Can an aftermarket headunit stay on after you shut off the car, key in ignition

[quicksilver_S]

I dont know which wire to tap my accessories wire to that can keep my aftermarket radio on until I pull the key out of the ignition. I know some VW has this capability and Im sure audi does too. If I follow the write up, the radio shut off as soon as the can shuts off.

any help would be greatly appreciated.

TIA.

[Grobby1]

I am sure you have left your key in your car and the car dings or beeps at you. Most new cars have what is called a "key sense" wire. This detects the presence of the key in the key cylinder. This is a low voltage wire. So if you wanted to do this you would have to figure out the polarity of this wire (some cars are positive and some are negitive). Once you had figured it out you would have to use that to trigger a relay and use that to power the accessory wire on your head unit (the red wire). If you have any questions please feel free to send me a pm. Hope this helps.

[quicksilver_S]

Do you happen to know what color wire it is on the ignition side? I do hear the door ding so I would think that there is a 'key sense' somewhere in that circuit.

Thanks for your help.

[Grobby1]

Sorry for the slow reply but I have been SUPER busy at work and havent been checking AZ that much. Well I can do some searching...What model and year is your car? I will see what I can come up with. If worse comes to worse I can call my old shop and they can hook me up. Just let me know model and year.