Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 11-13-2001, 03:55 PM
C Paul
Posts: n/a
Sun roof opens of its own accord during night

Help. My 1997 C180 sun roof opens during the night by about 10mm of its own accord. Also it Sometimes it opens when I press the remote unlock remote control key. I;ve had the motor replaced and the switch with no joy. Any suggestions.
Reply With Quote
Old 11-13-2001, 04:56 PM
dpetryk's Avatar
Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
Find an excorcist.
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
Reply With Quote
Old 11-13-2001, 05:23 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The 1994 & later C-class(US models) use a computer to operate the sunroof & it is powered-up all of the time part number is 202-820-09-26.
The only time this should operate the sunroof is when locking doors(or unlocking) OR if you operate the switch.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
Old 11-13-2001, 05:33 PM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
I think the problem lies with the keyless entry control circuit. The motor will not start without getting electricity and none of the position switches or the dash operating switch are energized when the car is shut off so they cannot do anything to energize the motor.

The car's electrically operated mechanisms may have some kind of position switches that tell the control system that you access with your remote key the status of items like the windows and the roof so when you ask the system to shut the roof and windows when it locks the vehicle it "knows" what to do. I think the tilting sunroof does have some limit switches to sense position, which could either be out of adjustment (telling the system it is not in the proper position when you lock the car) or the system could be influenced by interference. There could be electromagnetic interference from some adjacent source, or, since I believe these things work with an infrared signals as well, you could be getting interference from some other infrared controlled item in your home, like a tv or stereo remote, or possibly a neighbor's stereo remote.

I would not suspect the motor or the dashboard control switch as they need some other help to support clandestine operations. If you are locking the car from a distance with the remote feature on the key maybe the sunroof moves at that time and you do not see it from where you are standing?

You should move the car to another place and see if it continues to happen. Fixing these systems can be costly and frustrating. Good Luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
Reply With Quote
Old 11-13-2001, 11:21 PM
280CEBoy's Avatar
Senior Member
Join Date: Sep 2001
Location: New Hampshire USA
Posts: 206
Stray infrared signals hitting the door recievers?....maybe just enough to whack the sun-roof module? Does it happen every night?
00' C230K
88' 190E 2.3
79' 280CE (Sold)
84' 300SD
73' 450SE
93' 300E
68' VW Bug (what the hell was I thinking!)
Reply With Quote
Old 11-15-2001, 03:38 PM
C Paul
Posts: n/a
Re this sunroof problem. since the replacement of the motor, the roof is only opening up when the car is locked. Is this an indication that the roof is out of sinc.
Reply With Quote
Old 11-15-2001, 07:53 PM
Posts: n/a
my car doesnt even have that bad of an attitude..

that is wild as ever.

by chance did they try to ground it on the back of the sunroof fuse?

good luck

benzat 1982 380 SEC
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sun Roof jim16671836 Tech Help 3 12-17-2004 06:59 PM
w124 sun roof trouble. Freestyler Tech Help 4 06-08-2004 01:36 PM
Sun Roof Over My Head greghskj Tech Help 2 07-12-2002 01:24 AM
Sun Roof Opens when locking car C Paul Tech Help 2 11-16-2001 11:14 AM
Sun Roof and Starmark Warranty Sludge Tech Help 6 08-13-2001 07:14 PM

All times are GMT -4. The time now is 02:47 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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