windshield wiper on 93 Suburban

[Donald]

The windshield wiper on my Suburban does not always work. It may work for 30 minutes then stop. If I open the hood and give a knuckle rap on the switch box (this is the box that determines where across the windshield the wiper is in order to park it) it will start to work again. I opened the switch box and cleaned the moving contact a little with a wire brush and that seemed to help for awhile, but now its back to its old tricks. Maybe clean it again with some emery cloth instead?

 

[Donald]

I also see a wiper motor circuit board on EBAY for sale and they mention solder joints that break, so I wonder if thats my problem. I do not think that the wiper motor circuit board is part of the switch box with the moving contact. But if they are close on the firewall, a knuckle wrap to one could effect either.

 

[eljefino]

Does it also not work on super high speed? My GM stuff bypasses the "brain" when switched on high. This would indict the motor itself or a bad ground etc.

 

[Donald]

When it fails it does not work on any speed or setting.

 

[kc8adu]

99% chance of bad solder joints.
take the cover off and resolder the joints at the plug.
better yet resolder every joint.there arent many.

 

[cousincletus]

Or you can just get a new wiper module. That is your problem. Make sure yours wasn't one of the recalled ones before you buy a new one. Oh, the joys of ACDelco (Valeo in this case) sourcing their parts mfg. in Mexico!

Available at www.gmpartsdirect.com. I got one for my previous truck (1996 S-10) for 35 bucks including shipping.

 

[Vaca]

I had the same problem a few years back on a '93 Suburban also. I replace the control board that's on the wiper motor (around 30 or so bucks from the dealer if I recall) and the wipers were perfect. Also, they didn't always park properly either, and that problem was also fixed with the new control board.

 

[05RSTD]

Quote:

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99% chance of bad solder joints.
take the cover off and resolder the joints at the plug.
better yet resolder every joint.there arent many.

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I did mine.... worked the balls. There is however a NTSB safety recall, (a small matter of not being able to see all of a sudden) search here: http://www.ntsb.gov/ I had done mine by the time it was issued.