Stereo broke my car?

[Woll]

Just fitted a New Pioneer DEH-X3500UI. Bit fiddly to get it to seat properly but got there in the end. Then I decided to try it out. Radio worked fine, put a cd in all fine, Aux to my phone worked fine. So I thought i'd see if changing the stereo helped with the quality of the sound.
Listened to a few different tracks, It was sounding well. So I thought i'd see how it handled the bass. Put Bass Cannon on lol, turned the bass up. The screen on the hu flickered. Turned it down a little bit 'cos the door cards were rattling. Then the screen flickered again, went off and the sound stopped.
Took the stereo out, checked the connections which were all fine. Then decided to check for power. Got power at the right wires, so that's not the problem. So I thought i'd check the old stereo see if that worked. Plugged it in and it just says safe. Left it for nearly 2 hours now and it won't come off safe.
Went to park the car out the way and the engine management light is on. Code is P0600.
Serial Comm. Link (Data Bus) Message Missing. Please tell me this is something simple and It hasn't fried my ecu. Surely the stereo and speakers aren't wired in via the ecu?
And any ideas on what could be wrong with the stereo?

 

[Seatmann]

Mmm maybe the k-line, grey/white wire goes to everything for diagnostics and they can get fried with aftermarket HU's. Check the pin out readings from the OBD port

http://pinoutsguide.com/CarElectronics/volkswagen_obd2_pinout.shtml

 

[Woll]

Just has my multi meter out. Only 1v going in through ign feed. Thats the problem. **** knows why I got that error code. Put a wire in the battery feed to the ign feed n it works. Light hasn't returned since I cleared the code.

 

[Woll]

Well I've made a temporary bodge and just put a bit of wire.from the permanent live feed to the ign feed. I've taken the face plate off but I know it will eventually flatten the battery. Anybody got any ideas why I'm only gettin 1v to the ign feed? Where does the ign feed come from? I may just re-wire it.
And is it possible that the error code is something to do with the 109 relay? I just took it for a run to make sure it's ok n the glow plug lights didn't come on and.it was dodgy starting then conked out like it did before I replaced the 109.

 

[DEAN0]

Anybody got any ideas why I'm only gettin 1v to the ign feed? Where does the ign feed come from?

Ignition live on the MK4 comes from the central convenience module - thats why you can use the OEM stereo for an hour without the keys in the ignition.

Best ignition live feed to take is from the Cigarette lighter to the ignition live of the head unit.

Check ALL the fuses in the fuse box - there is more than 1 fuse linked to the central convenience module.

 

[Woll]

Where can I find that.module? Is it linked to the cig lighter? I ask because if I put my phone charger into the cig lighter it takesa good half hour to charge 1% so I'm wondering if that has the same problem. I've continuity tested every.fuse and they're.all good.

 

[DEAN0]

Where can I find that.module? Is it linked to the cig lighter? I ask because if I put my phone charger into the cig lighter it takesa good half hour to charge 1% so I'm wondering if that has the same problem. I've continuity tested every.fuse and they're.all good.

Fuse layout here - http://www.seatcupra.net/forums/showpost.php?p=2692983&postcount=19

Cig lighter is fuse 49.

Don't have the manual for the MK4 any more and can't remember where its located.

Have you looked at the fuses on the battery ?