simonkim212

Hi folks.

I wanted to see if any of you other guys have encountered an unresponsive COMAND Control Knob that allows you to scroll through your menus.

The knob works when you single tap it in the direction you desire however it is unresponsive when you try to rotate the knob to scroll through selections.

The car is over 8 years old so I figure fatigue has caused it to fail.
Have any of you guys successfully fixed this knob?

Thanks.

B737

frequent failure. search is your friend. have a look here:
https://mbworld.org/forums/glk-class...l-failure.html

dennish

Common failure. Happened to me. Much info on the fix. Search

simonkim212

I actually tried to remedy this problem over the weekend and it was unsuccessful. I purchased the $30 metal shaft on Amazon and reviewed the step-by-step instructions on the shaft replacement. It looked fairly elementary on paper but it turned out to be a 2+ hour affair in real life. The circuit board was exposed, a lot of wires were tugged too hard, and the clips didn't come on/off as easily as it was described on the instructions. Long story short, you're probably better off buying a new $300 COMAND control module than go through the entire disassembly/assembly process. DIY lesson learned.

dennish

I found a new genuine one on ebay for $100

shotgun_banjo

It cannot be that hard. I did this 3x already on 3 different W204 and the problem is how to unclip the wire below the center panel. You just need to really reach in from below (side of driver seat) with your finger and pull it sideways towards the driver's door. If you have a skinny finger it will help a lot. If you buy a new command knob you are paying 300x more than just a simple fix. I only used gorilla glue and glued on the broken part and when that was dry I applied a second layer of gorilla glue along the edges which I let it build-up then let it dry. It has not failed on me yet after 2 years and same on the 2 other W204s I fixed.

If we can do it so can you just don't lose patience.

xEryx

Mine failed around 3k miles before my ELW expired and it is getting replaced under warranty at 75k

psaldanha

Its a simple and easy fix! There is also a diy video on youtube! Easy search!

What i did was glue (a superstrong glue - some kind of epoxy) the broken shafts. Then i even reenforced the sides with some plastic shaft glued!

Till today brand as new!!

5 € i spend!

Just follow the diy video!!https://www.youtube.com/results?sear...b+fix+man+cave

Good luck!