2014 Jeep Wrangler JK Factory Service Manual 08 - Electrical

CHECK VALVE, Washer

FRONT

Diaphragm-type front washer system check valves are standard equipment in this vehicle. The check valves for the front washer system are integral to their respective front washer nozzles. (Refer to 08 - Electrical/8R - Wipers/Washers/NOZZLE, Washer/Description) .

REAR

The rear check valve (2) is located in the hardtop disconnect plate (1) located in the left inner D-pillar (3) of the removable hardtop. The disconnect plate provides a washer plumbing interconnect between the rear washer hose (4) contained within the body wire harness and the hardtop washer hose connected to the rear wiper motor. The disconnect plate also provides an electrical interconnect between the body wire harness and the hardtop wiring connected to the rear wiper motor.

The check valve consists of a molded white plastic valve body with a raised center flange and two raised wedge locks that secure the unit in the disconnect plate. A barbed outlet hose nipple is formed on the side of the valve body oriented toward the rear washer nozzle, and a straight inlet hose nipple is formed on the side of the valve body oriented toward the washer pump. Within the check valve body, a small check ball is held against an integral valve seat by a small coiled spring.

The rear check valve cannot be adjusted or repaired and, if ineffective or damaged, it must be replaced.

FRONT

Diaphragm-type front washer system check valves are standard equipment in this vehicle. The check valves for the front washer system are integral to their respective front washer nozzles. (Refer to 08 - Electrical/8R - Wipers/Washers/NOZZLE, Washer/Operation) .

REAR

The rear check valve provides more than one function in this application. It prevents washer fluid from draining out of the rear washer supply hoses back to the washer reservoir. This drain-back would result in a lengthy delay from when the rear washer switch is actuated until washer fluid was dispensed through the rear washer nozzle, because the washer pump would have to refill the rear washer plumbing from the reservoir to the nozzle. Such a drain-back condition could also result in water, dirt, or other outside contaminants being siphoned into the washer system through the washer nozzle orifice. This water could subsequently freeze and plug the nozzle, while other contaminants could interfere with proper nozzle operation and cause improper nozzle spray patterns. In addition, the rear check valve prevents washer fluid from siphoning out through the rear washer nozzle after the rear washer system is turned OFF.

When the washer pump pressurizes and pumps washer fluid from the reservoir through the rear washer plumbing, the fluid pressure unseats a check ball from a seat within the valve by overriding the pressure applied to the ball within the valve by a small coiled spring. With the check ball unseated, washer fluid is allowed to flow toward the rear washer nozzle. When the washer pump stops operating, the spring pressure on the check ball seats the ball in the valve and fluid flow in either direction within the rear washer plumbing is prevented.

REAR

  1. Disconnect and isolate the battery negative cable.

    2.  
  2. Unlatch and disconnect the body wire harness connector from the hardtop disconnect plate (1) connector receptacle located above the rear washer check valve (2) on the inner D-pillar (3) of the hardtop.

    3.  
  3. Disconnect the rear washer supply hose (4) from the straight inlet nipple of the rear check valve. A small quantity of washer fluid may drain from the disconnected hose.

    4.  
  4. Use a small screwdriver or a pocket knife to gently pry the latch features within each side of the disconnect plate pocket while pulling the plate away from the D-pillar.

    5.  
  5. Pull the hardtop disconnect plate away from the D-pillar far enough to access and disconnect the hardtop washer hose from the barbed outlet nipple on the back of the check valve. A small quantity of washer fluid may drain from the disconnected hose.

    6.  
  6. From the face of the disconnect plate, firmly grasp the straight nipple of the check valve and rotate it counterclockwise about 30 degrees to unlock it.

    7.  
  7. Pull the check valve straight out of the keyed opening in the disconnect plate.

    8.  

REAR

  1. Grasp the rear check valve by the straight nipple (2).

    2.  
  2. Align the check valve with the keyed opening within the pocket of the hardtop disconnect plate (1).

    3.  
  3. Insert the check valve into the disconnect plate until the flange is firmly seated.

    4.  
  4. Rotate the check valve about 30 degrees to lock it into place.

    5.  
  5. Reconnect the hardtop washer hose from the rear washer nozzle to the barbed outlet nipple on the back of the check valve.

    6.  
  6. Align the disconnect plate with the mounting hole in the inner D-pillar (3) of the hardtop and press it firmly and evenly until it snaps back into place.

    7.  
  7. Reconnect the washer supply hose (4) from the body wire harness to the straight inlet nipple of the check valve.

    8.  
  8. Reconnect and latch the body wire harness connector to the disconnect plate connector receptacle located above the check valve.

    9.  
  9. Reconnect the battery negative cable.

    10.