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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-13-2011, 09:26 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,212
W124 headlamp switch issue

Earlier today I removed the headlamp knob to clean it and I put it back on. Later on at night I turned it to headlamps on and pulled it out to put the fogs on and it didnt lock to the on position. It just snapped back to off.

whats wrong?

Reply With Quote
  #2  
Old 01-14-2011, 11:23 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,212
hello?
Reply With Quote
  #3  
Old 01-14-2011, 11:28 PM
MBeige's Avatar
Registered User
 
Join Date: Apr 2005
Location: SoCal
Posts: 3,746
Did the fog light just snap back to off (like it was pushed forward), or did the knob rotate to off?

Does the knob hold well on the switch or does it feel loose?
Reply With Quote
  #4  
Old 01-14-2011, 11:48 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,212
yes, it just snaps back forward. It doesnt lock to the on position.

The switch is hard to turn. I cant even turn it to the left or right parking light positions even though when I removed the knob everything was centered.
Reply With Quote
  #5  
Old 01-16-2011, 02:25 AM
MBeige's Avatar
Registered User
 
Join Date: Apr 2005
Location: SoCal
Posts: 3,746
I think this function is in the switch assembly.

You can take the knob off while in position 1 (park lights) and try to pull it with pliers (covered with a thick rag so it won't gouge anything). See if you can observe anything unusual from outside. Otherwise, this sounds like an internal problem to me.

Not that well versed with these mechanisms though, just giving you an idea of what could be wrong.

I forgot - is this cabriolet a Canadian version? Or maybe I'm confusing it with another vehicle. I know in Canada, and the reason I ask, is they're required to have DRL's. So not sure if this affects the switch.
Reply With Quote
  #6  
Old 01-16-2011, 02:27 AM
Registered User
 
Join Date: May 2007
Location: Arizona
Posts: 757
My switch eventually completely broke last year. It was increasingly difficult to rotate for a few months and I could hear the insides making noise when I rotated it. When I finally replaced it, I took the old switch apart and found that the ceramic housing inside the switch had deteriorated and the pieces had become wedged between the rotating parts. If you shake your switch and hear noise inside that sounds like a set of maracas, that's probably what it is. The switch itself is an engineering masterpiece. I was impressed. I think it cost about $50 for a new one.
__________________
1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
Reply With Quote
  #7  
Old 01-16-2011, 09:54 AM
JimFreeh's Avatar
Benz addict
 
Join Date: Mar 2007
Location: Hampton Roads, Virginia
Posts: 3,348
Quote:
Originally Posted by TheDon View Post
yes, it just snaps back forward. It doesnt lock to the on position.

The switch is hard to turn. I cant even turn it to the left or right parking light positions even though when I removed the knob everything was centered.


Bingo!

If everything was fine before you removed the knob, I'll bet you installed it indexed incorrectly.

What you thought was the "off" position was actually the left all night park position... Two click clockwise would not be "headlamps on", instead would be the true "off" position, and the stem would by design return to fog off position.

Jim
__________________
14 E250 BlueTEC black
94 E320 Cabriolet Emerald green
85 300TD 4 spd manual dark blue
Reply With Quote
  #8  
Old 01-16-2011, 10:08 AM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,212
I will try and rotate it without the knob and go from there.
Reply With Quote
  #9  
Old 02-04-2011, 02:23 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Posts: 13,212
well, finally got around to checking this issue out.

Removed knob and bulb and used pliers to move the stalk. It would not turn any further counter clockwise than with the knob on. Then moving it to headlamps on and pulling out, still not locking for the fogs or rear fogs.

Guess I need a new switch.
Reply With Quote
  #10  
Old 02-04-2011, 03:04 PM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
There's a ball bearing on a spring inside that does the detents. The switch is kind of a pain to open up though, I'd want another on hand before taking the one on the car now apart. Good new is they were used on lots of cars so finding a good used spare shouldn't be too bad.

-J

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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 07:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page