Active Noise Control (ANC) system check mode

WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to ON (II).
Press and hold the Preset 1 and Preset 6 buttons. While holding the buttons, push the VOL PUSH PWR knob (A) to ON.

Fig 1: Identifying VOL PUSH PWR Knob
Courtesy of AMERICAN HONDA MOTOR CO., INC.
By pressing the Preset 1 button, the input will trigger the ANC ON and OFF mode.
The self-diagnostic function ends when you turn the audio unit off, or turn the ignition switch to LOCK (0).