06 vw passat wiring harness

**dirtylarry** · 01-01-2006, 02:56 PM

yeah piece of ****. the stupid ****ty car has no acc+ wire. i don't know how it works, the piece of ****. there's 5 wires- ground wire, 2, count them TWO, battery leads, and 2 wires that i don't know what they do. and then there's the speaker wires, 8 of them.

i used the old head unit, and just used the 5 wires

1. the head unit will power off with just these 5 wires
2. the head unit will light on and off with the headlight switch

when i apply a voltmeter to these wires, none of the numbers change when you turn the car on and off (except the voltages goes from 14.0 to 13.blah blah and drops to @ 12 and some change when i turn the car off, no alternator at work to keep the battery at 14) and no numbers change when i turn the headlights on and off. i've tried for 2 hours for every different wiring combo to get the numbers to change. which seems to me to be impossible that the head unit knows that the headlights are on or off without a voltage change, or that it's turning on or off with the key without any change in voltage.

here's another question. i found the crutchfield harness. it has just the yellow and black leads, and a red lead that has a long wire, not part of the harness. you need to wire the red wire to the acc+ switch, the ignition. how can i do that directly to the fuse box and not to the ignition itself. the ignition is a new key, actually the remote is the key, no "key" to the car, like other keys. no grooves, just a square that goes into another square. so i don't want to mess with that. prob sensors for chips in the key, and i don't have the patience for that. so is there a way to wire the acc+ to the fuse so the head unit will power on when the key is in the ignition?

**dirtylarry** · 01-01-2006, 09:23 PM

bump

**stapan** · 01-01-2006, 10:09 PM

you could get a VW service manual for your car. a quick google search for "2006 passat service manual" the first link sells it for $99. probably can find it cheaper

**rowat** · 01-01-2006, 10:25 PM

Figure out which of your fuses runs something that only works with the switch in acc mode. Like power windows or rear defroster. Then tap off that, you can get an adaptor that slides over a fuse and gives you a male spade terminal that you can connect a wire with a crimped female spade on, feed that up and to your radio. If its important to you, you might also want to figure out which of the accessories do and don't drop out while cranking, and tap into one that doesn't drop out.

**rowat** · 01-01-2006, 10:29 PM

Btw, I think its common among all recent VW's that there is no true acc in the harness. It uses some weird pulsed line to turn it on and keep it on, its probably also used in the feedback for the speed sensitive volume in the factory radios.

**andro** · 02-28-2006, 04:46 AM

Hey dirtylarry!

It's been a while since this topic has been started, but I hope my experience will still help you.

Watch out what you do with connections! They can break your car!!

The wiring that you have is now standard on new ones - also Golf, Jetta, Touran,... There are, indeed, two ACC+ wires, ground, and two CAN-BUS wires - these are the two are the ones you won't want to mess with, since the whole car is connected to the CAN-BUS! All the information is transferred using the CAN-BUS, therefore to connect a standard radio you need a CAN-BUS adapter. For my install in a 06 Passat, I'm using a Blaupunkt wire harness adapter (can give you the part number if you need it), it goes for approx. $120, at least here, and it gives you all the outputs you need - the constant power, the switched power, illumination signal (though this is not really an on-off signal, it is an interval signal where the interval changes depending on the brightness of the illumination), the speed signal, and also the interface to the multifunction display and the steering wheel controls. Probably all radios will not benefit from all signal, but at least some signals can be used for anything you install.

**alangonda2006** · 06-09-2006, 02:06 AM

Hey Andro!

I hope you still give attention to this forum thread.

I have a question for you. Where did you get that Blaupunkt wire harness adapter that gives the constant power, the switched power and the illumination signal to the radio unit?

Does that harness work with an original VW double din monsoon stereo? I'm trying to make this radio unit work with my '05 Jetta (that came with a single-din radio unit factory-installed).

Thanks!

**alangonda2006** · 06-09-2006, 02:21 AM

Hi rowat!

Is there a way to make a vw double din monsoon radio work with a '05 Jetta that came with a single-din radio installed?

I've got problems with the power source (I have to turn the radio manually, doesn't work with the ignition key) as well as the radio illumination (dimmer).

Thanks!

**andro** · 06-09-2006, 04:06 AM

Hi Alan (I guess?

)!

I still follow everything, don't worry, it's called subscribe to thread and forget to unsubscribe when you don't really care that much any more

The Blaupunkt wire harness was provided for me by my local Blaupunkt dealer, it's a standard one for CAN bus VWs. I don't know though enough about the Monsoon stereo - I don't know what connections it requires, so I can't really tell you whether this will work or not...

**alangonda2006** · 06-09-2006, 11:36 AM

I guess the monsoon radio has the same connections as yours, but i guess this is irrelevant...

The point is, how did you actually make the harness replacement? Did you replace the original harness with the Blaupunkt one? How does this harness connect to the can bus?

How did you make the connections so your radio would make the dimmer work?