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Command Control Scrolling Knob Replacement
 
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Pelican Technical Article:

Command Control Scrolling Knob Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$200

Talent:

**

Tools:

Trim removal tool, T20 Torx, small flathead screwdriver

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Control knob

Hot Tip:

Careful with the wiring connection

Performance Gain:

Working command center

Complementary Modification:

Detail the interior

The command control scrolling knob is well known to fail over the years in the Mercedes W204. While the part is not cheap, replacing it is not difficult. Make sure you use care when removing the trim sections to replace the knob as the trim can break if you are prying from the wrong place. Also, it can be expensive to replace.

If you are going to be working on the interior of your vehicle make sure you own and use a set of trim removal tools. These hard plastic tools are great for working with trim pieces and pay for themselves many times over the first time you scratch a trim piece by trying to remove it with a screwdriver. Pelican sells them. If you are doing this job and don't own them consider ordering them along with the parts for this job.

You will need to remove the gear shift knob and surround to replace the scrolling knob.
Figure 1

You will need to remove the gear shift knob and surround to replace the scrolling knob. The wiring connection is under the surround, and it is the only way you can access it.

Begin with the shift knob, boot and surround.
Figure 2

Begin with the shift knob, boot and surround. Make sure you are using a trim removal tool. Starting at one corner pry up in the trim piece while working your way around it (red arrows). There are five clips on the piece holding it in place, two on each side and one on the top and bottom. If the piece has never been removed it will be a very snug fit.

With the trim piece free from the console lift it up and press the tabs on the two electrical connections (red arrows), and remove the connections from the piece.
Figure 3

With the trim piece free from the console lift it up and press the tabs on the two electrical connections (red arrows), and remove the connections from the piece.

There is a plastic ring on the base of the shift knob (red arrow).
Figure 4

There is a plastic ring on the base of the shift knob (red arrow). Grasp this with your fingers and turn it counter clockwise. This will release the knob from the shaft.

You can now pull the knob, boot and trim piece straight up and off the shaft (red arrow).
Figure 5

You can now pull the knob, boot and trim piece straight up and off the shaft (red arrow).

Next, remove the surround around the shifter.
Figure 6

Next, remove the surround around the shifter. Start up in the corners (red arrows) and pry up the trim piece. There are two clips on the front of the piece and two hooks on the rear. By prying up the front you can slide the hooks out from the rear by sliding the piece forward.

You can see the clip and how it sits in the plastic mount (red arrow).
Figure 7

You can see the clip and how it sits in the plastic mount (red arrow). While there is a small clip in the center of the trim piece you do not want to pry from the middle or you run the risk of breaking the trim piece.

Open the center arm rest.
Figure 8

Open the center arm rest. Use a T20 Torx to remove the single Torx screw behind the knob (red arrow).

Pry up on the trim piece with your trim removal tool.
Figure 9

Pry up on the trim piece with your trim removal tool. Slide the trim piece forward and off the console (red arrow).

Next, remove the T20 Torx screw in front of the control knob (red arrow).
Figure 10

Next, remove the T20 Torx screw in front of the control knob (red arrow).

The wiring runs up to the left side of the shifter housing.
Figure 11

The wiring runs up to the left side of the shifter housing. Use a pick or small flathead screwdriver. Release the tab and separate the wiring connections (red arrow).

The wiring is mounted to the plastic on the side of the console.
Figure 12

The wiring is mounted to the plastic on the side of the console. Release the tab, and slide the wiring connection down and off the mount (red arrow).

You can now pass the wiring up through the hole in the console, and safely remove the control knob.
Figure 13

You can now pass the wiring up through the hole in the console, and safely remove the control knob. Installation is the reverse of removal.

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