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You can try the code 3051, that is the standard code that is usually set. 1234 is another common one. KCAR is also a common backdoor code. Please use one of the methods below based on your radios software.
The procedure to enter your security code differs on various models of Kenwood car stereos. Here are three of the more common procedures:Type 1* During the code request mode, while holding the DISP key depressed, press and hold the Volume UP or DOWN key for 3 seconds until the "..." display disappears.* Enter the security code using your Kenwood remote.Type 2* Press the "Auto" button and "Track up" on the face of radio at the same time until the four dash lines disappear.* Enter the security code using your Kenwood remote.Type 3: Model# ***** and DPX-4030* Press and hold the 1 then the 6 preset keys until the display shows the letter 'C'.* Enter the security code using your Kenwood remote.Entering Letters on your Kenwood Remote To enter a letter using your Kenwood remote, press a button once for the first letter, twice for the second letter, and three times for the third letter -- then press the Track Up or Next Track key to send the letter.To send the letter 'A', press the 2 key once and then press the Track Up key. To send the letter 'B', press the 2 key twice and then press the Track up key.Finally, when you are done entering all of the letters, press and hold the Track Up button for 3 seconds.The key sequence to enter the security code KCAR is:* 5* 5* Track Up* 2* 2* 2* Track Up* 2* Track Up* 7* 7* Track UpYour Kenwood should then enter tuner mode.
Give these methods a try. Let me know if your able to unlock it.