Jeep WK Grand Cherokee Lamps & Lighting

By Jeep Experts

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Exterior lighting – technical descriptions

AUTOMATIC HEADLAMPS

The non-obligatory automated headlamp (auto low) system consists of the Steering Control Module (SCM), the Front Control Module (FCM), the left (lighting) multi-function change and, relying upon automobile tools both the solar load sensor on the highest of the instrument panel or the Rain Sensor Module (RSM) on the within of the windshield beneath the electrochromic inside rear view mirror mounting button. First, the Auto Low choice should be enabled utilizing the shopper programmable options operate of the Electronic Vehicle Information Center (EVIC). Then the A (Automatic) place should be chosen utilizing the left multi-function change.

Once these stipulations have been met, the SCM responds by sending the suitable digital lighting request messages to the FCM over the Controller Area Network (CAN) information bus and, both the solar load sensor gives an ambient mild stage enter to the ElectroMechanical Instrument Cluster (EMIC) (also called the Cab Compartment Node/CCN) which is relayed to the FCM over the CAN information bus, or the RSM gives digital ambient mild stage messages to the FCM over the CAN information bus. With the engine operating, the FCM responds to those messages by routinely controlling a pulse width modulated voltage output to the chosen headlamp bulbs via the fitting and left low beam feed circuits to light up the headlamps. The FCM additionally sends the suitable digital messages again to the EMIC to manage the illumination of the excessive beam indicator.

BACKUP LAMPS

The backup (or reverse) lamps have a path to floor always via a takeout and eyelet terminal of the physique wire harness that’s secured by a floor screw to the physique sheet metallic. The PCM regularly displays a tough wired multiplex enter from the Transmission Range Sensor (TRS), then sends the correct digital transmission gear selector standing messages to different digital modules over the CAN information bus. Whenever the ignition change is within the ON place and the FCM receives an electronic mail indicating the standing of the transmission gear selector is REVERSE, it gives a battery voltage output to the backup lamps on the backup lamp feed circuit.

BRAKE LAMPS

The brake (or cease) lamps and the Center High Mounted Stop Lamp (CHMSL) every have a path to floor always via a takeout and eyelet terminal of the physique wire harness that’s secured by a floor screw to the physique sheet metallic throughout the passenger compartment. The brake lamps and CHMSL obtain battery voltage on the brake lamp change feed circuit when the brake lamp change is closed by the brake pedal arm. The CHMSL and brake lamps are linked to a tough wired output from the brake lamp change. On automobiles so outfitted, the brake lamp operate of the trailer tow cease/flip relays is managed by an output from the FCM primarily based upon a tough wired enter from the brake lamp change.

DAYTIME RUNNING LAMPS

Canada

2005-up WK Grand Cherokee automobiles manufactured on the market in Canada illuminate the excessive beam headlamp bulb in every entrance lamp unit at a diminished depth to function the Daytime Running Lamps (DRL).

Vehicles manufactured on the market in Canada illuminate the excessive beam filament of each headlamp bulbs at a diminished depth when the engine is operating, the parking brake is launched, the automated transmission gear selector will not be within the PARK place and the outside lamps are turned OFF. The FCM should be programmed appropriately for this characteristic to be enabled. Once enabled, anytime the FCM receives digital messages over the CAN information bus from the Powertrain Control Module (PCM) indicating the engine is operating, from the SCM indicating the standing of the left (lighting) multi-function change enter is within the OFF or A (Automatic) positions and from the EMIC indicating that the parking brake lever is launched, the FCM gives a pulse width modulated voltage output to the headlamp excessive beam bulb filaments via the fitting and left excessive beam feed circuits to provide illumination at a diminished depth.

U.S.A.

U.S. fleet automobiles illuminate the low beam headlamp bulb in every entrance lamp unit to function DRL. Officially, non-fleet U.S. Grand Cherokee WK’s usually are not licensed to have the DRL characteristic enabled. However, we now have confirmed that some house owners have had this performed at their seller. All that was required was easy reprogramming through the DRB scan instrument.

FRONT FOG LAMPS

Vehicles outfitted with non-obligatory entrance fog lamps embody a entrance fog lamp relay put in within the Integrated Power Module (IPM), and a entrance fog lamp change integral to the left (lighting) multi-function change on the steering column. The entrance fog lamps have a path to floor always via their connection to the headlamp and sprint wire harness. The headlamp and sprint wire harness has takeouts with eyelet terminals which might be secured by floor screws to the entrance finish sheet metallic throughout the engine compartment. The SCM displays a tough wired multiplex enter from the left multi-function change to find out whether or not the fog lamps are chosen, then sends digital entrance fog lamp request messages to the FCM over the CAN information bus.

