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2012 SLK 350 smartTOP Installation Addendum

This is an addendum to the installation guide for the smartTOP STHFMZ2 Control Module which can be found at: http://www.mods4cars.com/sms/db/smarttop/ext/support/manuals/mercedes/STHFMZ2/install/en.php.

IMPORTANT!!
here's link to the post about removing the rear speakers first: http://www.slkworld.com/slk-r172-general-discussion/22701-installing-r172-version-smarttop-module-4.html#post288005

No need to disconnect the speakers!See post #189 for more info

GENERAL COMMENTS:
The smartTOP guide is quite good but there are some gray areas that I hope to clarify with this narrative.
The steps listed below refer to the steps in the original installation guide and any steps that are skipped are where the original guide works just fine as is.

The first thing to do is hook the module up to a computer and check for updates, when I did my installation there was an update for the module from a just couple of days earlier to version 1.11.

For any photos in the guide that showed any wiring, I printed out as full page photographs, these turned out to be quite handy.
Note that the actual space where the roof control module lives is pretty small and there is not much room to work in.

The roof control wiring connector that you have to swap wires on is quite small, which the photos in the guide don’t indicate. Make sure you have plenty of light where you do the installation so you can clearly see the connectors, slot/pin numbers, and wire colors.

The Torx screws holding the metal plate to the bulkhead are fairly large and a 3/8” ratchet socket wrench is recommended. I used a 1/4” ratchet wrench which worked but the larger size wrench would have been better.
 

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MY ADDITIONS TO THE GUIDE:

Guide Steps 1 – 2:

When removing the various Air Guide parts keep the right and left sides separate as most of the pieces are not interchangeable. Some of the parts are stamped with an ‘R’ or ‘L’ if you do mix them up. There is a rubber O ring on each of the mounting bases that are easy to lose.
 

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Guide Step 5:

When removing the center pocket on the rear bulk-head, first pull the top elastic part to the right to free that side’s clip from the slot underneath it and then pull the pocket towards the front of the car. That will release the clip from the slot completely. Then do the same for the left side.

Then push the whole pocket up from the bottom to free the four bottom clips from their slots, then pull the pocket towards the front of the car to release the clips completely from the remaining slots. Don’t force any of this - the clips on the back-side of the pocket are plastic and easily broken.
 

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Discussion Starter #4 (Edited by Moderator)
Guide Steps 5 – 7:

IMPORTANT!!
here's link to the post about removing the rear speakers first: http://www.slkworld.com/slk-r172-general-discussion/22701-installing-r172-version-smarttop-module-4.html#post288005

No need to disconnect the speakers!See post #189 for more info

The next step is removing the cover that surrounds the roll-bars. If you have the Logic 7 sound system (and maybe stock) there is a speaker under the right side of the cover and another speaker under the left side of the cover. The wires running from the wiring harness to the speakers are quite short with little slack. Therefore, do not raise the roll-bar cover more than 2 – 3 inches. You have to remove the wire connectors from each of the side speakers before you can move the cover out of the way.

There is very little room to get your hand in a good position to release the connector from the speaker (I have big hands so it may be easier for other folks). For me, the speaker connectors would not budge and I broke one of them in the process. Only pull the connectors straight out from the speaker socket. If you try to wiggle them out by moving them left or right you’ll break it as I did. Take your time here as replacing the speaker connectors is a real pain in the ***.

What’s weird is the center speaker has the same connector and it released right away but it also is out in the open where you can get a good grip on it. Also the center speaker wires have plenty of slack - go figure!

If you do break a connector, the part number for the socket (plastic cap small) is 0305452828 and the part number for the crimp contact (female) is 0085455526. Both the crimp and the socket are quite small and delicate and difficult to install without the proper tools.
 

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Guide Steps 5 – 7 Continued:

Looking at the photo below of the underside of the roll bar cover on the driver’s side below, I now realize that you may be able to remove each of the side speaker housings from the roll bar cover before the roll bar cover is lifted at all.
That would make disconnecting the speaker connectors much easier and must be how they do it at the factory in the first place. Something for someone else to try!
 

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Here are the socket and crimp connectors and their part numbers:
 

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Guide Step 9:

The guide says to loosen all of the ten Torx screws on the bottom of the metal plate, I actually removed the five on the passenger side to give me more room to work with.

Guide Steps 10 – 11:

I wedged the shipping box that the module came in into the space between the bulk-head and the metal plate to maximize the work space.
 

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Guide Step 12:

Pay attention to the slot numbers on the connector before tapping the wires to be sure that you have the correct ones.
 

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Guide Steps 13 – 15:

When the Guide refers to “pushing in the locking tab”, that tab is underneath the white ‘lever’ not to the side as the photo implies. Pushing up the bottom of the white lever while also pushing the lever to the right will free it.
 

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Guide Steps 16 – 19:

For all of these steps double check that you are working with the correct slot numbers on the connector and the correct wire colors before releasing the wire contacts from the connector.
Then double check that you have the correct wire color for the correct slot number before you push the wire contacts from the smartTOP wiring harness into the connector.
Finally make sure the wire colors match what the Guide says before making the connections in step 19.
 

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Guide Step 20:

After all the connections have been made and you have pressed the unlock button on the key fob once, make sure that the Green LED is blinking as stated in the Guide. This is the only chance you have to be sure the module is actually functional before you put everything back together.
You cannot do any other testing of the roof operation until everything is reassembled.
 

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When putting everything back together, the two carpet brackets are not interchangeable, but they are marked on the back which goes on the right side and which goes on the left side.
 

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One final note, when I had my module hooked up to my computer, I programmed all the settings I wanted. However, once the module was installed in the car, all the settings reverted back to the defaults. No big deal but something to be aware of.

I found the control matrix chart at the end of the smartTOP Operation and Programming Guide very useful when programming the module in the car and keep a copy of the matrix in the car.
 

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Thank you for the write-up and tips.
 

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shall we move it to diy or leave it here in r172? Master Po (Woolly)?
 

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Thank you this is awesome! I'm gonna have my mechanic install the smarttop for me sometime this week when it comes in. I've already received the "add a circuit" from slkstore, but the smarttop was shipped direct from the manufacturer and I havnt recieved it yet. Thanks for this writeup its awesome!
 

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pteam, you can also click the 'thanks' button on the bottom right of anyone's post you wish to thank
 

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Omg Rabbit did you put any miles on the new car before you took it apart? And since it is a brand new R172 and lets just say something goes wrong how will it affect you warranty since you opened up the new Slk before the Mb Mechanic had a chance to learn on your new R 172?
 

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:tu:WhiteRabbit, EXCELLENT DIY tutorial. First R172 on this forum, first R172 SmartTop install. Thanks for all your first hand information and contributions.
 

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Omg Rabbit did you put any miles on the new car before you took it apart? And since it is a brand new R172 and lets just say something goes wrong how will it affect you warranty since you opened up the new Slk before the Mb Mechanic had a chance to learn on your new R 172?
I had the car for two weeks and about 250 miles before I took it apart. Since I had prior experience with smartTOP for the SLK I was fairly confident that it would work out OK.
 
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