Windshield Washer Motor: Description and Operation

Fig.8 Washer Reservoir:

FRONT WASHER PUMP/MOTOR
The front washer pump/motor unit is located on the inboard side and near the front of the washer reservoir, on the top of the left front fender wheel house in the engine compartment. A small permanently lubricated and sealed electric motor is coupled to the rotor-type washer pump. A seal flange with a barbed 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 forward pump mounting hole of the reservoir. The washer pump/motor unit is retained on the reservoir by the interference fit between the barbed pump nipple and the grommet seal, which is a light press fit. 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 headlamp and dash wire harness. The washer pump/motor is grounded at all times through a take out of the headlamp and dash wire harness with a single eyelet terminal connector that is secured under a ground screw to the radiator closure panel behind the left headlamp in the engine compartment. The front washer pump/motor receives battery current 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.

Fig.7 Washer Reservoir:

REAR WASHER PUMP/MOTOR
The rear washer pump/motor unit is located on the inboard side and near the rear of the washer reservoir, on the top of the left front fender wheel house in the engine compartment. A small permanently lubricated and sealed electric motor is coupled to the rotor-type washer pump. A seal flange with a barbed 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 rear washer pump/motor unit is always mounted in the rear pump mounting hole of the reservoir. The washer pump/motor unit is retained on the reservoir by the interference fit between the barbed pump nipple and the grommet seal, which is a light press fit. The rear washer pump/motor unit cannot be repaired. If faulty or damaged, the entire washer pump/motor unit must be replaced.

The rear washer pump/motor unit is connected to the vehicle electrical system through a single take out and two-cavity connector of the rear body wire harness. The washer pump/motor is grounded at all times through a take out of the rear body wire harness with a single eyelet terminal connector that is secured under a ground screw to the left cowl side inner panel below the instrument panel in the passenger compartment. The rear washer pump/motor receives battery current through the closed contacts of the momentary rear washer switch within the rear wiper and washer switch unit only when the bottom of the switch rocker is pushed towards the instrument panel. 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 rear washer plumbing, and the rear washer nozzle onto the lift-glass.