Grand Cherokee 2WD V8-4.7L Flex Fuel (2008)
operation.
The rear wiper motor park switch is a single pole, single throw, momentary switch within the wiper motor that is mechanically actuated by the wiper
motor transmission components. The park switch alternately closes and opens a path to ground for the rear wiper motor control circuit input to the wiper
motor electronic controls, depending upon the position of the rear wiper blade on the liftgate glass.
The motor control electronics also monitor a hard wired input from the liftgate flip-up glass ajar switch to determine whether the glass is opened or
closed. These inputs allow the electronic logic circuits to control all of the electronic features of rear wiper motor operation and to keep the motor
energized long enough to complete its current wipe cycle and park the wiper blade after the wiper system or the ignition switch has been turned OFF, or
when the liftgate flip-up glass has been opened.
The rear wiper motor is grounded at all times through a take out with an eyelet terminal connector in the body wire harness that is secured to a ground
location in the passenger compartment. The automatic resetting circuit breaker protects the motor from overloads. The rear wiper motor transmission
converts the rotary output of the wiper motor to the back and forth wiping motion of the rear wiper arm and blade on the liftgate flip-up glass.
The hard wired inputs and outputs of the rear wiper motor may be diagnosed using conventional diagnostic tools and procedures. Refer to the
appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the rear wiper motor or the
electronic controls or communication between other modules and devices that provide some features of the rear wiper and washer system. The most
reliable, efficient, and accurate means to diagnose the rear wiper motor or the electronic controls and communication related to rear wiper motor
operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
