Here's what Alldata says:
Switch on the radio, "CODE" will appear on the display. Using the buttons on the alpha-numeric keypad, enter the five digit code. Confirm by pressing the "OK" key.
If an incorrect code has been entered and confirmed, "CODE" will reappear on the display. The correct code must be entered once again. If an incorrect code is entered three times, "WAIT" will appear on the display and the radio will be locked out for about 10 minutes.
Are you sure you have the right code? If not, call Mercedes Factory Assistance (800)367-6372 and give them your VIN, they'll give you the right code.
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Thursday, June 5th, 2008 AT 3:33 PM