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When you disconnect your battery and then reconnect itagain, it disables the radio. This is an anti-theft protection for your carradio. The enable your radio the activation code is in your vehicle owner's manual. Ifyou do not have this code you need to go to your vehicle manufacturer's servicecentre and get them to enter this code for you.
If it is the standard stereo unit fitted to the car from the factory then you need to call the car manufacturer to get the code.
If it is not then you need to call the manufacturer of the stereo to get the code.
Press [P1] followed by the tuning button to rotate the first digit Press [P1] followed by the tuning button to rotate the second digit Press [P1] followed by the tuning button to rotate the third digit Press [P1] followed by the tuning button to rotate the fourth digit
Finally if the correct code is shown on screen press the [P1] button to save the code.