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Discussion Starter #1 (Edited)
First the list of parts:

Climatronic module - 1718300685
Multisensor - 2118300472
Bracket - 1718300472
Sunsensor -1718300072
Sunsensor Holder - 1718310559

All or some of the above parts will have to bought new. I found Mercedespartsdelivered.com as the cheapest source of new parts.

If all you are going to install is the module and the multisensor, it is a 30 minute job. If you like skinned knuckles and cursing, then you'll want to install the sunsensor.

The very first thing to do is disconnect the battery. Before you do that, unlock the trunk, glove box, and decide whether you want the windows and top up or down.

To install the module, you have to remove the ashtray. The module then just pulls out. Review the following to remove the ashtray:


If your ashtray has a cigarette lighter, you'll have to remove the cover off the front of the lighter to reveal the second screw. Just take a screw driver and pry it off using the left side. Note how the electrical connection fastens into the lighter. The plug goes in at a right angle to the barrel of the lighter. Use a small screw driver at its base to pry it out.

Next mount the multisensor to its bracket. The bracket is fastened to two bolts protruding from the inner fender next to the battery. The connection for sensor is fastened to a nearby cable. Remove the cover and plug it into the sensor.

Installing the sunsensor was a real PITA. I wish I hadn't bothered with it. But if you decide to go ahead:

Remove the radio and the cupholder. Incidentally, everything is held in place by T-20 torque screws. Next comes the speaker grill. The forum has detailed instructions, but essentially tug on each side of it until it pops out. Two metal clips hold it in. Finally, you need to pry out the sunsensor bracket. I used a big long screwdriver. I hooked it under the front edge alternately prying each side until it popped out.

The glove box has to come out next. Remove the metal cover above the door. There are two slots on the bottom of the cover where you slide a small screw drive up to unhook it. Next you take a strong putty knife and shove it into the space between the cover and the dash and pry it down. This required a lot of twisting to force the cover down. I discovered it was glued in!

There are three screws behind the cover, three more for a cover on the bottom, and another four on the lip of the box that holds it to the dash. In addition, I had a 12V outlet that needed to be unplugged. Remember how you unplugged the ashtray.

Now you need to find the sunsensor cable. Look up and into the cavity of the center stack. You'll see two places with masking tape wrapped around the wiring harness. Remove it. You'll need every bit of available space to do this. The cable will be revealed.

The sun sensor just clicks into the new bracket, and its cable just plugs into the bottom of the sensor. Now just stuff it back into its cavity. Unfortunately, I couldn't get it to sit perfectly level. I guess I'll have to live with it.

Now put it all back together. You'll have to synchronize the windows and reprogram the stations in the radio. This little mod worked perfectly, and I patted myself on the back for a job well done. 0:)
 

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Discussion Starter #2
I got the sun sensor bracket to finally sit level. A little tip, with stuff like this keep prying and tugging until it pops correctly into place. BTW, you'll also have to reset the time and date.

I consider this mod a necessity for safety. Trying to adjust the four goofy dials while driving is a PITA plus dangerous. Mercedes should throw in auto climate control as standard considering what they charge for their vehicles.
 

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Registered 2009 SLK350
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I have a feeling there is something else to do to get it working fully.

I think this is the thread https://www.slkworld.com/slk-r171-class-diy/479393-installing-climatronic-module-my-2010-slk.html
So... the bracket and sun sensor arrived today. Decided to put the bracket and gas sensor in, but hit some snags.

(FYI, my car is a 2009 SLK 350, so that's the facelifted version.)

I've taken out the battery, and this is a shot of where I expect the new sensor to go. I guess the bracket should be mounted on those screws marked with the red ovals, right?

DSC_0948.jpg

If I try to position it there, the cable that connects to the sensor is too short - is there some slack somewhere and do I need to pull harder, or cut some cable tie? I've already cut the cable tie that keeps it together with the ground wire there.

