SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Drivers window won't work. Changed motor / controller

Old Apr 3, 2017 | 06:25 PM
  #1  
Brian McL's Avatar
Thread Starter
Super Member
20 Year Member
Photogenic
Photoriffic
 
Joined: Sep 2002
Posts: 619
Likes: 5
Drivers window won't work. Changed motor / controller

I'm out of option with this roof/window but I will review the details in the hope someone knows what to do next.
1) the car was backed into a pole hard enough to deploy the roll bar and the RB light was on and of course the roof stopped working. Didn't give it much thought since the car had the hard top on and I was happy to leave it on. So I just lowered the RB and drove the car for several months. No problems. The windows would open slightly and close each time we opened the door, as required by the roof controller.
2) now the drivers window stopped working completely. Didn't open slightly when the door was opened and wouldn't work at all with the console button.
3) had the car scanned and the codes indicated the hall effect sensor (motor) and a micro switch. Which is a mystery because since this car is a 97 and there isn't a micro switch in the door for the window. They tested the motor but there was no power to the motor. Putting 12V onto the motor itself made it work....so it's not the motor, but maybe the hall effect sensor..or maybe the controller.
4) sent the controller to BBA and had the roll bar code cleared and the unit was returned checked and "repaired". Benched tested, I assume by them, and worked as normal....repaired! Put it back in the car...no difference with the windows BUT the RB lights are now out. I haven't tried to work the roof cause I know if the window won't go down it won't work and I don't want to through another code in the controller.
5) So it maybe the hall effect sensor which requires a new motor! Replaced the window motor, thinking the hall effect sensor was the problem...nope...still the window doesn't work.
The only thing left to check is the micro switch....but the door is not suppose to have one.
Now what?....anybody got a direction I can start looking?....any ideas?
Reply
Old Apr 4, 2017 | 12:34 PM
  #2  
Brian McL's Avatar
Thread Starter
Super Member
20 Year Member
Photogenic
Photoriffic
 
Joined: Sep 2002
Posts: 619
Likes: 5
Originally Posted by Plutoe
Post your VIN!
WDBFA67FXVF150656
Reply
Old Apr 4, 2017 | 06:45 PM
  #3  
Brian McL's Avatar
Thread Starter
Super Member
20 Year Member
Photogenic
Photoriffic
 
Joined: Sep 2002
Posts: 619
Likes: 5
Originally Posted by Plutoe
Maybe the attached will help
Thanks Plutoe but the 97 doesn't have that limit switch. That was stopped in 95.

The micro switches in the door tested Ok and the DS window still won't work.
So...had BBA "rebuild" the controller, replaced the window motor because the code said "hall effect sensor"
checked the console switches and door lock micro switches because code said "DS window micro switch", checked the wiring harness where it enters the door for broken wires, nothing..and still no window.
What's left...? I'm outta ideas....what a PITA.
I'll get it scanned again
Reply
Old Apr 4, 2017 | 07:41 PM
  #4  
Lee Wireless's Avatar
Member
 
Joined: Jul 2008
Posts: 213
Likes: 31
From: SW Florida
1995 SL500 - 2017 AMG GLC 43
Originally Posted by Brian McL
Thanks Plutoe but the 97 doesn't have that limit switch. That was stopped in 95.

The micro switches in the door tested Ok and the DS window still won't work.
So...had BBA "rebuild" the controller, replaced the window motor because the code said "hall effect sensor"
checked the console switches and door lock micro switches because code said "DS window micro switch", checked the wiring harness where it enters the door for broken wires, nothing..and still no window.
What's left...? I'm outta ideas....what a PITA.
I'll get it scanned again
Brian-did you check the position of the micro-switch? There is an adjustment on the switch. It allows you to adjust when the switch activates. Mine is set in the middle of the adjustment range. I assume you have disconnected the battery to let everything "normalize." If not, I'd do that too. Did you ever spray the components as I recommended?
Reply
Old Apr 4, 2017 | 11:24 PM
  #5  
Brian McL's Avatar
Thread Starter
Super Member
20 Year Member
Photogenic
Photoriffic
 
Joined: Sep 2002
Posts: 619
Likes: 5
Yes Lee...I confirmed that the switch was activated when the door was "latched". The position of the micro switch was in the middle. The switch itself tested fine. But I'm missing something,...I'll "normalize" as you suggested but pass. side functions as it should.
Reply
Old Apr 5, 2017 | 06:44 PM
  #6  
Brian McL's Avatar
Thread Starter
Super Member
20 Year Member
Photogenic
Photoriffic
 
Joined: Sep 2002
Posts: 619
Likes: 5
I'm pretty sure it's the controller and that BBA messed up the repair or didn't complete it correctly...should have done my due diligence BEFORE I sent it to them.
Thanks all for your help.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 12:23 AM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE