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Old 08-18-2000, 10:56 AM
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
My wipers ('85 300SD) have begun to decide that, after some period of normal operation, they deserve a nap. Selecting LOW speed leaves them still in the "parked" position. Hmm... Momentary selecting HIGH speed produces high-speed wiping. LOW speed wiping and intermittent wiping then resume normal operation. Then, when left on intermittent, the wipers go back to their nap...

(Side note: at highway speeds I don't really use the wipers, as there is a TERRIFIC airflow pattern which just pushes the rain away, leaving relatively clear vision without the annoying sweep! Only when in the draft of another car, which interrupts the airflow, do I need wipers...)

Anyway, back to the main subject.

For further information, the wipers have, once or twice, stopped in their tracks on the glass when I switched to OFF . AHA!

MY deduction, educated guess after studying the wiper schematic is there is a problem in the wiper PARK contact path, which is (somehow) overcome by HIGH speed voltage.

Assuming that a good cleaning of this contact is the solution, is the wiper motor easy to remove, disassemble, clean & reinstall, or is it better to remove and replace?

I had a similar experience with the Suburban, but the wipers would go completely non-functional until a big bump, or rapping on wiper motor, re-started them (for a while.) It turned out that the printed circuit control board, in the motor housing, was defective. I replaced the board, which then cured this problem.

Sorry to be long-winded

BCingU, Jim

'96 E300D 56k mi
'95 Audi 90 118k mi
'92 GMC Suburban 138k mi
'85 300SD 228k mi

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Old 08-24-2000, 01:30 PM
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
Trying to generate an answer.

Would removing and working on the wiper motor be DIY?

This morning they seemed to work fine...

'96 E300D 56k mi
'95 Audi 90 118k mi
'92 GMC Suburban 138k mi
'85 300SD 228k mi
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Old 08-24-2000, 09:28 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I have replaced a handfull of these motors for this problem. One could attempt to fix it onesself, but I would rather have a reliable part installed.

Donnie Drummonds
1991 GMC Syclone

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