I originally installed my Bluetooth kit with the Mic in the Overhead Light compartment. It worked OK, but the quality wasn't great. I tried moving it to the A-pillar... where it was much better.
This guide will cover putting the Mic in the overhead light first, and then fitting in the A-Pillar a bit further down. Most of it is shared no matter where your mic is though! I was going to remove the light assembly bit - but it may be useful for someone retrofitting the OEM VW Phone kit, or the Skoda kit.
A plastic trim tool
A Torx T20 screwdriver
A ruler / coathanger (or something similar)
Some electrical tape.
A couple of Tie Wraps
A little bit of patience!
Some foam or something padded to wrap the Control Module in - to save it rattling.FITTING MIC IN OVERHEAD LIGHT COMPARTMENT
Poke the trim tool in the area circled above. Lever it, and it should POP!
Gently pull that side until its loose, and then repeat at the other side. This piece of trim will come off. Put it somewhere safe!
The circled area above is where the OEM Mic lives. There is a piece of foam in there to block the noise. If you're using the standard Fiscon Mic then you should remove this foam, split the Mic housing open, and put the actual Mic inside this. Follow the Fiscon Instruction Manual for this here: http://fiscon-mobile.com/products/mic.php
Put the trim tool in the area circled above. It will come off like a flap. You may need to prise around the lined area to get this one off.
Leave the flap on, and remove the two torx T20 screws which are circled above.
The overhead light assembly should now be loose, and hang down. Fit your Mic into where you removed the foam from. If you're using the Standard Fiscon Mic, then you'll have a bit of the housing attached to the cable.
You can tuck the rest of your Mic housing into the bit where the red tape is in the above image. It should be fairly well wedged in, but I put a bit of tape over it to prevent it rattling at a later date. If you're not using the standard Fiscon Mic, then ignore this!
Open up your sun visor - the next step is to remove the light under there. Pop your trim tool in the circled area, and the light should pop out fairly easily. Just leave it connected as its not really in the way.
Get a ruler or something similar and tape the Mic's plug onto the end of it. Don't use a lot of tape as its going to be tricky to get it off!
Feed the ruler into the light assembly. It should be pretty easy to feed it to the sunvisor light.
Once you can see the ruler, undo the tape and pull the Mic cable through. If you've gone overboard with the tape, this might be a bit tricky through the tiny hole!
Now we need to remove the overhead handle... or 'Jesus Handles' as they're referred to in my house. Jeeeeezus - as you grab on when going round a corner on two wheels!
Anyway... ping back the 2 flaps and then remove the 2 Torx T20 screws underneath. The handle should then just pull off with a little bit of force.
The purpose for removing the 'Jesus Handle' is to give us a bit more flexibility. If you open the door and pull back the seal, you'll find that you can now pull the roof lining down a little bit beside the handles. This is where we're going to feed the cable to.
Bend a coat hanger to a shape like above. Once again, tie the Mics jack plug onto the end of the coat hanger. Very carefully feed the coat hanger back into the Sun Visor Light - and aim for the area around the 'Jesus Handle'. You'll need to pull the seal back a little on the door / roof and put your fingers in to try and grab it. This bit is tricky and took about 10 minutes until success. Have a little patience!!
Hopefully without too much hassle you'll end up with the Mic Plug poking out above the door. Untape it, and pull the remaining cable through. Gently feed the coat hanger back the way.