How do i unlock child unlock on a audi a3 back door

You may have to replace the lock module on the door or the switch on the driver's side that locks the windows if they're connected to the child lock? Normally the child lock is a manual lever on the inside edge of the opened door.
Check your owner's manual. If the physical lever keeps moving you'll have to get inside the door and find out why it won't stay in position.

look for the child safety locking device on the inside --usually a small lever near the lock striker

On the Audi Q7, depending on country and options the child lock is either:

1. On the drivers armrest, near the window switches, there are 2 buttons with a little orange light and a picture of a little baby on them. Deselect both buttons to turn off the child locks.
-OR-
2. Open the passenger doors, there is a small keyhole on the inside of the door above the latch, use your key and turn it 90 degrees to turn off the child lock.

Hope that helps

Pull the switch panel and verify you have power to the panel first.

there is a small notch in the door frame corner,next to the catch, use a key to move the small switch.

what ever you do don't go to a audi shop as it will cost you a £1000.00 with out vat and £32.50 for every half hour of there time. try to resync. switch engine on with spare key and remove the remote fob from the key, shut the door and lock the door with the key within 5 seconds press unlock on the first remote to be coded untill the indicators flash once, wait 5 seconds and press unlock again to confirm this memory position. Remove ignition key and test remote if o.k repeat for other remotes adding extra positions by sitting indicators flash. position 2 will be two flashes. if no flashes then get the fault memory read. This may take a few attempts and lots of sweaing. Regards Samantha

You have the key in the car? if so use a coat hanger to open the door, if not or you can't get the door open call AAA if you have it if not call a lock smith to get it unloked with a slim jim.

you may also have shorted the keyfob battery if you touched the front and back at the same time.joe

Hi John.
Inspect the key fob for a place to open it and check for a battery.
Regards Johngee10