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When the FCM receives a entrance fog lamp request message it then controls entrance fog lamp operation by energizing or de-energizing the entrance fog lamp relay management coil. The FCM additionally sends the suitable electronic mail to the EMIC to light up or extinguish the entrance fog lamp indicator. When the entrance fog lamp relay is energized, it gives battery voltage from a fused B(+) fuse within the IPM to the fog lamps via the fog lamp relay output circuit. In automobiles manufactured for home markets, the FCM will routinely de-energize the entrance fog lamp relay any time the headlamp excessive beams are chosen.

The FCM additionally gives a battery saver (load shedding) characteristic for the entrance fog lamps, which is able to flip these lamps OFF if they’re left ON for greater than about eight minutes with the ignition change within the LOCK place. The FCM will even flip OFF the entrance fog lamps if it detects that system voltage is lower than 11.75 volts for greater than about 30 seconds, and can return the entrance fog lamps to regular operation when it detects that system voltage is larger than 13.0 volts for greater than about 30 seconds.

Each entrance fog lamp consists of an integral adjustment screw for use for static aiming of the fog lamp beams.

HAZARD WARNING LAMPS

The hazard warning system consists of the EMIC, the FCM and the hazard change on the SCM on the steering column. The FCM displays a tough wired enter from the hazard change to find out the standing of the hazard change. The FCM responds to this enter by controlling a battery voltage output and the flash fee for every of the fitting and left flip sign lamps. The FCM then sends the suitable digital hazard change standing messages to the EMIC over the CAN information bus to manage the illumination and flash fee of the fitting and left flip sign indicators, in addition to to manage the clicking fee of an electromechanical relay soldered onto the EMIC digital circuit board that emulates the sound emitted by a standard hazard warning flasher. Although the hazard change is mounted to the SCM, the hazard change circuits solely move via the SCM. The SCM has no management over and doesn’t monitor the hazard change output.

HEADLAMPS

The headlamp system consists of the SCM, the EMIC, the FCM, and the left (lighting) multi-function change on the steering column. The headlamp bulbs have a path to floor always via their connection to the headlamp and sprint wire harness. The headlamp and sprint wire harness has takeouts with eyelet terminals which might be secured by floor screws to the entrance finish sheet metallic throughout the engine compartment.

The SCM displays a tough wired multiplex enter to find out the standing of the left multi-function change and whether or not the headlamp excessive or low beams are chosen. The SCM then sends the suitable digital headlamp change and headlamp beam choose change standing messages to the FCM over the CAN information bus. The FCM responds to those messages by offering a pulse width modulated voltage output to the correct headlamp bulbs via the fitting and left high and low beam feed circuits to light up the chosen headlamp beams. The FCM additionally sends the suitable digital messages to the EMIC to manage the illumination of the excessive beam indicator.

The FCM additionally remembers which beams (LOW or HIGH) have been chosen when the headlamps have been final turned OFF, and energizes these beams once more the following time the headlamps are turned ON. The FCM gives a battery saver (load shedding) characteristic for the headlamps, which is able to flip these lamps OFF if they’re left ON for greater than about eight minutes with the ignition change within the LOCK place. The SCM gives a fail-safe characteristic for the headlamps, which is able to ship an electronic mail to the FCM to show the low beam headlamps ON routinely if the SCM detects no enter from the left multi-function change. The FCM additionally gives a fail-safe characteristic for the headlamps that may flip the headlamps ON routinely every time a lack of CAN bus communication is detected with the ignition change within the ON place.

Each headlamp consists of an integral reflector adjustment screw for use for static aiming of the headlamps.

HEADLAMP LEVELING

In sure markets the place required, a headlamp leveling system is offered on the automobile. The headlamp leveling system consists of distinctive entrance lamp models outfitted with a headlamp leveling actuator motor, and a slider-actuated headlamp leveling change within the higher change pod on the instrument panel. The headlamp leveling system permits the headlamp beams to be adjusted to one in every of 4 vertical positions to compensate for modifications in inclination brought on by the loading of the automobile suspension.

