Rear wiper stopped working

My 2004 expedition had same problem, if you take apart the shaft that goes thru the glass it will be full of dirt, clean ,lubricate and reinstall, you may have to replace the O-ring on the shaft. a 20 minute job, very easy fix

Usually this is the wiper motor. Also check the lift gate glass actuator. OPen & close the liftgate glass a few times to see if that's it.

Intermittent Rear Window Wiper System
The rear window wiper intermittent speed is activated when the rear window wiper motor module receives ground controlled by the multifunction switch inputs to the rear window wiper motor module. The rear window wiper motor module then activates the rear window wiper relay (internal). This activates the rear window wiper motor by providing voltage from the battery junction box (BJB). Once the rear window wiper motor is activated, its internal run/park switch connects voltage to the motor, keeping it operating. When the rear window wiper motor returns to the park position, the run/park switch disconnects voltage internally from the wiper motor input. The rear window wiper remains parked until the rear window wiper motor module completes a time-out and then repeats the cycle.

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• The rear window wiper is inoperative

• Multifunction switch.
• Circuitry.
• Ignition switch.
• Rear window wiper motor.

• Go To Pinpoint Test B .