Wipers won't stop - Chevy Impala SS Forum
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post #1 of 20 (permalink) Old 02-16-2018, 04:52 PM Thread Starter
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Wipers won't stop

I have an intermittent problem with the wipers. Sometimes when I wash the windshield they won''t stop wiping until I pull the fuse or turn off the ignition. After I spend some time trying to figure out where the problem is, they start working normally. I figure the problem is either with the wiper switch or the wiper motor assembly. I searched this forum for a trouble isolating procedure and did not find one. I found a circuit diagram for the wiper on this forum and I have studied it, but I can't make sense of how the park relay arm controls the several contacts that are connected to it by dotted lines and the solid state timer relay. I would like to know how to tell if the defective part is the switch or the motor assembly. My Haynes manual says if they won't stop, disconnect the wiring from the wiper control switch and if they stop, replace the switch. If they keep running, replace the motor. That does not make sense because if you disconnect the wiring that connects the switch to the motor, it is always going to stop because it can not get power. Haynes does not say which end of the wiring to disconnect, the switch end or the motor end but it looks to me like the motor is going to stop no matter which end is disconnected. The parts are expensive and difficult to install, so I want to know which is defective before I replace it. I tried to drag my copy of the circuit diagram to this post but it would not work.
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post #2 of 20 (permalink) Old 02-16-2018, 05:13 PM
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when you pull the fuse and or pull the connector to the wiper motor assy ya gonna stop but when you plug it all back the wiper will park that means most all the time the circuit board is messed up...

sometimes need solder or replace..

so if it continues to F up after doing the first procedure then the wiper stick switch is bad on the steering column.

IMO wiper motor assy.. probably not..

Last edited by j cat; 02-20-2018 at 02:42 PM.
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post #3 of 20 (permalink) Old 02-16-2018, 05:24 PM
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so now I remember this is a tough to find new part .. FRED may have some used ones .. good luck..

control board ..
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post #4 of 20 (permalink) Old 02-16-2018, 06:45 PM Thread Starter
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Quote:
Originally Posted by j cat View Post
when you pull the fuse and or pull the connector to the wiper motor assy ya gonna stop but when you plug it all back the wiper will park that means most all the time the circuit board is messed up...

sometimes need solder or replace..

so if it continues to F up after doing the first procedure then the wiper stick switch is bad on the steering column.

IMO wiper motor assy.. probably..
I can not remember if it started working normally as soon as I replaced the fuse. I don't think so. I will have to experiment with it to get a pattern of behavior. It's hard to test if it is not raining. I may have to remove the wiper arms or find a way to replace the wiper blades with little wheels. Do I have to remove the motor to work on this circuit board?
I tried again to post the circuit diagram and I think it worked this time.
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post #5 of 20 (permalink) Old 02-16-2018, 08:59 PM
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97% chance it is the black wiper motor control on the motor. I may have one. I have had a run on them of late. I will check. If you have a junk yard near you, any one that looks like the one on your car will work. They used the same part on a lot of different models.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #6 of 20 (permalink) Old 02-16-2018, 09:06 PM
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The chance that the motor unit is bad is about 1%. So, do not replace the entire wiper motor, just the black control box.
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1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #7 of 20 (permalink) Old 02-17-2018, 09:49 AM
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Hey Fred, do you think if it is the circuit board, there is any chance it could be just some cold or loose solder joints? Or is it usually a actual Componet on that board that goes bad? As you know, other circuit boards (twilight sentinel) on these cars for other circuits sometimes has this issue. So I'm wondering if the CB could be helped with a few touches of solder and the iron.

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post #8 of 20 (permalink) Old 02-17-2018, 12:36 PM
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Quote:
Originally Posted by Frontenac View Post
I can not remember if it started working normally as soon as I replaced the fuse. I don't think so. I will have to experiment with it to get a pattern of behavior. It's hard to test if it is not raining. I may have to remove the wiper arms or find a way to replace the wiper blades with little wheels. Do I have to remove the motor to work on this circuit board?
I tried again to post the circuit diagram and I think it worked this time.
I would not do this when its raining or snowing where you live car might get flooded ..
the solid state relay timer is not a schematic available , of the issue you have .. the diagram is typical of GM delco electronics NO circuit board diagram and not gonna get circuit board components..

if you remove power and turnpower back on then wipers park ,then it is most all the time the electronic circuit board ..

Fred may have a used one ... NO new parts...
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post #9 of 20 (permalink) Old 02-17-2018, 07:29 PM
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It is possible that there may be a loose or cold solder joint. I have pulled one of the circuit boards, and it is extremely difficult to remove. If you can find a "black box" it is worth the price to avoid the time intensive labor of fixing the circuit board.

If I get one for you it will be $40 shipped. I will guarantee that it will work, or I will send you another one.
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1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #10 of 20 (permalink) Old 02-18-2018, 08:06 AM Thread Starter
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Quote:
Originally Posted by 4DoorSS View Post
Hey Fred, do you think if it is the circuit board, there is any chance it could be just some cold or loose solder joints? Or is it usually a actual Componet on that board that goes bad? As you know, other circuit boards (twilight sentinel) on these cars for other circuits sometimes has this issue. So I'm wondering if the CB could be helped with a few touches of solder and the iron.
So far, I can't get it to fail in my driveway. Only when I am driving . I removed the cover with the circuit board and inspected it. I could not figure out how to remove that push nut that holds the black plastic disk on, so I could only inspect one side of the CB. Everything looked very good; no sign of corrosion or cracks. Where is the place that might benefit from soldering?
I found a low price locally on the whole WW motor from a 99 Buick LeSabre. It looks the same, but it was mounted upside down and on the driver side. Would it fit and work or would the cover with the circuit board fit and work?
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