HELP!!! What did I do electrically???

[SkyRyder55]

Ok, 2003 Jetta wagon.
I just installed a new double din head unit. As per a Jettajunkie.com
http://jettajunkie.com/vw-jetta/showthread.php?14287-Installing-a-double-din-on-the-MKIV
I cut the power feed from car harness and ran the wire to the 75x terminal.
Now I have no horn, no windows, sunroof, and it thinks a door is constantly open now. So if I turn on headlights it beeps at me.
What did I do wrong here?

 

[Seatman]

Sure you got the right wire? Sounds like you've hit something for the ccm.

Or, I think the ccm takes power from the same place, would a bad earth on the stereo cause issues at the ccm?

If you unplug the stereo does it all go back to normal?

 

[SkyRyder55]

I dunno. I'm going to get back into it tonight.
I'll try disconnecting stereo. It is an aftermarket unit.

 

[Seatman]

Yeh I'd start there and work backwards, you could also maybe hook up vagcom, it might have a fault stored in the ccm and with that and the pin outs you might get a better idea of what's happening.

So much easier over here, our cars come with a standardised European plug fitting so no chopping required.

 

[Vince Waldon]

About to do this job myself and I'm thinking it would be a good idea to put an inline fuse on the line between 75X and the stereo.

The guy on the link doesn't do it.. but I'm pretty sure terminal 75X is only fused with one of the big-ass fuses on top of the battery... and for my own piece of mind I want a fault on the stereo to melt a 10A fuse before it melts the wiring while it waits for the big fuse to blow.

 

[turbocharged798]

Your car will burn before the big fuse ever blows.

OP: sounds like you messed with the can-bus wires. They are usually a twisted pair of wires that run to the radio. You need to isolate these as many modules communicate over that bus. Its like USB for your car.

 

[SkyRyder55]

I assume that is the blue block of wires in the main connector. They are not actually connected to anything now as there is no provision for them in the universal harness adapter.
So what do I do with them?
Or do I have to relegate myself to manually turning off radio every time I get out of the car?

 

[Vince Waldon]

Done right.. wiring switched power from 75x should do what you want... stereo goes on and off with the key.

The question is... what went sideways?

Always hard to troubleshoot wiring issues without standing in front of it or looking at pictures. If you unplug everything that you did does the car start to behave?

Odds are something in the "universal harness" is making incorrect assumptions about your car's wiring... unplugging it would be one way to narrow it down.

 

[turbocharged798]

I assume that is the blue block of wires in the main connector. They are not actually connected to anything now as there is no provision for them in the universal harness adapter.
So what do I do with them?
Or do I have to relegate myself to manually turning off radio every time I get out of the car?

Nope, the can wires are with the power/ground wires IIRC. The plug you are talking about is for an external CD changer.

 

[Vince Waldon]

The plug you are talking about is for an external CD changer.

...the so-called "6-Pack".. which may or may not be in that hole with a flap on it, left wall of the trunk.

 

[NarfBLAST]

Check fuse #14

http://forums.tdiclub.com/showthread.php?t=386859

 

[SkyRyder55]

OK so radio disconnected and all is back to normal. So that's good.
Solved the problem.
Was a stupid assumption on my part. There are 3 brown wires in adapter harness all labelled mute. On the deck there is a brown for phone mute. I twisted and soldered all together. Obv not the right idea.

 

[Seatman]

OK so radio disconnected and all is back to normal. So that's good.
Solved the problem.
Was a stupid assumption on my part. There are 3 brown wires in adapter harness all labelled mute. On the deck there is a brown for phone mute. I twisted and soldered all together. Obv not the right idea.

I feel a face palm moment has just passed

 

[SkyRyder55]

That being said, I don't have dimming with headlights on.

 

[Seatman]

Needs the illumination wire from the car hooked up to the dimming wire on the stereo, not all have it but a number do.