Question about 2005 Audi A3

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Radio wiring problem 2001 Audi A3

Rear speakers/sub-woofer intermittently used to cut in and out. Appeared to improve the longer the radio/cd player was left on. Replaced the radio for a Kenwood set, however the wiring appears quite different and I have no rear speakers at all now. Does anyone know the correct colour wires for the rear speakers and which wires power the sub-woofer? I'm a self employed mechanic, but to my shame I'm lost on this one. Many thanks.

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  • chalkymon
    chalkymon Oct 14, 2010

    Sincere apologies for the length of time getting back to you mate. Thanks for the input. The sub/amp itself was the fault in the end. Another £200 repair :( Thanks again. All the best. Chalkymon

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Hi, had total issues with this too! Your back speakers arent going because they are amped by the factory amp in the boot. You have to provide power to the amp so that it will turn the rear speakers on. This was a white and black striped wire in my car (Audi A3 1997) The rear speakers are blue /green and brown/red (left rear) , and the LH rear is brown/red and (forgotten colour) but the wire on the bottom left under those two brown/red wires on the 20pin harness. If you wire it all up like this then your rears should be going :)

Posted on Apr 28, 2009

Testimonial: "So sorry for the very long delay in replying to your advice. It was the sub/amp in the boot as you correctly guessed. Another £200! Many thanks Pal"

  • 1 more comment 
  • alex b43 Jan 28, 2011

    Where is this 20pin connector behind the headunit or in the boot near the sub

  • alex b43 Jan 28, 2011

    Where is this 20pin connector behind the headunit or in the boot near the sub

  • Natasha Bell Apr 15, 2011

    behind the head unit :)

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