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.
In this video we recover the code from my Smart Roadsters Coupes stereo due to it being locked by a power disconnect. Normally the car is supplied with a 4 digit code, however if this is
Be smart and unlock your Smart Fortwo radio code smartly for free. The smart solution you have is here on our website. Solution for each Smart Fortwo owner that has a locked car radio that he can't use because the device asks for the original unlock key before playing music again.
Write down your VIN number and visit your nearest MB/smart dealeship. They can look up the 4 digit unlock code for you. If your owner's document package is complte, the code may also be in there.Bil
If you do find the code, use this process to reset the radio: Press the CD button, then use the four buttons below the radio, pressing the one on the far left first until the number on the readout area is the same as your first code number.
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
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smart car radio code reset