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the smart/learn button on the rear of the motor unit near where all
those white wires go. Press and immediately release this and then
walk over to the keypad and key in any 4 digit code you like and
Whenever you disconnect a car battery, the radio needs to have the Security code installed. It is for theft protection. It is the code you programed into it when you bought the car. If you bought the car new, the code is usually a series of zero's, usually 3 or 4. If you bought the car used, you may have to contact the previous owner, & ask what they used as a radio code, or if they recoded it. If that is not possible, you'll have to take it to a dealer, to have the radio reprogrammed. If you have an owners manual, it will be described in there also, on how to do it all.