Jeep WK Grand Cherokee Headlamp Washer System

By Jeep Experts

Welcome to the in-depth web page on the WK Generation Jeep Grand Cherokee headlamp washer system. Did we miss something? Please get in contact with us and inform us about it!

Vehicles outfitted with the non-obligatory headlamp washer system have two hydraulically actuated telescopic headlamp washer nozzles, one beneath every entrance lamp unit. When not in use, these nozzle models are retracted beneath the entrance fascia beneath every entrance lamp unit the place they’re hid by a trapezoid-like molded plastic cowl that snaps onto the higher finish of the nozzle.


The headlamp washer system is designed to offer the automobile operator with a handy, secure, and dependable technique of sustaining High Intensity Discharge (HID) headlamp lighting efficiency. The numerous parts of this technique are designed to transform electrical vitality produced by the automobile electrical system into the hydraulic motion of the washer system to use washer fluid saved in an on-board reservoir to the lenses of the 2 entrance lamp models, eradicating extra accumulations of snow, ice, bugs, mud, or different minor particles from the entrance lamps that is perhaps encountered whereas driving the automobile underneath quite a few kinds of inclement working circumstances.

The automobile operator initiates the headlamp washer system perform utilizing the management knob on the top of the suitable multi-function change management stalk that extends from the suitable aspect of the steering column, just under the steering wheel. While the HID headlamps are turned ON, pushing the knob on the top of the management stalk in the direction of the steering column past the actuation level for greater than about 100 milliseconds (0.10 second) prompts the headlamp washer pump/motor together with the entrance washer pump/motor. When the headlamp washer pump/motor unit is energized, hydraulic strain builds inside the headlamp washer system plumbing in opposition to the strain of the return spring in every headlamp washer nozzle. Sufficient strain causes the headlamp washer nozzles to telescope outward and to dispense excessive strain washer fluid onto the lenses of each entrance lamp models for about 1600 milliseconds (1.6 seconds).

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Headlamp washer system operation is totally managed by the Front Control Module (FCM) logic circuits based mostly upon digital wash command message inputs acquired from the ElectroMechanical Instrument Cluster (EMIC) (often known as the Cab Compartment Node/CCN) over the Controller Area Network (CAN) information bus. The EMIC screens digital wash change standing and lighting change standing message inputs acquired over the Local Interface Network (LIN) information bus from the Steering Control Module (SCM) (often known as the steering column module) based mostly upon the suitable and left multi-function change positions. The FCM will solely enable this technique to function when the ignition change is within the ON place and the headlamp low beams are turned ON. The FCM makes use of a excessive aspect driver to energise or de-energize the headlamp washer system relay which, in flip, controls the operation of the headlamp washer pump/motor unit.

The arduous wired circuits and parts of the headlamp washer system could also be identified utilizing standard diagnostic instruments and procedures. Refer to the suitable wiring info. However, standard diagnostic strategies is not going to show conclusive within the prognosis of the headlamp washer system or the digital controls or communication between different modules and units that present some options of the headlamp washer system. The most dependable, environment friendly, and correct means to diagnose the headlamp washer system or the digital controls and communication associated to headlamp washer system operation requires using a diagnostic scan device.

Headlamp washers have been initially scheduled to be out there with HID headlamps on 2010 fashions of the Grand Cherokee in north america, however the function has been cancelled and can most definitely seem on the all-new 2011 mannequin.

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