The wiper motor is most likely the problem, but to make sure the wiper linkage is not loose from the wiper transmission, it must be removed:
Disconnect the negative battery cable.
Remove the cowl vent grille and screen retainers
Remove the cowl vent grille and screen from the vehicle
Disconnect the wiper linkage from the wiper transmission
Unfasten the wiper motor retainers
Install the controller on the wiper motor and attach the motor wiring harness to the controller.
Place the wiper motor in position and install the two retaining screws. Do not tighten the screws until the wiper motor shaft is centered in the tailgate hole. Once the shaft is centered, tighten the screws to 57 inch lbs. (6.5 Nm).
Attach the wiper motor electrical connection, then install the end gate trim panel.
Install the spacer and nut onto the shaft and tighten the nut to 53 inch lbs. (6 Nm).
Install the wiper arm assembly and connect the negative battery cable. Check for proper motor operation.
Sunday, December 20th, 2009 AT 5:31 PM