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If the correct anti-theft code has not been entered
after nine separate attempts and therefore after two
10-minute wait intervals- the radio will lock for 24
hours to prevent any further receding attempts. The
radio must be left on with the ignition key in position
1 during this period in order for it to reenter the
code mode.
Code cards should not be stored in the glove
compartment. During vehicle service at an
authorized Mercedes-Benz dealer, we recommend
that you leave one card with your service advisor.
Thus, if the battery is disconnected, the Service
Advisor can recode the radio before the car is
returned to you.
If you have difficulty reprogramming the radio or if
the reprogramming function fails to operate, please
contact your authorized Mercedes-Benz dealer.