Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > SL Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-19-2004, 03:26 PM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
R129 - Window wiper gets stuck

Ok - on to the next new problem....

Anyone experienced stuck wipers? Intermittent used to just get stuck occasionally, then kick start itself again and operate correctly, however now intermittent just fails.

Symptoms are that the blade just stops in the most odd positions across the window, and for each wipe will stop in a different position. Often intermittent just stops altogether.

Also, the blade fails to find the park position - and I think this is my clue. I have to time the use of the wiper switch just right!

There are two 'modules' that control the wiper blade N10/2 (which sits in the black box above the fuse box) and the K26 relay module, located just below the blade somewhere.

My suspicion is that the park sensor in the motor assembly is failing such that the module 'thinks' the blade is parked when in fact it isn't OR that the relay driving the motor (K26) has carbon'ed contacts.

Has anyone else resolved this before?

Cheers
Lea
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg

Last edited by Learoy; 06-20-2004 at 04:44 AM.
Reply With Quote
  #2  
Old 06-19-2004, 05:36 PM
elau's Avatar
Registered User
 
Join Date: Nov 1999
Location: MD.
Posts: 1,725
Love to help, but I don't drive mine in the rain so I don't even know if the wiper works

Put plenty of RainX on the windshield and you don't have to worry about the wiper. I do that to my daily driver, the 300E.
__________________
95 R129
04 Infiniti G35.5 BS
10 X204
Reply With Quote
  #3  
Old 06-20-2004, 11:43 AM
Registered User
 
Join Date: Feb 2001
Location: Northumberland, UK
Posts: 1,294
There are a few threads about servicing and overhauling the wiper system (not specific to the R129) in the Tech Help forum. I think MBenzNL was the main contributor to it. This is a link to his description of the wiper mechanism on his C250 on his website (I can't imagine the fundamentals are any different).

http://members.lycos.nl/mbenz/windshield_wiper.htm
__________________
JJ Rodger
1999 SL 500
1993 320 TE
1986 500 SEC
Reply With Quote
  #4  
Old 06-21-2004, 03:31 AM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
Thanks JJ - I scanned all the forums but couldn't find that much - cheers 'eagle eyes'....


Lea
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg

Last edited by Learoy; 06-22-2004 at 03:26 AM.
Reply With Quote
  #5  
Old 10-16-2004, 06:34 AM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
Managed to get some time last week to strip down the wiper parked sensor (slip rings) attached to the wiper motor. Unfortunately this unit looks typically 'Mercedes clean', however I bent the slip ring contacts such that they press down firmer on the ring, cleaned them and re-greased the whole unit.

Now the wiper has only failed once over a period of four days (in the rain) - but guess that means something still isn't quite right!

The K26 relay module is located adjacent to the ECU box and isn't too difficult to remove. To inspect the relays within, the RTV seal needs breaking - contacts on mine all look excellent!

Thought this may help someone else
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg
Reply With Quote
  #6  
Old 10-17-2004, 09:15 PM
Registered User
 
Join Date: Jul 2000
Posts: 638
flippy wiper system

The sl-600 (94 129) I have has a speed sensitive system when in low or intermitent positions. It stops the wiper when the car is stopped. If your also has this speed sensor, it may be causing the erratic action.
Reply With Quote
  #7  
Old 10-18-2004, 03:26 AM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
Mine is also speed sensitive, but it doesn't stop the intermittent wipe it just reduces the time interval from 5 seconds to 8, under 10mph.

This speed sensitivity is controlled by the K10/2 module (adjacent to the fuse box) and I have no reason to suspect it's failing - however thanks for the tip.

My wipers (at their worst) failed to wipe correctly operate on intermittent (or park) virtually every wipe, so now failing only every four days is much improvement
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg
Reply With Quote
  #8  
Old 11-21-2004, 04:31 PM
Registered User
 
Join Date: Oct 2004
Posts: 13
Sounds like the wiper relay. Mine had exact same symtoms. Replaced the relay, problem solved.
Reply With Quote
  #9  
Old 11-21-2004, 07:13 PM
carson356
Guest
 
Posts: n/a
wiper

i have seen the control relay cause this same problem on a few 129 models
Ray
mercedessd@cox.net
Reply With Quote
  #10  
Old 11-22-2004, 05:01 PM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
Interesting as this is the next item I will investigate. It's a sealed unit, but only by RTV so it's easy to prize open. I've already had a brief look (there are around 7 relays inside!) and so maybe the contacts of one of the relays are sticking or have carboned..

Time for more investigation........
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg
Reply With Quote
  #11  
Old 12-08-2004, 05:34 PM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
Update:

Yes, it's the K26 relay module. Stripped it down to reveal 4 relays. Cleaned all contacts using P800 'wett and dry' and reflowed all components on the pcb.

Haven't had a problem in two days - now bearing in mind that the wipers failed every wipe before the clean this looks promising ;-)

I'll post a few pictures of the module shortly for the benifit of others.

Thanks for the pointers.

Lea
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg
Reply With Quote
  #12  
Old 12-18-2004, 04:46 PM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
Two weeks later and still fine....resolved
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg
Reply With Quote
  #13  
Old 10-16-2005, 06:24 AM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
After the forum HDD crash I'd thought I'd make a repost of the pictures I added last week.

Hope they're useful to someone

The first picture is from a LHD vehicle, the next is my RHD car.
Attached Thumbnails
R129 - Window wiper gets stuck-wiper-relay-k26.jpg   R129 - Window wiper gets stuck-wiper-relay-k26-position.jpg   R129 - Window wiper gets stuck-wiper-relay-k26-2.jpg   R129 - Window wiper gets stuck-wiper-relay-k26-internal.jpg  
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg

Last edited by LeaUK; 12-17-2005 at 10:52 AM.
Reply With Quote
  #14  
Old 10-16-2005, 07:48 AM
Pete Geither's Avatar
Half Fast Moderator
 
Join Date: Feb 2002
Location: Western Pa.
Posts: 2,417
Thanks, and very interesting. Like a lot here, I hardly ever see rain in the SL. but when I have had to run the wipers, they do odd things. Mostly they want to park on the right side in the middle of the intermediate sweep. So that module is under the cowl cover ?
__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K
Reply With Quote
  #15  
Old 10-16-2005, 11:59 AM
Registered User
 
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
If they are indeed parking in weird places I would seriously suspect the K26 - that's exactly the symptoms of mine..

It's under the cover on the drivers side.
__________________
'93 R129 500SL-32
'89 190E 2.6 - sold in 2002

http://antron.pwp.blueyonder.co.uk/i...nature/Sig.jpg

Last edited by LeaUK; 12-17-2005 at 10:53 AM.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 04:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page