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Concentrate on the "no park" issue first. With all wires connected, ignition switched ON, wipers switched OFF, and wipers in the "up" position, use an incandescent test light clipped to a verified good ground and probe both gray wires at the w/w motor. Are both gray wires live? Probe the blk/lt blu wire at the w/w motor - is it live? Reconnect the test light so it is clipped to B+ and reprobe the blk/lt blu wire. Does the test light illuminate?
Regardless of the number of wiper motors you've tried, the "park" problem is the park switch inside the wiper motor. The gray wires testing live indicates that the wiper motor circuit is complete all the way up to the two-wire park switch connector. Both tests of the blk/lt blu wire indicate that the park circuit is complete between the park switch and ground via the wiper switch. That leaves the park switch and its connections inside the w/w assembly as the culprit causing no park. A faulty park switch will also cause "mist" to malfunction and not park.
Quote from: bd on October 14, 2018, 06:06:14 PMRegardless of the number of wiper motors you've tried, the "park" problem is the park switch inside the wiper motor. The gray wires testing live indicates that the wiper motor circuit is complete all the way up to the two-wire park switch connector. Both tests of the blk/lt blu wire indicate that the park circuit is complete between the park switch and ground via the wiper switch. That leaves the park switch and its connections inside the w/w assembly as the culprit causing no park. A faulty park switch will also cause "mist" to malfunction and not park.If you're skeptical and wish to verify this ^^^^, with ignition ON, wipers OFF unplug the two-wire connector (gry and blk/lt blu pair) from the w/w motor and jumper the wire pair together, bypassing the park switch. Do the wipers run on low speed?Yes - the park switch is missing or faulty OR there is a continuity problem through the connector terminals.No - there is excessive resistance in the gry or blk/lt blu wires and further tests are needed.
According to this, if the wiper still runs with the park switch removed, there is likely a short in the low or high speed circuit.
Using a fused test light, I probed the low and high connection at the motor. I get full brightness on power in (obvious), I get very dim light when probing the low side (wipers on low) and a slightly brighter (half brightness) light when probing high (wipers still on low) Wipers have appeared to completely stop working on high now.