If your battery has ever died on your 2001 Honda Civic, you might know what a pain it is to reactivate your stereo without the proper knowledge. If this is your situation, this guide will make your life a lot easier.
Start your car.
Press and hold your "1" and "6" stereo preset buttons at the same time while turning your stereo on.
A code will be displayed as two sets of numbers, probably one beginning with "u" and the other with "l." Write down this number, minus the letters "u" and "l."
Take this 8-digit number to your local Honda dealer and ask them for the reactivation code.
Input this reactivation code into your Honda stereo.
