1990 Voyager wiper issue

I have a 1990 Plymouth Voyager 3.3 litre with a windsheld wiper issue.

For some time now, the intermittent wipe hasn't worked (or only worked
intermittently ;-))) and the wipe after wash feature is driving me nuts
- it insists on wiping for nearly 10 wipes after a wash, usually
messing up the newly washed glass.

First - is the loss of intermittent wipe a problem with the motor (I've
tried replacing the under-dash module with a couple of others from
wrecked vehicles - no success)?

Second - is there a way of modifying the module's circuit so that it
only wipes say 2 or 3 times after spraying cleaner fluid on the glass?
A circuit diagram of the module would help me figure out how to change
the timing circuit, but my manual obviously doesn't provide such a
thing.

Dave

 

Well if it is not the module, then it must be another part of the
wiper electrical circuit. Could be the wiring harness itself or
perhaps the wiper switch on the column.

I am an adventurous sort, but there are some things I wont touch - and
underdash electrical (including steering column) is one of them. Take
it to a shop / mechanic that specializes in automotive electrical.

Oh, and let us know what it was once fixed.

 

Probably the combination switch (turn, headlight beam selector, hazard,
wiper). Not a difficult or particularly expensive part to replace. They
last amazingly well, considering they're made by Lucas (no foolin'!).
Second suspect: System grounds at the wiper motor and under the dash.

Not readily, no. I agree with you; that system does too many wipe cycles
after you trigger the screenwasher. Very annoying. My fix: find the
screenwasher wire where it comes off the combination switch connector at
the base of the steering column, and reroute it directly to the
screenwasher pump, bypassing the wiper control module. This way, YOU
control the wiping action. The disadvantage is a small one: Instead of
one-touch screenwashing, you must press the end of the stalk *and* rotate
it to one of the wiper-on positions. This is a much smaller annoyance than
the overly-helpful automatic implementation.

DS

 

The wiper motor has a park switch built into it, if the switch is bad it
could cause that exact problem. When you turn the wipers off from the switch
do the wipers always park at the bottom of the cowl like they are supposed
to?
Glenn Beasley
Chrysler Tech

 

Thanks for the suggestions. I will start looking at them.

The wipers always park at the right place. The intermittent wipe
seldom works (should I say it works "intermittently"?) though.

Dave