I purchased an noise canceling mic to help with convertible noise. I mounted on the steering wheel column and ran the wires between the leather surround (that attached to the CIM and moves when you adjust the steering column) and the dash. This was very easy to do.
Thank you for the update. I'm doing some research and would love to do this. What head unit did you go with?First off, thanks iamamused for starting this thread. I wanted to give back by adding what I did and the parts I used to keep the info updated with parts availability, especially for those wanting to purchase in the USA. I wasn't able to find any InCarTec items locally so I looked at other manufacturers. One departure from iamamused's method was I hooked audio from the head unit's pre-amps to the factory amps rather from the head unit's amp'd outputs and then requiring a converter/step-down. It ended up being cheaper and, IMO having better audio quality.
Car Harness Adaptor:
Spiral Audio WH-0020
Steering Wheel Control Adaptor:
Metra Axxess ASWC-1
All parts were available on Amazon, eBay, or direct from the manufacturer.
Install went super easy. Match the colored wires from the car harness to the head unit harness and plug the labled RCAs into the pre-amps on the head unit.
Didn't have to cut any wires. I did have to source two wires though and I used T-taps for those. 1) 12v switched, energized when key is turned from LOCK to OFF 2) Illumination/Dimmer
1) 12v switched - Thanks to swedespeed7 this was very easy to find.
2) Illumination/Dimmer - sourced this from the cigarette lighter/power port. Basically same as what iamamused did.