Secondly, I don't see any existing humidity sensors. Am I blind, or looking in the wrong place? Note that one of the errors I've been getting when running diagnostics on the car is that that sensor did not respond - which would make sense if it is absent.
 

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DAS/STAR Registered Owner 2005 SLK 55 AMG
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4,022 Posts
Could do with a shot of the wire ..


Here's mine after the install
 

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When i did it, i cut the cable tie and had plenty of slack. I also have never found my humidity sensor, that's still on my list of things to do.
 

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Registered 2005 SLK350
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2,224 Posts
When i did it, i cut the cable tie and had plenty of slack. I also have never found my humidity sensor, that's still on my list of things to do.
Do you know where the humidity sensor is supposed to be located? I seem to remember another member having a similar issue. Post your VIN and I will see what the parts catalog shows specficially for your car.
 

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Registered 2006 SLK280
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596 Posts
Do you know where the humidity sensor is supposed to be located? I seem to remember another member having a similar issue. Post your VIN and I will see what the parts catalog shows specficially for your car.
the humidity sensor is located at the entrance (big opening) of the blower fan. Looks like a white plastic box
 

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Registered 2005 SLK350
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2,224 Posts

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Registered 2009 SLK350
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Could do with a shot of the wire ..


Here's mine after the install
Thanks! It took me a while to realise that your picture was of a RHD car and the connector on the sensor should be pointing towards the back of the car :| but anyways, after turning the bracket around, it now fits a lot better and the cable has enough reach. Didn't bother to get the original Merc nuts (that are listed for about €1 a piece) and went with some self-locking nuts from the local DIY shop (100 for €2,97).

Still haven't found the humidity sensor, I guess it was never there to begin with. My car's VIN ends with 220095, if someone feels the need to look it up in EPC.

Now.. does anyone know how to verify the sensor is functioning without access to DAS/STAR?
Would I have to find a tunnel during a traffic jam, and then wait for the recirculation light to turn on when the outside air is too dirty?
 

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Registered 2005 SLK350
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2,224 Posts
Thanks! It took me a while to realise that your picture was of a RHD car and the connector on the sensor should be pointing towards the back of the car :| but anyways, after turning the bracket around, it now fits a lot better and the cable has enough reach. Didn't bother to get the original Merc nuts (that are listed for about €1 a piece) and went with some self-locking nuts from the local DIY shop (100 for €2,97).

Still haven't found the humidity sensor, I guess it was never there to begin with. My car's VIN ends with 220095, if someone feels the need to look it up in EPC.

Now.. does anyone know how to verify the sensor is functioning without access to DAS/STAR?
Would I have to find a tunnel during a traffic jam, and then wait for the recirculation light to turn on when the outside air is too dirty?
I have never seen the system put into re-circulation due to "pollution" but I live in the country and air quality is pretty good. The system does automatically switch to re-circ when the car has been closed up and it is hot and humid built up inside. Once the interior has been cooled down the sytem will switch the re-circ back off.
 

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Registered 2009 SLK350
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40 Posts
Had some time to kill this morning, so decided to open up the dash to put in the sun sensor. Getting that top vent housing/speaker grille off was a bit scary - had to pull harder than expected, but succeeded. There's a speaker underneath (my car has the HK amp and speakers), but it looked somewhat damaged. Wondering if I messed up while removing the grille, or someone before me:

DSC_0952.jpg

Anyway, popping out the old center window vent was easy, I just pushed it out from below; next up: finding the connector. It was where I was expecting it: attached to the big loom that is in the dash there. Apart from two pieces of masking tape, the sun sensor cable was also held in place by another cable tie - cutting that was a bit scary, as it was tight and in a not so easy to reach location, but my "office hands" did fit in there with a small cutter. Luckily, I did not need to take out the glove box. Plugged it into the sun sensor, pushed that into place and reassembled the rest.

Mission accomplished! Thanks for the pictures and advice :)
 
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