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but the tow bar shop will have a harness that simply clips in to the existing harness as a piggy back arrangement
as the shop to have it fitted when you get the bar fitted
as a tow bar is a modification to the original vehicle specifications , you will need a modification plate to make the fitment legal and that is supplied by the shop doing the modification
dont bother as it wont be long before you can use your mobile phone for satnav(we already have them in europe.....) hand held/cars fitted with satnav are old hat and EXPENSIVE for what you get.(the apple iphone is one. )
if hinges are in good order, then ,with the door ajar "adjust" by grabbing hold of the bottom of the door edge and lifting upwards a little at a time to get correct fit,a common problem with heavy doors nowadays....
Your A3 should sound a warning beep if you leave your lights on. For this to happen the light switch would be in the side, or dipped position, the key out of the ignition and the drivers door open. If it does not sound the car may not be getting either the door or key signal. To check the key out signal, key the ignition to the on position, turn on the radio (probably only work if a standard radio is still fitted) then key off and remove key, if the radio goes off, its a good sign thats ok. For the door signal make sure opening the drivers door brings on the interior light on, this shows it recognises when its open. Let me know if anymore advise is needed.
As for the mic wiring, as far as I'm aware there were no standard/optional phone kits for this age A3.
Hi, had total issues with this too! Your back speakers arent going because they are amped by the factory amp in the boot. You have to provide power to the amp so that it will turn the rear speakers on. This was a white and black striped wire in my car (Audi A3 1997) The rear speakers are blue /green and brown/red (left rear) , and the LH rear is brown/red and (forgotten colour) but the wire on the bottom left under those two brown/red wires on the 20pin harness. If you wire it all up like this then your rears should be going :)