Grand Cherokee 2WD Limited V8-4.7L (2002)
Rear Wiper System Control Circuits
Rear Wiper System
Five circuits feed the rear wiper module. It has two high current circuits, battery (B+) and ground, that run the motor. The remaining three circuits
are low current control circuits.
Two of these circuits come from the rear wiper switch on the right multi-function switch stalk. These circuits are referred to as the rear wiper
motor control circuit and the rear wiper motor intermittent control circuit. When the rear wiper switch is in the Off position, both of these circuits
are open and the wiper module parks or remains parked. When the rear wiper switch is in the Intermittent position, the intermittent control circuit
is switched to ignition voltage, the motor control circuit is open and the wiper is in the intermittent modes. When the rear wiper switch is in the ON
position, the intermittent control circuit is open and the motor control circuit is switched to ignition voltage and the wiper is in continuous wipe
mode.
The third control circuit is the AJAR circuit. This circuit is fed by the flip-up glass ajar switch. When the flip-up glass is closed the ajar switch is
open and the rear wiper module functions normally. When the flip-up glass is open, the ajar switch is closed and the circuit provides ground to the
module. This ground signal indicates to the rear wiper module that it should park if operating or not allow operation if parked.
