Trying to install new radio, now caw won't start at all. Battery has full charge. Scan code says anti theaft. What can we do?

You would need a factory scan tool , no way around it . Dealer !

Your battery is not fully charged and may not be accepting a full charge. Remove your battery and put it on a charger overnight. Take the battery to a parts store and have them hook it up. They will then be able to tell if it is taking a full charge or not. If this is a new battery it will take a full charge but it is still getting drained by something such as a radio not shutting off automatically, if you have that option.

Hi Gennea, If the battery runs flat and the radio looses its anti theft code it must be input again before the set can work. The code may be written into the user manual, if not you may have to visit an agent. Regards John

The first thing to do get it checked for DTC'S - diagnostic trouble codes . Not at auto zone or any other parts store , you want to have full scan of all the modules on the car. Don't know how much you know about automotive electronics , computer controlled systems etc.... Your vehicle has at least 10 modules (computers ) on board , there all talk to each other on a serial data network . C.A.N - controller area network . Or in the case of GM it has it's own . GMLAN -
How to Diagnose Controller Area Network CAN When you turn that ignition switch to start it is an input to the computer ,be it the PCM or BCM ..

it is most likely that the radio had an anti theft security code activated & until you re activate the code the radio will not work......hope this helps.......cheers.

IMPORTANT NOTE:
You must have the security anti-theft code for your Audi radio from the car manufacturer, or from an Audi dealer!

You can find the radio code at: http://www.radio-code.co.uk/

The sequence of Audi radio programming is:
1. Push simultaneous "SCAN" and "RDS" keys until on the screen will appear "1000" displayed.
2. Release keys. No more push on "SCAN" and "RDS" keys because otherwise number "1000" will be considered as first safe code attempt.
For example: we have the security code "5079". Then:
3. By the no.# 1 key you will set up the first safe code digit. Push 5 times on the no.# 1 button. The "5" number will be setted.
4. By the no.# 2 key you will set up the second safe code digit. Push 10 times on the no.# 2 button. The "0" number will be setted.
5. By the no.# 3 key you will set up the third safe code digit. Push 7 times on the no.# 3 button. The "7" number will be setted.
6. By the no.# 4 key you will set up the four-th safe code digit. Push 9 times on the no.# 4 button. The "9" number will be setted.
7. Then push again simultaneous "SCAN" and "RDS" keys for confirm this safe code. On the screen will be displayed "SAFE" notice. Release keys! For few seconds a radio frequence will be displayed.
The radio is now ready for use!

The radio is probably locked out due to the antitheft system. It needs to have the security code (PIN) entered to get it working again. If you do not know the PIN. you will have to take the car to the dealer to get them to unlock it for you.

IMPORTANT NOTE: You must have the security anti-theft code for yours VW radio from the car manufacturer! For VW radio the sequence of programming is:
1. Push simultaneous "SCAN" and "RDS" keys until on the screen will appear "1000" displayed.
2. Release keys. No more push on "SCAN" and "RDS" keys because otherwise number "1000" will be considered as first safe code attempt.
3. By the #1 key you will set up the first safe code digit.
4. By the #2 key you will set up the second safe code digit.
5. By the #3 key you will set up the third safe code digit.
6. By the #4 key you will set up the four-th safe code digit.
7. Then push again simultaneous "SCAN" and "RDS" keys for confirm this safe code. On the screen will be displayed "SAFE" notice. Release keys! For few seconds a radio frequence will be displayed. The radio is now ready for use!

Please rate my response. Thanks!

you need to contact your local dealer, they can help you to reset the Radio.

The code can ONLY be entered by a PROPER scan tool. The radio thinks u're trying to steal it and therefore won't work. Dealers gotcha by the balls here.

Chris