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Intermittent loss of sound from rear door speakers

Discussion in 'In-Car Entertainment' started by amimmortal, Jul 6, 2012.

  1. amimmortal
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    amimmortal Member

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    [Jul 6, 2012]
    Hi all,

    I'm experiencing intermittent loss of sound from the rear door speakers. I'm guessing a loose connection because it has a habit of coming and going depending on whether or not I hit a bump in the road.

    It's an A6 avant C5, 2004 Final Edition model with the RNS-e sat nav.

    As an aside, I just fitted a replacement GPS antenna and checked the connections to the rear while I was at it. Everything seems to be fine there, so I'm needing to know where the wiring for the rear speakers is located so I can check the connections.

    I'm assuming it's not the speakers themselves as they both go on and off together, so it's more likely a connection back to the amplifier.

    Can anyone point me in the right direction?

    Thanks in advance,

    A.
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  3. amimmortal
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    amimmortal Member

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    [Dec 28, 2012]
    #2
  4. NHN
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    [Dec 29, 2012]
    Check the connections in the door pillars, wires fray/break there often.
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  5. amimmortal
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    amimmortal Member

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    [Dec 31, 2012]
    Hi there,

    Are you talking about where the wires go through the rubber boot to the door?

    Thanks,

    AndrewC
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  6. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Dec 31, 2012]
    Yes you need to prise off the rubber boot. If both left & right speakers cut out at the same time then it's unlikely to be the door connectors. They are prone to intermittently cutting out but independent of each other, and whacking the volume up usually brings them back to life. Would be the rear amp cutting out for some reason, check the connector on it.
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  7. B5NUT
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    B5NUT Well-Known Member VCDS Map User

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    [Dec 31, 2012]
    As you say both speakers go on and off at the same time I would start by looking at the AMP as they power the rear speakers (unless you have bose then all the speakes rare powered off the AMP) Check the plug on the sub housing for any signs of corrosion on the pins and have a look on ebay for a replacement SUB/AMP. The AMP on a non-bose car should be built into the rear sub housing.
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  8. NHN
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    [Jan 1, 2013]
    My only reason for the said pillar areas is I've seen it before & it's generally when he goes over bumps, so if they're frayed in the rubber boot, it could be shorting/momentarily losing connection, which I guess could also be a dodgy corroded connector, anyway report back for future reference :)
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  9. amimmortal
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    amimmortal Member

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    [Jan 13, 2013]
    Hi all,

    I spoke to a local auto electrician who had some experience with the C5 A6 Avant audio system. He mentioned that the likely cause would be moisture in the electrics, caused by water ingress either at the head unit, along the length of the loom, or in the boot at the subwoofer.

    I mentioned to him that I'd had a problem with a coolant leak from the heater matrix, which after much gnashing of teeth, was sorted by way of some K-Seal, rather than doing the whole dash-out job...

    As soon as I said that, he confidently suggested that the problem was most likely caused by moisture from the heater matrix leak getting into the connections at the back of the head unit (the heater matrix is right behind the RNS-e head unit). He said to check for corrosion and other water staining, and to check to ensure the loom was dry.

    Hopefully, this should be relatively straightforward to fix.

    Does anyone have any experience of this?

    Thanks,

    A.
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  10. NHN
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    [Jan 14, 2013]
    Removing head unit is fairly simple, so is checking rns connections.
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