The leveling motors are mechanically linked via an integral pushrod to the adjustable headlamp reflector. The headlamp leveling change is a resistor multiplexed unit that gives one in every of 4 voltage outputs to the headlamp leveling motors. The headlamp leveling motors will transfer the headlamps to the chosen place primarily based upon the voltage enter obtained from the change. The headlamp leveling motors and change have a path to floor always. The headlamp leveling elements function on battery voltage obtained via the fused park lamp relay output circuit in order that the system will solely function when the outside lighting is turned ON.

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PARK LAMPS

The park lamps system consists of the SCM, the EMIC, the FCM, a park lamp relay put in within the IPM, and the left (lighting) multi-function change on the steering column. The entrance park lamp and facet marker or place lamp bulbs every have a path to floor always via their connection to the headlamp and sprint wire harness. The headlamp and sprint wire harness has takeouts with eyelet terminals which might be secured by floor screws to the entrance finish sheet metallic throughout the engine compartment. The rear park lamp, facet marker lamp and license plate lamp bulbs have a path to floor always via a takeout and eyelet terminal of the physique wire harness that’s secured by a floor screw to the physique sheet metallic throughout the passenger compartment.

The SCM displays a tough wired multiplex enter from the left multi-function change, then sends the suitable digital headlamp change standing messages to the FCM over the CAN information bus. The FCM responds to those messages by energizing or de-energizing the park lamp relay. When the park lamp relay is energized, it gives battery voltage via a park lamp relay output circuit and fuses within the IPM to the suitable lamp bulbs. The FCM and SCM additionally ship the suitable digital messages to the EMIC to manage the illumination and lighting stage of the panel lamps.

The FCM gives a battery saver (load shedding) characteristic for the park lamps, which is able to flip these lamps OFF if they’re left ON for greater than about eight minutes with the ignition change within the LOCK place. The SCM gives a fail-safe characteristic for the park lamps, which is able to ship an electronic mail to the FCM to show these lamps ON routinely if the SCM detects no enter from the left multi-function change. The FCM additionally gives a fail-safe characteristic for the headlamps that may flip the headlamps ON routinely every time a lack of CAN bus communication is detected with the ignition change within the ON place.

REAR FOG LAMPS

Rear fog lamps are put in on automobiles manufactured for sure markets the place they’re required. The rear fog lamp system features a rear fog lamp relay put in within the IPM, and a rear fog lamp change integral to the left (lighting) multi-function change on the steering column on automobiles with out the automated headlamps choice, or integral to the higher instrument panel change pod on automobiles additionally outfitted with the automated headlamps choice. The rear fog lamps have a path to floor always via their connection to the rear fascia wire harness.

On automobiles with out automated headlamps, the SCM displays a tough wired multiplex enter from the left multi-function change to find out whether or not the rear fog lamps are chosen, then sends digital rear fog lamp request messages to the FCM over the CAN information bus. On automobiles with automated headlamps, the ElectroMechanical Instrument Cluster (EMIC) (also called the Cab Compartment Node/CCN) displays an enter obtained from the rear fog lamp change within the higher instrument panel change pod to find out when the rear fog lamps are chosen or deselected, then sends digital rear fog lamp change standing messages to the SCM over the CAN information bus. The SCM then sends digital rear fog lamp request messages to the FCM over the CAN information bus. When the FCM receives a rear fog lamp request message it controls rear fog lamp operation by energizing or de-energizing the rear fog lamp relay management coil.

The FCM additionally sends the suitable digital messages again to the EMIC to light up or extinguish the rear fog lamp indicator. When the rear fog lamp relay is energized, it gives battery voltage from a fused B(+) fuse within the IPM to the rear fog lamps via the rear fog lamp relay output circuit.

The FCM will routinely de-energize the rear fog lamp relay any time the entrance fog lamps are deselected or when the automated headlamps characteristic turns the headlamps OFF. However, on automobiles with the automated headlamps choice, the rear fog lamps should all the time be turned ON manually, even after they’ve been turned OFF routinely. The FCM additionally gives a battery saver (load shedding) characteristic for the rear fog lamps, which is able to flip these lamps OFF if they’re left ON for greater than about eight minutes with the ignition change within the LOCK place.

On automobiles with a factory-installed trailer towing bundle together with the Trailer Module (TM), the FCM will suppress operation of the rear fog lamps on the automobile every time a trailer is linked, whereas the TM operates the rear fog lamps on the trailer.

