I installed a bluetooth in my wife's 09 Tiguan today, and the install was actually easier than I was anticipating.
I bought a 9w2 unit off vw_parts_aus (let me know if it's not OK to mention an eBay seller and I'll edit it out). He was very knowledgable about the different bluetooth units available and was able to recommend the one that would have the best set of features for my (and my wife's) requirements.
The 9w2 is the entry-level bluetooth module - it doesn't integrate with the MFA or with the display on the head unit, but critically it does integrate with the steering wheel buttons and the install is 100% stealth.
With the basic RCD310 installed, and having a red MFA, there were no VW factory options that would provide calling number display in either the MFA or the headunit. If I were to upgrade to a RCD510 or RNS510, then the 9w7 bluetooth module would show calling numbers on the headunit. If her car had a white MFA then the 9w7 would also display calling information in the MFA as well, but the 9w7 wouldn't have integrated with the steering wheel controls unless I had the white MFA.
There are also protocol converters that will allow a 9w7 to work with the red MFA, but I just needed basic functionality and to be able to use the steering wheel buttons for true handsfree calling.
The unit arrived as a plastic bluetooth module that slides into a closed-cell foam housing. The housing is cleverly designed to install under the driver's seat - there are even pre-cut areas of the carpet that you can remove and it quite literally slots right in to place.
From the bluetooth unit, you run the wiring loom under the carpet to the centre console and up to the back of the headunit.
Now, go and disconnect the battery before you take out the headunit. The headunit is pretty easy to remove without any special tools required (except for a Torx T20 driver).
To remove the plastic bezel from around the headunit, pull out the card holder and the blanking plate next to it, undo two T20 screws behind them and then the bezel is easy to clip off.
Then, there are 4 T20 screws holding the headunit in, remove these and you can just lift the headunit out. Remove the wiring loom from the rear of the headunit, plug in the cable from the bluetooth module and then plug the original cable into the bluetooth module's cable. Put it all back together again.
Next, feed the microphone cable behind the dash on the driver's side. Once you get over to the fusebox, head up and you want to thread it in the A pillar. Feed it along the windscreen side of the A-pillar, making sure that the cable doesn't go over the top of the airbag.
Next, remove the plastic cover from where the microphone will live, up next to the interior lights in the centre of the windscreen. You'll then have access to two T20 screws which can be undone and the main module in the console drops down. Unplug the blue plug and remove the module. In my case, there was a black foam block installed in the place where the microphone should be installed. Remove the foam and click the mic into it's holder. It will only go in one way.
Remove the sun visor from the driver's side and now the only tricky bit is to feed the cable through the headliner and grab it over in the centre. Once this has been achieved, connect it to the mic and put everything back together again.
I was fortunate in that the 9w2 module I received had already been coded, and the vehicle also seems to have been coded, so once I hooked up the battery again, I was able to start the engine, pair with the bluetooth and begin receiving calls.
The audio quality is good, and there is minimal to no echo. It mutes any music that's playing when the phone rings and you can use the phone button on the steering wheel to answer and end calls.
You can't dial calls through this module, so I'm going to install the phone in a charging cradle on the dash or the windscreen so that calls can be made, the phone can be charged and GPS on the phone can be used while driving.
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