Rear Windshield wiper

[vex]

Originally Posted by Ender

wrong polarity? not enough amps? stuck?

I thought there might be something wrong with the amps... but that just doesn't make sense as all of that is still stock. I doubt it's stuck either as the motor itself is straight from the dealership.

Originally Posted by Pete_89T2

Just curious as to how you checked the voltage at the rear wiper motor's plug, because the '89 FSM (ref. page S-40) omits a very important step that would make it impossible to measure ANY voltage at the motor plug -- you need to do this test with the hatch FULLY CLOSED to complete the wiring circuit that is made by the contacts on the hatch strut. If you're measuring voltage at the motor's plug, which is revealed only after you remove the plastic trim piece covering the motor then you obviously figured this out for yourself.

Yup.

The schematic diagram shown on page S-39 of the '89 FSM shows a normally open, single pole, single throw switch, wired between one leg of the motor and ground. This leg of the motor also connects to the intermittent wiper relay in the cluster switch. Appears that switch is a limit switch, probably built in to the motor and there to reverse the motor's polarity each time it reaches the end of its travel.

Did you try the "Checking Wiper Motor" test on the bottom of page S-40? This test has you jumper +12V to the LG/Y terminal of the motor, and jumper the B/R terminal wire to ground, motor is supposed to turn. If that fails, FSM refers you to page T-25 to test the rear wiper & washer switch.

I'll have to check that out. Is that the Body electrical book?