W124 sunroof maintenance

The Crooner

Active Senior Members
Joined
Sep 24, 2008
Messages
665
Reaction score
62
Location
Woodhall Spa Lincolnshire
Your Mercedes
2006 R320 cdi
Hi

My sunroof is sometimes sticky when going into the tilt position. Is there a "howto maintain your sunroof" anywhere?

Also, how are you supposed to close it, or is mine faulty? I have to juggle precisely the point at which its fully closed using the movement of the switch one way then the other.

Tony
 

wireman

Senior Member
Joined
Sep 20, 2005
Messages
2,632
Reaction score
3
Location
lancashire
Your Mercedes
nice 201 2.5D 1993 & very nice 129 SL500 1994
Your sun roof switches FIVE operating positions:-
At rest,
Sliding the sun roof switch backwards opens the slide,
Sliding it forwards closes the slide, motor is cut off by limit switch.
Pushing it up opens the tilt.
And pulling it down closes the tilt, motor is cut off by limit switch.
also
Pushing it up with roof slide open, closes slide then opens tilt,
And pulling it back with tilt open, closes tilt then opens slide.

The operating switch sets the motor running in one or t'other direction to open slide/close tilt or close slide/open tilt, its wires go to a second switch mounted on the motor in the boot, this switch is driven by the sun roof winding spindle and should cut off the motor when it hits the closed position from either tilt close (pull switch down) or slide close (push switch forwards).
I suspect that it has been incorrectly adjusted or that the switch itself is defective.

To adjust the boot mounted motor switch there is a small knob on its spindle (near the hexagonal emergency control shaft) this can be pulled out (gently) and the switch rotated to set the position at which the cut off occurs, push it back in after adjusting it.

Your roof should stop at some point in its travel (same place from either direction) due to this switch, the adjustment of the switch spindle will determine where it stops. Find out where it stops and shift the motor switch setting a little then see where it stops and then using the amount you moved the switch as a guide make further adjustments to move the cut off position to the proper closed position. It may need to be a full turn or two of adjustment to get it right.

There is no motor cut off or limit switch at the extremes of roof travel i.e. full tilt or slide, the limit switch only controls the closed position of the roof.

I dont know of a how too on maintainance but my owners book says something like this:-
Clean the sliding parts of grime and lubricate the moving parts with light oil whilst the sun roof is open. Examine the seal on the edge of the roof for damage or big hard bits of filth stuck into its sealing face.

Beware of taking too many bits off the sun roof, it can be a long nightmare putting it back together.
 
OP
The Crooner

The Crooner

Active Senior Members
Joined
Sep 24, 2008
Messages
665
Reaction score
62
Location
Woodhall Spa Lincolnshire
Your Mercedes
2006 R320 cdi
  • Thread Starter
  • Thread starter
  • #3
Thanks

Will go and investigate some more and clean and lubricate. I do have some non-sticky grease.

Tony
 
OP
The Crooner

The Crooner

Active Senior Members
Joined
Sep 24, 2008
Messages
665
Reaction score
62
Location
Woodhall Spa Lincolnshire
Your Mercedes
2006 R320 cdi
  • Thread Starter
  • Thread starter
  • #4
Hi

Its as I thought - the switch does not cause the roof to reverse in either the slide or tilt mode.

Will the switch be at fault or the relay? Is the switch replaceable and where is the relay?

TIA

Tony
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
I felt that bump:D:D

I would spray all of the tracks with PTFE, and the same with the switch that operates it as a starting point, if the roof is just tight you may have to juggle the switch, and that could be OK. you do have a handle to operate it in the tool kit
 

roadhog

Senior Member
Joined
Aug 2, 2007
Messages
1,616
Reaction score
2
Location
Sunny Norfolk
Your Mercedes
W124 300D x2, C124 300
I don't have a handle in mine and my switch only does the tilt and slide bit, sometimes only when it feels like it. The other three functions as described above are sadly absent. How do I get switch out and can it be repaired/cleaned etc?
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Most switches on a 124 are the rocker type, and you could get an aerosol spray of switch cleaner and spray it in down the sides on the rocker button while operating it, there would be nothing gained in taking it out to be cleaned. it will not harm any wooden panels, and just wipes off
 
OP
The Crooner

The Crooner

Active Senior Members
Joined
Sep 24, 2008
Messages
665
Reaction score
62
Location
Woodhall Spa Lincolnshire
Your Mercedes
2006 R320 cdi
  • Thread Starter
  • Thread starter
  • #9
Thanks Malcolm, I will go spray the switch later.

I have a distinct premonition of an immediate return thereafter, desperately seeking relays.

Tony
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
The motor for the roof, could contain a thermal cut out, and this would explain the juggling that is is required to close it if the tracks are too tight, there could well be nothing wrong with the switch
 

124coupe

Senior Member
Joined
May 7, 2006
Messages
532
Reaction score
2
Merc sell a little pack of sunroof rail lube - looks like Vaseline - I was given a lump on the back of a business card while waiting for some spares to be fetched from "out the back". :lol:
 
OP
The Crooner

The Crooner

Active Senior Members
Joined
Sep 24, 2008
Messages
665
Reaction score
62
Location
Woodhall Spa Lincolnshire
Your Mercedes
2006 R320 cdi
  • Thread Starter
  • Thread starter
  • #12
OK

The roof move strongly in the open direction only, so to close it I have to go from tilt to slide and vice versa. The switch does not operate in the reverse direction in either tilt or slide mode, this after a liberal application of contact cleaner.

I have greased my rail with some vaseline type stuff I bought ages ago for the purpose - non sticky white grease if my memory serves me right.

The motor is healthy - there is plenty of torque to open the roof and it goes from tilt to slide and vice versa reasonably quickly, especially now the rails are greased.

Its not really a big issue, but its hard to judge when its correctly closed, and I cant stand things which dont work as intended.

So what can cause the motor/drive chain/control system not to reverse as intended?
TIA

Tony
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
As I said earlier there is a thermal time switch that closes again in 2 sec and this would explain the erratic nature of the switch.

I can send you one fault that stops it closing and the wiring diagram
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
As your Email is shown I have posted them to you
 
OP
The Crooner

The Crooner

Active Senior Members
Joined
Sep 24, 2008
Messages
665
Reaction score
62
Location
Woodhall Spa Lincolnshire
Your Mercedes
2006 R320 cdi
  • Thread Starter
  • Thread starter
  • #15
Thanks Malcolm.

There is no reason to believe that the roof is travwelling on worn bearers, it runs smoothly, and does not catch anywhere on its travels.

I will investigate the switches on the motor tomorrow. I presume the relay is under the passenger rear seat with all the other comfort relays?

Cheers

Tony
 
Last edited:

swannymere

Senior Member
Joined
Jun 10, 2009
Messages
108
Reaction score
0
Location
Hampshire
Your Mercedes
S124 1994 E300D
The sunroof on my 95 300D only tilt's, it won't slide at all, any suggestions?
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Hello and welcome. Can you wind it back with the handle
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Hi, It's electric, do you mean manually from the boot?

Yes there should be a little handle in the tool kit, the motor sits at the top of the wheel arch in the boot left hand side.

If you can open the roof manually,,you can then grease the tracks, with some thing like WD40 to start with, then follow up with something like PTFE
 


A truly one stop site for Mercedes owners. Very experienced – friendly – down to earth – cost effective repairs offering either genuine or same quality parts so that you do not compromise your Mercedes heritage or reliability. Tel: 01406 422457fleetroadgarage.co.uk
Top Bottom