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  #1  
Old 06-04-2018, 04:59 PM
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Location: Near Williamsburg, Virginia
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R129 windows

How can I modify a US spec R129 so the windows may be opened by using nothing more than the two window switches?

Years ago I removed the US spec window relays (located behind the instrument cluster) in the collection of W123s (300 Ds / 280 E) that our family and friends drive. We can open and close the windows at will without turning on the glow plugs, searching for a key or a remote we all know the drill.

Thanks,

Robby

1992 500 SL
1995 SL 500
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  #2  
Old 06-04-2018, 05:32 PM
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The R129 is more complicated than down / up.

Later cars ( At least from 97 + ) drop the windows a bit when you pull on the handle. This is because the glass under the upper weather strip for better sealing. Early cars ( 90 to ? ) might not drop the glass because it rests against the weather strip.

The windows are tied into the top controller so they lower when the top is being moved.

Later cars can raise / lower the windows by pressing and holding the remote lock button or inserting the key in the door , turning to lock or unlock and holding it until the windoes complete a cycle.

You need a wiring diagram for the year / version you are working on as there are several versions. You might be able to send a signal to the window controller to make things move.
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  #3  
Old 06-04-2018, 08:21 PM
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"The R129 is more complicated than down / up."


Exactly, and that's my problem. All I want is a window switch that is always hot & and doesn't have to be energized via the key switch. The wiring diagram for this car covers 1,200 pages and I've previously used it ... printing and taping pages together. Just the diagrams for the interior and exterior lighting will spread out over my dining table. Okay, it didn't cover the entire table, just two place settings. Ha. If someone has been there, done this and can save me some time, I would be most appreciative.

The older cars used those ubiquitous electrical/mechanical relays, whereas the 124 & 129 used printed circuit boards. The last electrical issue I had with the R129 I eventually traced to two pins in a control module, fixed it, and when I brought the subject up with a neighbor, he was totally familiar with the module I repaired.
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  #4  
Old 06-04-2018, 11:44 PM
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Join Date: Dec 2010
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Hey Robbie,
how is Pea Soup doing?
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  #5  
Old 06-06-2018, 10:00 AM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
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Pea Soup is doing quite well, in spite of the oak tree that she took a direct hit from. She looks just like before, that is, after Bob Platz and his team spent 18 months bringing her back to life, ha.

Mum, from NS will be visiting here in two weeks, and it's our custom to take a drive up the James River in two top down SLs to a nice luncheon spot. She and I will enjoy the 190 SL, and Susan and mother's recreational aid will join us with the old white 500 SL.

It is so good to hear from you, and we must make it to your home on one of our Maritime trips. I hope you and your MBs are doing well!

Robby
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  #6  
Old 06-06-2018, 10:07 AM
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Location: Near Williamsburg, Virginia
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Back to the subject at hand, If I remember correctly the windows are controlled via the N52 module, but a number of MB parts suppliers have conventional relays listed for R129 windows. If there are relays, I have no idea where in the circuit they are located. Further I have the thought that the ignition lockout for window operation is not found in European models -- that it is a US DOT spec.
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  #7  
Old 06-06-2018, 10:12 AM
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Quote:
Originally Posted by Robby Ackerman View Post
Pea Soup is doing quite well, in spite of the oak tree that she took a direct hit from. She looks just like before, that is, after Bob Platz and his team spent 18 months bringing her back to life, ha.

Mum, from NS will be visiting here in two weeks, and it's our custom to take a drive up the James River in two top down SLs to a nice luncheon spot. She and I will enjoy the 190 SL, and Susan and mother's recreational aid will join us with the old white 500 SL.

It is so good to hear from you, and we must make it to your home on one of our Maritime trips. I hope you and your MBs are doing well!

Robby

I'm a bit of a ways from the Maritime. More like Detroit area.
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  #8  
Old 06-08-2018, 03:48 PM
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Dan -- I always look for an excuse to add some miles to my trips. You are what, about 100 km east of Detroit?
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  #9  
Old 06-08-2018, 05:03 PM
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Quote:
Originally Posted by Robby Ackerman View Post
Dan -- I always look for an excuse to add some miles to my trips. You are what, about 100 km east of Detroit?
I'm about that distance. Right at the Ontario Michigan border on the St. Clair River.
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