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Discussion Starter #1
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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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..
 

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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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Discussion Starter #4
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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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.
 

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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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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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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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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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Discussion Starter #10
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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The black control unit will probably fit, if it looks like the one from the B-body. The wiper motor may have a different crank on the shaft, or the it may be keyed differently, so the motor itself will probably not work.

I have not explored repairing the circuit board, because the module is easy to get, and easy to install.
 

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I had the same exact problem as the OP. I just swapped out the whole circuit box. Fixed it. I'm sure it was the board as Fred states. I got the whole unit for $20 used. Find one in a junkyard or Ebay and be done with it.:smile2:
 

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Agree wiyh Fred, common problem with Chevy, seen it often enough to not even diagnose it further : I suggest replacement (not repair) of wiper control module.
 

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Frontenac - If you do happen to get another Board and find that the original is at fault and assuming you will just replace it, would you be willing to send me the old board?

I'll pay for the shipping but just curious to see if I can fix the issue and plan on doing some Wiper Work in the spring anyway. While I have things apart, I could quickly swap the board and see what happens. If I can fix it, I'll just send it back to you for a spare or keep it if you dont want it. LMK....Thanks.

BTW - If you haven't done so already, it may be worth it to remove the Plug from the Wiper Motor Circuit Board and clean the contacts and see what happens. Maybe you just have a loose connector at the wiring harness.
 

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Discussion Starter #15 (Edited)
Problem solved (I think)

The problem worsened to the point that the wipers would not turn off until I turned off the ignition. Then, when I turned the ignition back on, they parked. I replaced the black plastic cover with the circuit board attached with the one from the 99 LeSabre and they seem to be working normally now. This was an intermittent problem at first, so time will tell if it is really fixed. I did a little research and discovered that this WW motor was used in other GM cars after Caprices and Impala SSs were discontinued. I believe this list shows all the cars that used it: https://www.wholesalegmpartsonline.com/products/Buick/Park-Avenue/MOTOR-Windshield-Wiper-Motor/2876992/19179662.html?partner=googlebase_adwords_parts_oe_make_model&kwd=&origin=pla&gclid=EAIaIQobChMI39TDkPK-2QIVD7jACh23Zg5cEAQYBSABEgLwEvD_BwE . If you want to get a used one at a self-service salvage yard, it looks like the 2002 Eldorado is the holy grail (youngest car on the list). Since you don't know how many miles are on it, look for the least number of years on it. The manufacture date is on a sticker on the motor. These younger cars are big front-wheel-drive cars and the WW motor is stuffed in between the firewall and the strut tower and that makes it difficult to get to the bottom screw that holds the cover on. You need something like a Neiko 03044A tool with a Torx T-20 bit. Don't forget to put some sealant on the top side of the cover to keep water out. The newer cars had the WW motor mounted upside-down so they put the sealant on the other side.
edit: the link to the list didn't quite work; after you click on the link, you need to click on "what this fits" and then "See More" to see the list.
 

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Discussion Starter #17
Thanks!

so you dug out a used WW control board and now its fixed .. good fix on the cheap. you get a back up ?
We got a little rain this morning so I was able to do some more testing in the driveway and it seems to be fixed. Thanks to the advice I got in this forum, I didn't waste a lot of time and money replacing the wrong parts. I did not get an extra circuit board, but it sounds like a good idea since I could not find a new one and the supply of used ones is dwindling.
 

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winter up in the cold north is going away so I plan on getting a couple of control circuit boards and the wiper arms that can lift off the windshield at the scrap yard ..
 

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I had the same problem. Replaced the wiper motor.
You did more work, and spent more money than you needed to. Replacing the wiper motor itself is almost never necessary, and you replaced the controller, so you do not know what was the real problem.
 
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