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Audi A3 won't turn over - beeps and flashing brake light

md2k9 Jan 1, 2015

  1. md2k9

    md2k9 New Member

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    Hi All

    Wonder if someone can help. I went out to my car the other morning to be met by the sound of one beep (like the one you get when fuel is low), and then three other beeps followed by a red flashing handbrake light on the dash. The car refuses to do anything with the ignition. Glow lamp bulb stays on too. I have plugged in a VAG COM and attached the output - main culprit seems to be inability to contact the ECU. Anyone any ideas what this might be? I have tried/checked:

    - Taking the ECU from under the scuttlepan to check for any obvious water ingress etc - nothing. Note: I havent disconnected the cables from the ECU as the black metal plate looks like it can only be removed if I take the protective housing off? Didn't fancy this yet....
    - Tested the battery and also replaced it with a known good one - all fine
    - Checked the earth, all appears fine
    - Tested brake bulbs, brake light sensor, all fine

    I'm pretty stuck now and looking for some advice? This may be completely unrelated but I had to replace a small section of rubber fuel hose due to a leak caused by wear and tear, so some diesel will have been sprayed/lost under the hood. The car has since been running though (albeit over a short distance). I also noticed the boot light came on when I went to start the car so it's possible the boot has been open (light left on?) for a day or two. The battery voltage was down to about 11.3 when I first tested it when this initially happened. Like I say these may be complete red herrings but thought I'd give the full picture!

    I've posted similar message elsewhere and getting some useful responses (but none to pinpoint the problem just yet), so thought I would branch out to another forum. Hope that doesn't offend anyone :)

    Any suggestions welcome!
     

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  3. Marshy

    Marshy Settled in Team Sepang Audi RS3

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    I think I'd check all the fuses to see if any have blown,
    Also check the earth strap is good and tight to the body and down to the gearbox.
    Got to be worth a shot.
     
  4. md2k9

    md2k9 New Member

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    Thanks Marshy. I've checked the fuses already - both under the bonnet and driver side interior. Should have mentioned this in my OP. However, I have read that sometimes re-seating the fuses can help so I'm going to try that today. I'll also check the earth to the gearbox is OK - the earth to the body is fine. Thank you.
     
  5. md2k9

    md2k9 New Member

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    So, quick update. I've narrowed this down to the relay in the fuse box under the bonnet. My manually triggering the relay, I can get the engine to fire up. However, a quick test of the relay (by connecting the battery directly to the terminals and then measuring resistance of the other 2 terminal) suggests that the relay is OK.

    If I check voltage where the relay is seated I have approx 12 volts where I expect it, which maybe points to an earthing problem (as Marshy suggested!). Question is - how do I access the cabling underneath the fuse panel? I can remove the main torx screw in the centre of the box which allows me to lift the top section off, but there are still other plastic panels beneath this - how are these removed, and am I looking in the right area for an earth problem??
     
  6. md2k9

    md2k9 New Member

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    Just for closure on this one - finally got this resolved today by an electronics specialist. He found that some of the cabling in the harness underneath the battery tray had corroded and therefore broken - repairing this resolved the issue. Hope that helps someone else one day!
     
    Ibz likes this.
  7. Marshy

    Marshy Settled in Team Sepang Audi RS3

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    Glad you got sorted mate.
    I'm sure it'll help someone on here in the future.
    Cheers
     

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