Most likely the wiper motor is bad the second wire sould be a ground if you set meter to ohms you sould be able to get a low resistance to any good ground on the vehicle if the hot wire is hot any time key is on the bcm is controling the ground to operate moter and you should have a steady continuity on the ground side with switch on the fast postion an it will read on and off in the intermitant postion if both wires test good motor is bad when you replace motor let it cycle and shut it off before installing the arm on it .
To remove the motor the procedure is as follows:--
REMOVAL
Disconnect and isolate the battery negative cable.
Remove the rear wiper arm from the rear wiper motor output shaft.
From the outside of the liftgate, remove the rear wiper motor output shaft nut (Rear Wiper Module Remove/Install).
Pull the rear wiper motor output shaft bezel and rubber gasket away from the liftgate far enough to access and disconnect the washer supply hose from the barbed nipple on the back side of the bezel.
Remove the bezel and rubber gasket from the wiper motor output shaft.
Remove the trim panel from the inside of the lift-gate.
Disconnect the liftgate wire harness connector for the rear wiper module from the module connector receptacle.
Remove the two screws that secure the rear wiper module mounting bracket to the liftgate inner panel.
Remove the rear wiper module and mounting bracket from the liftgate as a unit.
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