How to Obtain the Audio Unit Serial Number

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This procedure can only be done after the power has been disconnected and reconnected to the audio system, and the audio system displays CODE when the audio system is turned on.

Turn the ignition switch to ON (II).
Make sure the audio system is turned off.
Push and hold the preset No. 1 and No. 6 buttons.
While holding the buttons, push the VOL PUSH PWR knob to ON.
Release the buttons, and the self-diagnostic begins.
The front climate control unit display shows an 8 digit serial number.

Fig 1: Identifying Front Climate Control Unit Display
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Use all 8 numbers as the serial number when using the interactive Network (iN) to retrieve the 5 digit anti-theft code.
To end the self-diagnostic function, turn the audio system off, or turn the ignition switch to LOCK (0).