors to determine the suspension height changes. The circuitry of the AHLM provides a voltage signal to the electronic circuitry of both leveling actuator motors and the electronic circuitry of these stepper motors responds to the voltage inputs received from the AHLM to move the headlamp reflectors to the selected position.

The headlamp leveling motors have a path to ground at all times. The automatic headlamp leveling components operate on battery current received only when the exterior lighting and the ignition switch are turned ON.

PARK LAMPS

The park lamps system includes the EMIC, the TIPM and the headlamp switch on the instrument panel. The front park lamp and side marker or position lamp bulbs each have a path to ground at all times through their connection to the FEM wire harness. The FEM wire harness has takeouts with eyelet terminals that are secured by ground screws to the front end sheet metal within the engine compartment. The rear park lamp, side marker lamp and license plate lamp bulbs have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal within the passenger compartment.

The EMIC monitors a hard wired multiplex input from the headlamp switch, then sends the appropriate electronic headlamp switch status messages to the TIPM over the CAN data bus. The TIPM responds to these messages by providing a battery voltage output to the appropriate lamp bulbs through high side drivers on the front and rear, right and left park lamp feed circuits.

For domestic market vehicles, the TIPM 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 after the electronic ignition switch status messages from the WIN indicate the ignition LOCK position is selected. The EMIC provides a failsafe feature for the park lamps, which will send an electronic message to the TIPM to turn these lamps ON automatically if it detects no input from the headlamp switch. The TIPM also provides a fail-safe feature for the park lamps that will turn the headlamps and park lamps ON automatically whenever a loss of CAN bus communication is detected when the electronic ignition switch status messages from the WIN indicate the ignition ON position is selected.

REAR FOG LAMPS

Rear fog lamps are installed on vehicles manufactured for all export markets. The rear fog lamp system includes the headlamp switch, the EMIC and the TIPM. The rear fog lamps have a path to ground at all times through their connection to the rear fascia wire harness.

The EMIC monitors a hard wired multiplex input from the headlamp switch to determine whether the rear fog lamps are selected, then sends electronic rear fog lamp switch status messages to the TIPM over the CAN data bus. The TIPM responds to this message by providing a voltage output to the rear fog lamps. The TIPM also sends the appropriate electronic messages to the EMIC to illuminate or extinguish the rear fog lamp indicator.

The TIPM will automatically de-energize the rear fog lamps any time the front fog lamps are deselected or when the automatic headlamps feature turns the headlamps OFF. However, the rear fog lamps must always be turned ON manually, even after they’ve been turned OFF automatically. The TIPM 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 after the electronic ignition switch status messages from the WIN indicate the ignition LOCK position is selected.

SMARTBEAM® SYSTEM

The optional SmartBeam® (auto high beam) system includes the SmartBeam® module with digital imager camera and electronic circuitry integral to the electrochromic inside rear view mirror, the SCM, the TIPM, the EMIC, the EVIC, the headlamp switch and the multi-function switch. First, the Auto High Beams option must be enabled using the customer programmable features function of the EVIC. Then the A (Automatic) position must be selected using the rotary knob of the headlamp switch, the headlamp beam selector switch must be in the high beam position and the appropriate ambient light conditions must be present. Finally, the vehicle speed must be greater than 32 kilometers-per-hour (20 miles-per-hour).

Once all of these prerequisites have been met, the SmartBeam® camera and its circuitry within the electrochromic mirror automatically sends the appropriate electronic headlamp beam select switch status messages to the TIPM over the CAN data bus. The TIPM then responds to these messages by providing a pulse width modulated voltage output to the proper headlamp bulbs or the headlamp ballasts through the right and left low and high beam feed circuits to illuminate the headlamps. The TIPM also sends the appropriate electronic messages back to the EMIC to control the illumination of the high beam indicator.

The SCM continues to monitor the multi-function switch, and will send the appropriate electronic messages to the EMIC, which relays these messages to the SmartBeam® circuitry in the inside rear view mirror and to the TIPM to manually invoke the beam select switch momentary optical horn (flash-to-pass) feature or, when a detent switch position is selected to override SmartBeam® operation.

TRAILER TOW WIRING

In addition to the trailer tow wiring provisions, domestic market vehicles equipped with an optional trailer tow package include right and left trailer tow stop/turn relays installed in the TIPM. When the TIPM receives the appropriate inputs for normal turn signal, hazard warning or brake lamp operation, it responds by also energizing or de-energizing these trailer tow relays. When a trailer tow relay is energized, it provides battery voltage from a fused B(+) fuse to the trailer lamps through the trailer tow wiring to synchronize the illumination and flash rate of the trailer brake and turn signal lamps with those of the tow vehicle.

TURN SIGNAL LAMPS

The turn signal lamps system includes the SCM, the EMIC, the TIPM and the multi-function switch on the steering column. The front turn signal lamp bulbs each have a path to ground at all times through their connection to the Front End Module (FEM) wire harness. The FEM wire harness has takeouts with eyelet terminals that are secured by ground screws to the body sheet metal within the engine compartment. The rear turn signal lamp bulbs have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal within the passenger compartment. On vehicles with the optional outside rear view mirror lamp modules, the lamp modules receive a path to ground from their respective driver or passenger door module.

The SCM monitors a hard wired multiplex input from the multi-function switch to determine the status of the turn signal switch, then sends the appropriate electronic turn signal switch status messages to the TIPM over the CAN data bus. The TIPM responds to these messages by controlling a battery voltage output and the flash rate for either the right or left turn signal lamps. The TIPM also sends the appropriate electronic messages back to the EMIC to control the illumination and flash rate of the right or left turn signal indicators, as well as to control the click rate of an electromechanical relay soldered onto the EMIC electronic circuit board that emulates the sound emitted by a conventional turn signal flasher. On vehicles with the optional outside rear view mirror lamp modules, the TIPM also sends the appropriate electronic messages over the CAN bus to the driver and passenger door modules to control the illumination and flash rate of those lamps.

The EMIC also provides a turn signal ON warning that will generate repetitive chimes to indicate that a turn signal has been active continuously for 1.6 kilometers (1 mile) with the vehicle speed greater than 22 kilometersper- hour (15 miles-per hour). Vehicles built for markets other than the United States and Canada have a revised distance threshold of 4 kilometers (2.49 miles) for this feature. The chime will continue until the turn signal input becomes inactive or until the vehicle speed message indicates that the speed is less than 22 kilometers-per-hour (15 miles-per-hour), whichever occurs first.