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Aftermarket radio problem with VAG-COM?

Dean_T Sep 4, 2004

  1. Dean_T

    Dean_T Active Member

    i was reading the ross-tech site and came across something mentioned on there regarding aftermarket radios possibly damaging vag-com units at dealers;


    is this actually true?

    anyone had any problems with this at all?

    i have my eye on a replacement becker HU but this has put the plains on hold! /ubbthreads/images/graemlins/frown.gif

  2. AndyMac

    AndyMac Moderator Staff Member Moderator

    Sounds feasible, but the K BUS on a Concert & Symphony is opposite the switched power connector (3 along from the perm live), and this is unused by most head units so I don't see how this could end up shorted to 12v.
    Both our Audi's have Alpine HU's with no adapters, ISO power lead plugged straight in, and VAG-COM hasn't been effected. I gues if you're using a power ISO adapter of some sort this may be doing something to connect the K BUS to 12v, but you don't need an adapter for power, just possibly need to swap the perm live & switched live over in some cases which can be done using a standard male & female ISO power connector if you don't want to cut the Audi loom. Also it would only produce the 12v if the HU was switched on while the VAG-COM was connected, so as long as the HU is off it can't do any damage.
  3. Dean_T

    Dean_T Active Member

    fantastic, exactly what i wanted to hear /ubbthreads/images/graemlins/smile.gif

    i knew lots of people were running aftermarket HUs on here, i just dont want to be in the position of blowing VAG-COMS left, right and centre after changing mine

    i need MP3 capability as the constant cd changing in the boot is starting to annoy me

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