The radio code is a safety feature equipped on the Honda Odyssey intended to prevent radio theft. Whenever the radio is removed or disconnected from the car battery the radio will require the input of a specific code in order to function. Resetting this code is a simple process but it does require that you first determine the appropriate code for your particular radio. The process for determining this will be easy or difficult depending on whether or not you still have access to the vehicle’s service manual.
Items you will need: Honda Odyssey service manual
Determine the radio code number. The radio code number is usually four or five digits long and can be found in your vehicle’s service manual. If you no longer have access to the service manual you will have to find the radio’s serial number.