Grand Cherokee 2WD Limited V8-4.7L (2002)
Windshield Washer Pump: Description and Operation
Fig.5 Washer Pumps (Viewed From Bottom Of Reservoir)
FRONT WASHER PUMP/MOTOR
The front washer pump/motor unit is located on the outboard side and near the front of the washer reservoir, between the left front inner and outer
fender panels. A small permanently lubricated and sealed electric motor is coupled to the rotor-type washer pump. A seal flange with a large
barbed inlet nipple on the pump housing passes through a rubber grommet seal installed in one of two dedicated mounting holes near the bottom of
the washer reservoir. The front washer pump/motor unit is always mounted in the lower pump mounting hole of the reservoir. A smaller barbed
outlet nipple on the pump housing connects the unit to the front washer hose. The washer pump/motor unit is retained on the reservoir by the
interference fit between the barbed pump inlet nipple and the grommet seal, which is a light press fit. An integral electrical connector receptacle is
located on the top of the motor housing. The front washer pump/motor unit cannot be repaired. If faulty or damaged, the entire washer pump/motor
unit must be replaced.
The front washer pump/motor unit is connected to the vehicle electrical system through a single take out and two-cavity connector of the left
headlamp and dash wire harness. The washer pump/motor is grounded at all times through a take out of the left headlamp and dash wire harness
with a single eyelet terminal connector that is secured under a ground screw to the top of the left inner fender shield in the engine compartment.
The front washer pump/motor receives battery current on a fused ignition switch output (run-acc) circuit through the closed contacts of the
momentary front washer switch within the right multi-function switch only when the switch control stalk is pulled towards the steering wheel.
Washer fluid is gravity-fed from the washer reservoir to the inlet side of the washer pump. When the pump motor is energized, the rotor-type pump
pressurizes the washer fluid and forces it through the pump outlet nipple, the front washer plumbing, and the front washer nozzles onto the
windshield glass.
