How To Check For Audio Display Condition

WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to the ACC (I) or ON (II) position.
Enter the anti-theft code.
Turn off the audio unit.
Push and hold the "1" and "DISC 6" buttons. While holding the buttons, push the "VOL push PWR" knob (A) to ON. Release the buttons and the self-diagnostic function will begin.

Fig 1: Identifying "1" & "Disc 6" Buttons
Courtesy of AMERICAN HONDA MOTOR CO., INC.
"DIAGNOSTIC" will appear on the audio unit to indicate you have entered the self-diagnostic mode.
By pressing a preset button while "DIAG" is displayed, the input will trigger the diagnostic mode that is assigned to that preset switch.
"3" button

Entire LCD lighting mode: Turns on the entire LCD to show the presence or absence of an LCD failure.

"4" button

Entire LCD light-out mode: Turns off the entire LCD to show the presence or absence of an LCD failure.

"1" button (2WD)

Active noise control system function check mode:

How to check the active noise control system in this check mode
- With the engine stopped and while in "DIAGNOSTIC" mode, turn the ANC ON to OFF by pressing the No. 1 button, a low-Frequency hum (50 Hz) should sound for about a minute.
  - If the hum does not sound, check for an open in the wire between the active noise control unit and the audio unit.
  - If the hum does not sound for a minute, check for an open in the wire between the active noise control unit and the microphone.
- Start the engine while the hum is sounding, the hum should stop. If the hum does not stop, check for an open in the wire (NEP line) between the active noise control the unit and PCM.
- Test drive at 55 mph (88 km/h) and enter the "DIAGNOSTIC" mode, turn the active noise control system OFF and back to ON (II), the active noise control system should activate.
NOTE: The active noise control system is cancelled when any of the doors is opened.

"DISP/MODE" button

DVD player unit region code display mode: Display region code for DVD player unit.
The self-diagnostic function will end when the audio unit is turned off, or the ignition switch is turned off.