The large rear window sunblind stopped working altogether!?
Thread Starter
Junior Member
Joined: Sep 2024
Posts: 43
Likes: 13
From: Europe
MB S550 2008 4MATIC (V221) M273 412Hp
The large rear window sunblind stopped working altogether!?
Hello,
The rear window blind came down by itself when the car was running stationary and wouldn't go up again after pressing the buttons (which are on the rear door armrests, I don't have any button for this blind in the front).
So from it no results, no noise, nothing but silence. 😕
On Primavera - I don't know which fuse where to look for and if only one is responsible for it or the other 2 side blinds on the rear side windows.
As a second thought, I don't know where the motor is in the trunk and where the blind is retracted/winded up. It might have tripped over something, but there would have been a sound trying to unfurl.
Or the problem could be more serious and probably expensive.
Anyone who has had their sunshade serviced, or has an idea what this issue may be please help. I appreciate any tips, tricks, and ideas on what to try to do myself or take to the Service
The rear window blind came down by itself when the car was running stationary and wouldn't go up again after pressing the buttons (which are on the rear door armrests, I don't have any button for this blind in the front).
So from it no results, no noise, nothing but silence. 😕
On Primavera - I don't know which fuse where to look for and if only one is responsible for it or the other 2 side blinds on the rear side windows.
As a second thought, I don't know where the motor is in the trunk and where the blind is retracted/winded up. It might have tripped over something, but there would have been a sound trying to unfurl.
Or the problem could be more serious and probably expensive.
Anyone who has had their sunshade serviced, or has an idea what this issue may be please help. I appreciate any tips, tricks, and ideas on what to try to do myself or take to the Service
MBWorld Fanatic!
Joined: Aug 2014
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Likes: 1,673
S500
the * button (favourite) on the front comand knob panel, is usually set to do the blind - but can be set to do other stuff - otherwise in the vehicle comand menu is the choice to operate the rear blind
as for the rear - whilst fiddling did someone disable the rear buttons via the drivers door switch panel
as for the rear - whilst fiddling did someone disable the rear buttons via the drivers door switch panel
Member
Joined: Jun 2024
Posts: 191
Likes: 57
E320
If you have a good scanner you can activate it from the scanner to rule out the button issue. I know on my youcanic scanner I can go to Rear SAM control unit then active tests and operate the rear sunscreen. First check the fuses though, then go to the next diagonstic step.
Thread Starter
Junior Member
Joined: Sep 2024
Posts: 43
Likes: 13
From: Europe
MB S550 2008 4MATIC (V221) M273 412Hp
the * button (favourite) on the front comand knob panel, is usually set to do the blind - but can be set to do other stuff - otherwise in the vehicle comand menu is the choice to operate the rear blind
as for the rear - whilst fiddling did someone disable the rear buttons via the drivers door switch panel
as for the rear - whilst fiddling did someone disable the rear buttons via the drivers door switch panel
It goes up and down repeatedly whenever I want.
I've seen the button, but never paid much attention to it, though it sits next to my right hand in front of the armrest.
You are a great person @BOTUS, save me daily headaches!
Be alive and well, such a small thing, I would complicate my routine with fuses, batteries, and even the mechanisms and motors of this blind...
Senior Member
Joined: Aug 2018
Posts: 307
Likes: 61
S350 2008
My rear window sunshade is not working, I using * button and using vehicle command menu to operate the rear blind but not success. I changed rear window sunshade but problem still persist.
Do you know what is the control module of rear windows sunshade? Is this control and powered by rear SAM? I checked and there is no error code related to rear sunshade, any advice to track this problem?
Do you know what is the control module of rear windows sunshade? Is this control and powered by rear SAM? I checked and there is no error code related to rear sunshade, any advice to track this problem?
Super Member
Joined: Oct 2023
Posts: 543
Likes: 191
W221 S500
My rear window sunshade is not working, I using * button and using vehicle command menu to operate the rear blind but not success. I changed rear window sunshade but problem still persist.
Do you know what is the control module of rear windows sunshade? Is this control and powered by rear SAM? I checked and there is no error code related to rear sunshade, any advice to track this problem?
Do you know what is the control module of rear windows sunshade? Is this control and powered by rear SAM? I checked and there is no error code related to rear sunshade, any advice to track this problem?
1. Before changing it did you try the alternative switches?
There's one on each rear door and one in the Vehicle Menu in Comand.
2. The * button only operates the blind if you program it to do so.
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S350 2008
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Super Member
Joined: Oct 2023
Posts: 543
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W221 S500
The rear switch safety cut off is switched OFF isn't it? That will soon stop things from working in the back...
If that doesn't work, then it's likely that both rear doors possibly require a software update.
Removing, stripping down cleaning and reassembling the switches on the rear doors may prove to be a mechanical solution as a stuck switch would confuse the ECUs.
Last edited by AL5461; Mar 19, 2026 at 01:53 PM.
MBWorld Fanatic!
Joined: Aug 2014
Posts: 5,317
Likes: 1,673
S500
it has an anti-trap type setup - once upset you need to hold the switch all the way till up and or down
the configuration of this blind was wrong for 11 years in a poor Rear SAM update - they introduced a bug and never noticed - mine was SCN coded in 2020 and then done correctly in 2022 after Merc woke up as to why they all showed an error in diagnostics that didn't impact its operation
the configuration of this blind was wrong for 11 years in a poor Rear SAM update - they introduced a bug and never noticed - mine was SCN coded in 2020 and then done correctly in 2022 after Merc woke up as to why they all showed an error in diagnostics that didn't impact its operation
Senior Member
Joined: Aug 2018
Posts: 307
Likes: 61
S350 2008
Problem of my rear windows sun blind and rear doors switch malfunction is identified and CGW is a culprit, swap CGW and all is working properly perhaps something wrong on CGW coding is a root cause of the problem and my friend told me that only Vediamo or Monaco able to access the coding menu to correct it.
A bit lazy for CGW replacement bacause a lot of seting need to be implemented, CGW box is contain of CGW, ASSYST, ASSYST PLUS & System Diagnosis. If we change CGW then we need to config all these 4 modules.
A bit lazy for CGW replacement bacause a lot of seting need to be implemented, CGW box is contain of CGW, ASSYST, ASSYST PLUS & System Diagnosis. If we change CGW then we need to config all these 4 modules.
Senior Member
Joined: Aug 2018
Posts: 307
Likes: 61
S350 2008
Update: I successful coding CGW by using Star Diagnostic C4, when you are using StarC4, one additional option "Rear Sun Blind" is show and I just need to enable it. I think the main isssue and the root cuase off the problem is that I was ussing Chinenes Diagnotics such *** Thinktool Master, Launch X431 or ThinkDiag for coding CGW, with these Chinese Diagnostics there is no option realated "rear sun blind" therefore when you make a change of the other option of the CGW and write config to CGW "rear sun blind" option will automatically change from "available' to "unavailable"
