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  #1  
Old 08-18-2000, 11:56 AM
Geezer
 
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

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'96 E300D 56k mi
'95 Audi 90 118k mi
'92 GMC Suburban 138k mi
'85 300SD 228k mi
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  #2  
Old 08-24-2000, 02:30 PM
Geezer
 
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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  #3  
Old 08-24-2000, 10:28 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.

------------------
Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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