Motorola HF850 Passat wiring

Looking for any information on installing a HF850 bluetooth hands free kit in a 2003 Passat. Searched everywhere on the web for wiring diagrams or harness kits. Nothing found. Local VW dealer no help. I can probably figure it out given time/effort, but prefer the educated approach.

I have never installed one of these units...what type of info do you need about the car?

I just installed a a similar unit, the Motorola IHF1000. I originally bought this unit for a 2007 Volkswagen EOS but ended up installing it in my 1999 Toyota Avalon. I think the physical connections of the 850 and 1000 are similar, just a slightly different feature-set. The IHF1000 can mute the HU if the HU has an Interrupt lead and it can interface with the car speakers (when interrupted). I opted to use the supplied speaker instead of the car speakers in order to minimize feedback. Works great! I did wire in the Interrupt lead. Also works perfect! In terms of a harness to wire the these units into your Passat, my guess is that you'll only need one if you plan to ditch the Motorola speaker and wire it into your Passat speakers. In that case (and I am no expert by a long stretch), you may want to look for a Metra brand Y Harness for the Passat factory head unit. Or maybe you can make one using the 2 Metra harnesses below. You could wire them together, then add the speaker leads from the BT harness to the speaker leads in your custom harness before soldering and heat shrinking your splices. Metra includes pin outs on the packaging for their harnesses (the 1 I ordered anyway). From that, you'll know what wires you'll need. From the12volt.com site: 2003 Metra Application Guide 2002-2003 Volkswagen Passat (Double-Din)       Harness Into Car        70-9003 Harness Into Factory Radio 71-9003 In close, I wanted to mention that I chickened out of installing the Motorola IHF1000 unit in my wife's new EOS. It's a convertible so the A-pillar is a bit solid/complicated and the trim on the A-pillar and the narrow trim at the top of the windshield is incredibly tight. I just can't bring myself to squeeze in the hook tools and start yanking. I have no idea where the clips are and not sure if there are screws to remove first etc. No idea if there is room in the dash to hide the BT module. Rather tight on space for the speaker and not ready to hack the HU harness. Chicken!!! (me) Jim

Steve, Ah, "doing it in stages", great idea. Baby steps, each building on the other. So long as you have the time (your own project, not a customer's car). Master5 pretty much gave me the same advice on my Avalon project. I am in no hurry so slow and steady as she goes is working well. In terms of voice dialing and a finicky Moto phone, when you use the 850 (or at least with my 1000), I "think" the Moto BT HF module will be doing the voice interpretation, then compel the phone to dial. I know with the 1000, my voice commands are stored in the 1000 itself. I have my mic near the top of the A-pillar in the Avalon and it works awesome. Maybe when project Avalon is complete, I'll have enough confidence to consider pulling the EOS apart Keep in touch on your project. Jim

Steve, Ah, "doing it in stages", great idea. Baby steps, each building on the other. So long as you have the time (your own project, not a customer's car). Master5 pretty much gave me the same advice on my Avalon project. I am in no hurry so slow and steady as she goes is working well. In terms of voice dialing and a finicky Moto phone, when you use the 850 (or at least with my 1000), I "think" the Moto BT HF module will be doing the voice interpretation, then compel the phone to dial. I know with the 1000, my voice commands are stored in the 1000 itself. I have my mic near the top of the A-pillar in the Avalon and it works awesome. Maybe when project Avalon is complete, I'll have enough confidence to consider pulling the EOS apart Keep in touch on your project. Jim