OK,
So here's a diagram I created myself for depicting what was basically done to my Leon to have the mic working back again after retrofitting my RNS 315 HU and enabling its BT funtion:
Green block pinout (found at the HU quadlock connector):
1 – Microphone input, negative
2 – AUX output, audio, right
3 – AUX output, common signal earth
4 – Microphone output, negative
5 – Telephone audio input signal left, negative
6 – Telephone audio input signal right, negative
7 – Microphone input, positive
8 – AUX output, audio, left
9 – Microphone output, positive
10 – Telephone mute (mute switch for radio)
11 – Telephone audio input signal left, positive
12 – Telephone audio input signal right, positive
Blue block pinout (found at the BT module connector):
1 V+
2 V-
3 Telephone ON
8 Audio LF Signal out +
9 Audio LF Signal Out –
10 Screening Term 31
11 Mic in +
12 Mic in -
15 K Line
16 Mute
17 CAN Hi
18 Can Lo
37 Switched positive term for phone charging
39 Term 31 -ve
41 Interface to mob phone Term 30
42 Mic Out +
43 Mic out -
44 Screening Term 31
45 Audio LF Sig input +
46 Audio LF Sig Input -
47 Wakeup lead to phone bracket
49 Serial Tx comms with tele bracket +ve 50 Serial Tx comms with tele bracket -ve
51 Serial Rx comms with tele bracket +ve
52 Serial Rx comms with tele bracket -ve
Nothing really special, as you can see here, the green and yellow wires were bridged from the originally installed mic wires connected to the BT module, and then connected to the HU through the quadlock connector. Since the BT module will no longer be necessary, instead of doing this, one could simply de-solder the original wires from the BT module connector (blue and black ones in this image), and have them directly soldered to the HU green housing block attached to the quadlock connector (having in mind polarities, of course).
Unfortunately, I can't show you more detailed pictures of the actual process; as mentioned before, the Stealers took care of the nasty part. All I know is they had to take apart the car's carpet at the passenger's side to gain access to the involved wiring harness that runs from below the passenger's seat to the dashboard. Pillar trims won't require to be removed since we already have a mic installed from factory.
For a neat job, the following wires should be taken in consideration:
(Image provided by bigbadvoodooguru from golfmkv.com forum)
NOTE #1
Some level of tech expertise is required since you'll want all your wirings correctly soldered and isolated. If you don't think you're up to it, just have someone qualified do it for you.
NOTE #2
Factory BT module
must be disconnected, otherwise, it will be detected as the main BT provider overriding the RNS's one.
NOTE #3
From my experience, no further
coding was required through VCDS to have the HU's BT enabled, it should come enabled by default. However, what you will require to do at VCDS (if you haven't taken care of it already) is enable/install the Navigation module from the control module section (if you don't know how, just let me know and I'll post the instructions).
Also, when doing a full scan through VCDS, the Telephony module will throw an error code. This is normal because we will no longer have an external physical BT unit installed. You could have this module removed/uninstalled at VCDS, however, I don't recommend it, all you'll get is the telephone menu gone from your MDI screen and you'll only be able to manipulate your phone contacts and calls directly from the RNS's screen.
This is basically it. Got questions? Just ask.
Hope it's helpful enough.
Cheers!
