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Thread: head unit nightmare!!

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  1. Angry head unit nightmare!! 
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    hi all,,,i have a 03 plate a4 cabriolet and have changed the head unit to a sony xplod bluetooth unit but for some reason cannot find a switch live and the bluetooth is not working properly i have searched high and low for the correct leads to plug and play does anyone have any suggestions or had the same prob????
     
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  2. Re: head unit nightmare!! 
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    Quote Originally Posted by m40mfa View Post
    hi all,,,i have a 03 plate a4 cabriolet and have changed the head unit to a sony xplod bluetooth unit but for some reason cannot find a switch live and the bluetooth is not working properly i have searched high and low for the correct leads to plug and play does anyone have any suggestions or had the same prob????
    Ideally, you will need to run a switched ignition live from the fuse box.
    Audi's of this age rely on CAN-BUS signals to switch on their head units - hence the continuous live +12v currently at the head unit.

    I found a spare fuse slot and introduced a switch live from an adjacent feed for other accessories, like my Snopeer and originally my TomTom, which I had hardwired.

    See pictures of my fusebox - Note the red 4A fuse amongst the larger ones!
    I used a "blue" flat male spade connector to tap off the ignition +12v rail in the fuse box - I used a couple of wires from an old Nokia car phone kit which had a pre-crimped female spade connector that actually fitted in the fuse box receptacle - you need to pull out the relevant purple retainer strip to fit the new fuse connector.
    Attached Images
    A4 3.0 Quattro Sport Tiptronic (51) Platinum Leather/Heated Front Seats/BOSE/DIS/Cruise Control
    Retrofits: S-Line Bumpers, Amb F&R LEDS, Xenon HID's (slimline) & Headlight Washers, Auto-dipping RVM, Footwell Lights, Parrot CK3100 BT, RNS-E + Video i-pod + Aux inputs, Rear PDC, ISO-FIX, VCDS HEX+USB+CAN (VAG-COM)
     
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  3. Re: head unit nightmare!! 
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    FYI: The Audi "Power" ISO connector has the following connections:
    Connector III:
    Pin 1 : Bose Signal
    Pin 2 : Alarm Ground
    Pin 3 : K-Line
    Pin 4 : not connected
    Pin 5 : not connected
    Pin 6 : not connected
    Pin 7 : +12v (Constant 12v supply)
    Pin 8 : 0v Main Ground

    **** NOTE: Be careful not to feed any signals back to the car wiring through Pin 3, "K-Line" since this is a diagnostic connection. Will interfere with VAG-COM and Audi diagnostic systems - check out this link....
    http://www.ross-tech.com/vag-com/aftermarket-radio.html
    A4 3.0 Quattro Sport Tiptronic (51) Platinum Leather/Heated Front Seats/BOSE/DIS/Cruise Control
    Retrofits: S-Line Bumpers, Amb F&R LEDS, Xenon HID's (slimline) & Headlight Washers, Auto-dipping RVM, Footwell Lights, Parrot CK3100 BT, RNS-E + Video i-pod + Aux inputs, Rear PDC, ISO-FIX, VCDS HEX+USB+CAN (VAG-COM)
     
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  4. Re: head unit nightmare!! 
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    thanks so much for your help woorlord sounding lovely now!!!!!!!
    really appreciate it xxxx sam
     
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