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radio wont turn off with key, help please

Discussion in 'A3/S3 Forum (8L Chassis)' started by jochaleaton, Jun 28, 2008.

  1. jochaleaton
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    jochaleaton New Member

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    [Jun 28, 2008]
    anyone had this trouble before? not long had the a3, its a 98 1.8t, the standard stereo will not turn off when you turn off the igniction and take key out, can anyone shed some light on how to fix please?
    cheers tony
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  3. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Jun 28, 2008]
    With a car that age chances are a previous owner had fitted an aftermarket HU at some stage. They most likely connected the switched power to the perm live (as Audi wire them back to front) instead of just swapping them over. So you now have no switched live going to the HU, and have to switch on/off manually.
    Just pull the HU and take a pic of the black ISO connector on the back so we can see what they've done, should be a really easy fix. The worst part is pulling the HU, get the right removal keys and be very gentle. Don't pull on the keys, remove the glovebox and push the unit out from behind. The spring clips that hold it in are very fragile and you can easily end up with the HU wedged in there.
    There is a chance that when they put the car back to stock to sell it they bought a replacement HU off ebay or the like, and it's the newer style CANBUS operated version. This won't use a switched live, but uses the CANBUS to tell the HU when the keys are in/out. Unfortunately if this is the case there is no way round it, as your car is not a CANBUS equipped vehicle. Does the HU switch off after an hour?
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  4. jochaleaton
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    jochaleaton New Member

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    [Jun 29, 2008]
    hi, yes the unit does switch off after an hour, the origonal hu had a faulty volume switch so i changed it with 1 that my mate had from his v reg a3, the orig unit didnt switch off with key either, is it just a case of swopping the switched and perm lives over?
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  5. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Jun 29, 2008]
    No definately not, if that were the case it would switch on/off properly but lose all it's presets, sounds like it's a CANBUS HU from a 2001+ model. If that's the case it will never work properly. Look at the diagram on the top of the HU, it should have UB+ (perm live) and a seperate S-Kont connection on the bottom power connector. If it has this then you are in luck. If it doesn't then you're stuck with the issue.
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