Acura car stereo lock codes

err-3 means you have entered incorrect anti-theft radio code more that three times.If you do not have radio code you can most of the time find the code card tucked away in the owners manual pouch.(looks like a bussiness card)If you are unable to find card you would have to pull radio from dash and retrive stereo serial number,which is on bottom side of radio.once you have s/n you can take s/n to any acura dealership(has to be a dealer)and they can get radio code for that stereo through Honda Corp.once you have correct radio code you will need to first unplug radio,or disconnect battery to reset radio memory,then type in radio code.again if entered incorrectly 3x ,radio would need to be reset again too clear error codes.good luck!