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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-06-2009, 07:08 PM
Registered User
 
Join Date: Feb 2007
Location: University Place (Tacoma, WA
Posts: 5
ARGHHH. '94 E320 Dome light issue HELP

Dome light no longer works when ANY door is open. I've tried all the positions with the light switch. Am told the relay could be bad in the dome light assembly. Any ideas there? Does that relay effect any temp controls as well? And yes, I've checked the fuses.
Reply With Quote
  #2  
Old 01-07-2009, 12:57 AM
Registered User
 
Join Date: Jan 2005
Location: St. Louis Missouri
Posts: 473
Hate to ask the obvious, but did you try replacing the bulb? I can't remember exactly, but that overhead assembly clips into place and can be removed by pulling down on the edges. I remember it being fairly snug..... Also, I don't think there is a relay involved with the function of the dome light.

J. M. van Swaay
__________________
1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles
Reply With Quote
  #3  
Old 01-07-2009, 01:09 AM
Registered User
 
Join Date: Nov 2008
Location: Houston, Texas
Posts: 17
If you've checked the fuses, and the bulbs, then my next question is whether your vacuum pump is functioning properly...i.e the connection. The latter was based on my recent experience with dome lights (won't come on when doors opened) and climate control vents that would not open. As soon as replaced the pump, my problem was solved.
Reply With Quote
  #4  
Old 01-08-2009, 06:54 PM
Registered User
 
Join Date: Feb 2007
Location: University Place (Tacoma, WA
Posts: 5
Quote:
Originally Posted by J. M. van Swaay View Post
Hate to ask the obvious, but did you try replacing the bulb? I can't remember exactly, but that overhead assembly clips into place and can be removed by pulling down on the edges. I remember it being fairly snug..... Also, I don't think there is a relay involved with the function of the dome light.

J. M. van Swaay
Bulb is good as I can turn the light on by sliding the switch to the "on" position. There are definitely two relays involved with the dome light. One in the dome light itself and one in the dash.

Last edited by edgeguy; 01-08-2009 at 07:27 PM.
Reply With Quote
  #5  
Old 01-08-2009, 07:30 PM
Registered User
 
Join Date: Feb 2007
Location: University Place (Tacoma, WA
Posts: 5
Quote:
Originally Posted by 98mbe320 View Post
If you've checked the fuses, and the bulbs, then my next question is whether your vacuum pump is functioning properly...i.e the connection. The latter was based on my recent experience with dome lights (won't come on when doors opened) and climate control vents that would not open. As soon as replaced the pump, my problem was solved.
In the dome light, is a sensor for the climate control with a vacuum line running to it. This is not what you mean is it? Which vacuum pump and where was it?
Reply With Quote
  #6  
Old 01-08-2009, 10:49 PM
Registered User
 
Join Date: Jan 2005
Location: St. Louis Missouri
Posts: 473
Curiosity got the better of me--took a look at the wiring schematic.

Dome light assembly is E15/4, contains 5 elements, dome light, reading light, and 3 seat belt warn bulbs. Also contains the switch and an electronic control circuit. (control circuit is denoted by a transistor symbol...) No relay is shown. Power feed for all light elements is fuse number 9, power feed for control circuit is fuse number 5. Ground is supplied from connection point W4. If there are relays involved in the function of the dome or reading lamp they are not shown on the schematic......

Send me a pm with your email address, I'll send you a PDF of the schematic.

J. M. van Swaay
__________________
1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles
Reply With Quote
  #7  
Old 01-09-2009, 10:37 AM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
IIRC the dome light and seat-belt warning light are controlled by a relay/control box behind the instrument cluster, usually fails on though.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #8  
Old 01-09-2009, 11:22 AM
Registered User
 
Join Date: Jan 2005
Location: St. Louis Missouri
Posts: 473
Yes, I think I see the module you are referring to. N2/4 is located behind the cluster and is identified as "seat belt warning module". From the schematic, there is a single input from the seat belt warning module to the control module located in the overhead lamp assembly. It seems logical that N2/4 would only affect the seat belt warning lights.......

Does the "seat belt warning module" also have an effect on the dome light??????

Maybe there's more to this than I thought!

J. M. van Swaay
__________________
1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles
Reply With Quote
  #9  
Old 01-09-2009, 11:26 AM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
I believe that it is responsible for the delay. Several times I've read of 124 dome lights staying on and the belt-warning light continuing to flash, and the warning module is resposible. It would follow that this could also be responsible for the lights not functioning, I'm making the assumption that the seat-belt warning light is not flashing also (OP?).
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #10  
Old 01-09-2009, 02:20 PM
Registered User
 
Join Date: Sep 2002
Location: Allentown, PA
Posts: 482
Vacuum & Interior lights

Quote:
Originally Posted by 98mbe320 View Post
...based on my recent experience with dome lights (won't come on when doors opened) and climate control vents that would not open. As soon as replaced the pump, my problem was solved.
Obviously, the vac operates the vents, but was this a coincidence or is the door lock vac system really connected to the interior lighting system? Is this interconnect common to most MBs or only specific models / years? If these systems are connected, how so? Or am I missing something?
Reply With Quote
  #11  
Old 01-09-2009, 06:08 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
There is no connection, vacuum or electrical, between the vents, dome lights, and lock-pump in the '94 E 320.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #12  
Old 01-15-2009, 01:30 PM
Registered User
 
Join Date: Feb 2007
Location: University Place (Tacoma, WA
Posts: 5
I'm still kinda "stuck" here. If I can turn on and off the lights with the switch, the buzzer does come on...do I head for the relay behind the dash first or the dome light assembly?
Reply With Quote
  #13  
Old 01-15-2009, 11:08 PM
Registered User
 
Join Date: Jan 2005
Location: St. Louis Missouri
Posts: 473
Bulb is good as I can turn the light on by sliding the switch to the "on" position

Is it the dome light bulb that comes on, or is it the reading light bulb that comes on. (or do they both come on?)

Again, forgive me if I'm asking the obvious here, but there are two bulbs and your post refers to a single bulb...................

J. M. van Swaay
__________________
1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles
Reply With Quote
  #14  
Old 01-16-2009, 10:47 AM
Registered User
 
Join Date: Dec 2002
Location: New Castle County, DE
Posts: 961
And when this is resolved, can we also look into what is causing my 87 300E dome light (the lamp that comes on when the doors are opened) to flash on and off when door is open or in delayed off mode? Already swapped another complete unit, does the same thing. Am I looking to replace the seatbelt relay? Thanks.
__________________
Hanno
'79 6.9 Sold (after 27 years of ownership)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'95 E320 TE Wagon
'95 E320 Sdn.(on loan to mom!)
'95 E320 Sdn. 275k, winter car
'87 300E (5 spd. conversion) Sold
'79 280E, parting out
'94 E320, parting out
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 07:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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