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SMARTBEAM® SYSTEM

The non-obligatory SmartBeam® (auto excessive) system consists of the SmartBeam® module with digital imager digital camera and digital circuitry integral to the electrochromic inside rear view mirror, the SCM, the FCM, the EMIC, the Electronic Vehicle Information Center (EVIC) and the left (lighting) multi-function change. First, the Auto Low/High choice should be enabled utilizing the shopper programmable options operate of the EVIC. Then the A (Automatic) place should be chosen utilizing the left multi-function change. Finally, the automobile velocity should be larger than 32 kilometers-per-hour (20 miles-per-hour).

Once all of those stipulations have been met, the SmartBeam® digital camera and its circuitry throughout the electrochromic mirror routinely sends the suitable digital headlamp beam choose change standing messages to the FCM over the CAN information bus. The FCM then responds to those messages by offering a pulse width modulated voltage output to the correct headlamp bulbs via the fitting and left high and low beam feed circuits to light up the headlamps. The FCM additionally sends the suitable digital messages to the EMIC to manage the illumination of the excessive beam indicator.

The SCM continues to observe the left multi-function change, and can ship the suitable digital messages to the SmartBeam® circuitry within the inside rear view mirror and to the FCM to manually invoke the beam choose change momentary optical horn (flash-to-pass) characteristic or, when a detent change place is chosen to override SmartBeam® operation.

TRAILER TOW WIRING

In addition to the trailer tow wiring provisions, automobiles outfitted with an non-obligatory trailer tow bundle embody proper and left trailer tow cease/flip relays put in within the IPM. When the FCM receives the suitable inputs for regular flip sign, hazard warning or brake lamp operation, it responds by additionally energizing or de-energizing these trailer tow relays. When a trailer tow relay is energized, it gives battery voltage from a fused B(+) fuse to the trailer lamps via the trailer tow wiring to synchronize the illumination and flash fee of the trailer brake and switch sign lamps with these of the tow automobile.

In sure export markets, as a substitute of trailer tow relays automobiles outfitted with a factory-installed trailer towing bundle have a Trailer Module (TM). The TM gives the suitable outputs to the trailer electrical system via the trailer tow connector primarily based upon each onerous wired inputs from the automobile electrical system and messages obtained from the FCM over the CAN information bus. The TM additionally displays the situation of the trailer lighting via circuit resistance and gives each visible and audible suggestions to the automobile operator by sending messages again to the FCM which improve flip sign flash and click on charges when an issue is detected. The TM messages the FCM when the trailer wiring is linked, then the FCM suppresses operation of the rear fog lamps on the automobile whereas the TM implements operation of the rear fog lamps on the trailer.

TURN SIGNAL LAMPS

The flip sign lamps system consists of the SCM, the EMIC, the FCM and the left (lighting) multi-function change on the steering column. The entrance flip sign lamp bulbs every have a path to floor always via their connection to the headlamp and sprint wire harness. The headlamp and sprint wire harness has takeouts with eyelet terminals which might be secured by floor screws to the physique sheet metallic throughout the engine compartment. The rear flip sign lamp bulbs have a path to floor always via a takeout and eyelet terminal of the physique wire harness that’s secured by a floor screw to the physique sheet metallic throughout the passenger compartment.

The SCM displays a tough wired multiplex enter from the left multi-function change to find out the standing of the flip sign change, then sends the suitable digital flip sign change standing messages to the FCM over the CAN information bus. The FCM responds to those messages by controlling a battery voltage output and the flash fee for both the fitting or left flip sign lamps. The FCM additionally sends the suitable digital messages to the EMIC to manage the illumination and flash fee of the fitting or left flip sign indicators, in addition to to manage the clicking fee of an electromechanical relay soldered onto the EMIC digital circuit board that emulates the sound emitted by a standard flip sign flasher.

The EMIC additionally gives a flip sign ON warning that may generate repetitive chimes to point {that a} flip sign has been lively constantly for 1.6 kilometers (1 mile) with the automobile velocity larger than 22 kilometers-per-hour (15 miles-per hour). Vehicles constructed for markets aside from the United States and Canada have a revised distance threshold of 4 kilometers (2.49 miles) for this characteristic. The chime will proceed till the flip sign enter turns into inactive or till the automobile velocity message signifies that the velocity is lower than 22 kilometers-per-hour (15 miles-per-hour), whichever happens first.

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