WTB Rear wiper motor

Post by **JRL** » 01 Dec 2017, 14:41

I need a known good, working rear wiper motor for a 98-2000 (mine is a 2000) wagon.
Mine works but does not "park". It just stops wherever it happens to be when it's turned off. .All the wiring seems to be fine all the way up into the roof so we deduced that it's the motor.

Post by **jimmy57** » 01 Dec 2017, 15:25

If you're feeling adventuresome you can take out the motor and remove the galvanized gearbox cover and clean corrosion where the park contact touches motor cover. That is usually what causes this.
The 850 wagon tgate wiper motors are the same too if anyone has one in inventory.

Post by **JRL** » 01 Dec 2017, 21:37

Thanks

Post by **BEJinFbk** » 02 Dec 2017, 19:50

There are two power feeds to the wiper.
Sounds like the one that parks it may have failed.
Get beyond the hatch hinge harness and check.

DrJammer · Post by **DrJammer** » 05 Dec 2017, 08:40

I have a 2000XC that used to have the same problem, the rear wiper arm would stop wherever it was when I turned the switch. I also have no rear defrost and the trunk open light is always on.

I was in the rear pillar wires and ended up cutting and butt jointing every wire in the bunch. Still no defrost and trunk light is still on. But it fixed the rear wiper parking issue.

My opinion is it is actually a wire and not the motor

Post by **abscate** » 19 Dec 2017, 04:18

From reading this thread it sounds like the rear wiper parks by control and not by points in the motor assembly?

Wow.....

Looked at wiring diagram and convinced myself that is NOT the case - park control is in the motor - just like jimmy says..

I should abbreviate that to JLJS - would save a lot of typing here

Post by **E Showell** » 22 Dec 2017, 21:09

Jim. I have a motor you can have. Only problem is I do not know if it works. Happy to send along for you to try. Pm your mailing address and I'll pop it in the mail.

Post by **jimmy57** » 22 Dec 2017, 22:26

The motor runs constant by power feed supplied by turning on switch (RUN supply). Motor parks because the second feed is there and runs it once the RUN feed is turned off by switch. The park feed through switch is there any time ignition is on. If you added intermittent relay then all it does is pulse the RUN wire .8 second to get motor out of the park position and park feature will sweep the arm one cycle. Count for the next sweep commences once the power is interrupted on park circuit since the park feed is fed back through RUN wire to your intermittent relay. P2 has timer in CEM and regular relays.
PI, P3, P5 have wiper motor modules (WMM) with brushless motors with motor rotation counter and electronics. Park is learned by physical stop on motor. Motor does not do a full arm rotation as was done for decades. The motor runs the prescribed count and then is reversed to sweep back but does not go the same count back as the park position is further down below brow of the hood. The WMM has a bit of adaptivity to account of ice dam at end of sweep by windshield post. If motor current goes high then the count in that direction can be decreased a few rotations. Not so much to really notice but if wiper travel decreases 3/4 inch that usually is enough to get out of the ice zone where heat loss to wind of outer metal of post can keep the windshield in that area too cold to be thawed. WMM also can stop if wiper arm is frozen via the current monitoring and not have to rely on stripping the taper of the wiper arm as the "fuse" to protect the motor and linkage.