[MTCB Android Head Units Q&A] maverick_37:
Hi Reptile,

After having some time this weekend I decided to open up my headunit and making some changes on the bluetooth mic.

For me calling from the car is unfortuantly a necessary thing for my job.

Also I wanted to change the reception of the Wifi and install the fan after reading that a lot of issues with the Wifi could also be related to a heat problem.

I'm writing this because I had a lot of help finding out my problems on this forum and wanted to do something in return so that other people might benefit from this sort of tutorial.

First, following Nir's (dnts) guide on how to change the BT mic issue did the trick for the external mic.

As I have a KGL unit it is slightly different on the component to remove.

I used a shielded cable similair to the cable from a headphone to connect the external mic to the bluetooth card.

The "ground" wire I connected it as well on the card, in the guide from Nir I could not see clear how he did that.

On the KGL you need to remove C102 and not C32 as described in the guide from Nir, this one is also close to the bluetooth card.

Mine is for a Skoda Octavia 2014 model, so hopefully some else has this unit because there are still some questions about this, but that's for later on.

The second part from the guide I didn't do (yet) the internal mic is quit well hidden in the front facade.

Testing the external mic gave a whole lot better satisfaction to the person on the other end of the call than at first, so definitly an improvement.

I'm still waiting on the amplifier pcb to boost the mic, someone posted to use the arduino for that so that is for the next step :D

Maybe I will also change then the internal mic following the rest of the guide.

After that I modified the antenna for the Wifi.

Eventhough it looked a lot better than many described in their unit, having just a small piece of wiring for the antenna.

This one had a small copper strip at the end attached to the back of the front with double sided tape.

Desoldered the antenna and replaced it with a standard cable with connector at the end that you can use for a standard Wifi card in a laptop.

Put the connector in one of the free slots at the back and attached an external antenna.

Reception is much better, I now finally can connect in a proper way to the Wifi from my house without losing the connection multiple times like before.

Also driving through the street I'm picking up a lot of signal from other routers that it didn't do before.

For the last part I installed a fan like you discribed, used a silent noise version.

Reading somewhere else on the forum about using the amplifier cable I decided to find out on the PCB where the cable was connected on the connector for the the power, speakers and amplifier.

I ended up soldering the wires from the fan on the back of the PCB where the amplifier cable and ground are going out/in of the unit.

I put some photos to clarify what I did so that it might give you a better idea on how I did this.

So, now coming back on the question that I have.

On the power cable is an extra connector that you can use on one of three connectors from the original unit.

It has a usb connector attached to it for power or data not sure but connecting it to one of the three connectors it does do nothing.

I'm still wondering if this for the factory usb connector that I have in my console or for to display information in my dashboard between the dials.

A lot of options I had with the Amundsen radio are not working anymore, so if anyone knows what it is for, please let me know.

Other that I wanted to ask.

Is it possible to change the layout from the phonebook for the bluetooth, say like something you have on your telephone.

The layout is not really practical and missing more than once names when someone is calling me, ending up looking on my telephone who it is.

Also using the SWC it works but the dispay between the dials says no phone connected so i cannot use that list to scroll through the contacts.

Thanks everyone for your help on getting the unit better and better.

Below I put a link for the photos I made.

https://www.dropbox.com/sc/qv32j76y19xvwda/AAC9WNt6X8Nmrfqxnp2DRLuaa