OK...So, I'm not 100% done but I have this for the most part complete. I'm not the best at documentation so sorry for the not so complete "instructions". The main thing is being prepared before starting. The first thing you need IF installing a Pioneer head unit will be the Pioneer ADT VA-133 Cage. Pioneer for some reason does not include the cage and bezel with their DD head units, apparently the assumed you're installing in a direct fit or something. I also used the metra wiring harness, which does not include a spot for ignition/switched wire. I was not going to pay $80-$120 for the PAC-CAN unit.
Next thing you should seriously consider if you don't have...a Dremel! One serious mistake I made when starting this was thinking I was going to be done in an hour. I really should have waited till the weekend (which I'll now be doing again) and taking the ENTIRE center console and dash....When trying to shove the NAV unit and all the wires in...it's be a lot better to have everything off to pull and push.
Ok, so I skipped the steps of taking out the factory head unit, but it was fairly easy. I personally did not get the VW radio keys. I just ground down a couple of flat standard radio removal tools and slowly got it out. Would have been easier with the right tools for sure!
Alright, so in the above picture you'll see the cage (fits VERY snug) and what I did was on each of the red circles marked with a razor blade the outside of the "push locks". I took the cage out and used the dremel to take out some of the plastic. It took a couple times to get the fit right, but I got it to lock in there very nicely. Ok, at this point I decided I was not going to cut out too much plastic to make it perfectly fit. I don't know when I'll want to take this out and put a factory unit back in for whatever reason. IF you cut back the plastic where the yellow lines are...you can get the cage and head unit to fit PERFECT.
So, like I said, you should really just go ahead and take out everything around the dash and under the steering wheel, helps a lot. For the ignition/switched wire for the head unit I used the 75x spot on the power distribution block. This is only temporary. I did this for brevity right now, this weekend I need to pull everything back out and hook up the GPS antenna, VSS wire and will be switching this to the "key sense" wire so that it will stay on after the car is turned off, similar to the factory units
I soon found that I would need to dremel off a bit of the factory support. Didn't really harm anything by taking it off though, no worries. Red arrows indicate what I took off.
Because of the overall size of this thing...It was an absolute "you know what" to get this thing to sit properly. That is why it is necessary to just take it all off! I had to put my hands in some awkward holes and angles Got it all in and I was pleased with the overall outcome. Obviously I would have appreciate it being a little more flush, but I'm just not ok with cutting more plastic than necessary. As much as I love my Jetta...I think this head unit will out live the Jetta (in my driveway at least). The rest are just for show, but I will be updating this with more detailed pictures and others from when I tap into VSS, key sense and reverse. In case you're wondering, yes I did do the parking break bypass.
Please feel free to critique. I know there is a similar write up on Vortex, but no harm in having one here I suppose. After seeing my interior, I'll answer your unasked question...Yes I know it looks like crap so when I rip it all out again I will be sanding and painting a lot of the smaller trim pieces and door pieces, as well as the radio bezel. First impressions so far...Wow, I knew any aftermarket unit would improve sound quality, but damn this thing sounds great with the factory speakers. Will be at some point swapping them with pioneer.