Acura 2015 MDX - Navigation Manual (Without Software Update) Ver. ST02 - Manual (Page 144)

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 Audio System  Audio System Theft Protection
Audio
Audio System Theft Protection
The audio system is disabled when it is disconnected from the power source, such as
when the battery is disconnected or goes dead. In certain conditions, the system may
display Enter code. If this occurs, reactivate the audio system.
1. Set the power mode to ON.
2. Turn on the audio system.
3. Press and hold the audio system power button for more than two seconds.
 The audio system is reactivated when the audio control unit establishes a
connection with the vehicle control unit. If the control unit fails to recognize
the audio unit, you must go to a dealer and have the audio unit checked.
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Reactivate the audio system