Visit the manufacturer's website. If you didn't find the stereo security code on the owner's booklet or glove box, the next step you want to take should be to check out the manufacturer's website for online radio codes. Enter your code at this point (when the 4 dashes are shown), then press the smart symbol button to confirm the code. The radio should be activated. Example - if your code is 4321 you would get the 4 dashes to show and then press the "1" button x4 four times, the "2" button x3 three times, the "3" button x2 twice times and the "4 Visit the Manufacturer's Website Car radios are coming with an integrated screen and a keypad to allow the driver to easily navigate through their menu and set up different settings. The menu can also be reset with a code, which is generally provided by the manufacturer. The display should show "SAFE" or "CODE" then revert to four dashes after 3 or 4 seconds at power on (if you haven't put a code in recently). Enter your code at this point (when the 4 dashes are shown), then press the smart symbol button to confirm the code. The radio should be activated. Easiest method: Contact your local dealer's service department for the code or to reset the car radio for you. Second method: Go to the automaker's website with your car's information and request the code. Third method: Rely on free or paid online resources and databases. This article explains the options for finding a car radio code. Smart - Video tutorial. Model: Smart Smart 453 - Years 2014-2022. Part: Car stereo. Operation: How to reset the radio of a Smart Fortwo. I recommend carrying out this operation with the battery disconnected, in order to avoid risks. Before we can begin, we will need to open the glove box. This is a short video explaining how to unlock the smart cars radio when it is in locked safe mode. the code I found in the manual did not work so I will be going to the local Mercedes Find your radio code card and enter the code into the stereo as follows.Repeatedly pressing one of the station buttons (1, 2, 3 or 4 circled below) changes one of the numbers in the code line on the display. The first digit is increased by continually pressing station button number 1. 1 Answer The reset code for a smart car radio Posted by Lois Fowleron Aug 09, 2017 Want Answer1 Clicking this will make more experts see the question and we will remind you when it gets answered. Comment Flag More Smart can obtain this code for you (price unknown) that, when entered into the stereo, will reset the security code back to 0000 allowing you to turn the stereo on, gain access to the menus and change the security code to something you'd remember. Don't forget it again as the reset code works once. Mvfjm.