JMB RetrofitsChris Nott
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  1. #1
    Anito's Avatar
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    HU getting power when I open the door

    Guys,

    I have a lovly new B7 S4 with Sat Nav (Pics will follow). I've noticed that if I either open the boot, one of the doors or unlock the car the HU is spinning up the satnav DVD. After a few seconds it goes back to sleep.

    No key in the ignition and th HU itself is off.

    Is this correct?

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  3. #2
    imported_craigyjp
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    Re: HU getting power when I open the door

    I think that is quite normal, when you open the door, the car is getting ready for you.

  4. #3
    Anito's Avatar
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    Re: HU getting power when I open the door

    You think?

    I don't understand why this would be, afterall when I put the key in everything is up and functioning in less than a second anyway.

    To me it's a needless drain on the battery.

  5. #4
    imported_craigyjp
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    Re: HU getting power when I open the door

    When you unlock your car, it comes alive and the canbus sends a signal from the central convenience to the nav unit, it then wakes up and gets ready for action.

    I would guess it also starts the GPS antenna so a fix is more readily available before you start the engine too.

    Another waste of the battery?

    Not really as the drain is minimal on a car battery.

  6. #5
    Anito's Avatar
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    Re: HU getting power when I open the door

    ok, so it's by design then.. Thanks.

 

 

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