How to check for audio system condition

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

NOTE: The audio unit must be in the code enter screen before doing the self-diagnostic function.

Turn the ignition switch to the ACC (I) or ON (II) position.
Push and hold the "No. 1" and "No. 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 PWR Knob
Courtesy of AMERICAN HONDA MOTOR CO., INC.
By pressing a preset button, the input will trigger the diagnostic mode that is assigned to that preset switch.
"No. 3" button

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

"No. 4" button

Duty (for the Illumination dim) indication mode: Indicates the duty for the Illumination dim.

"No. 5" button

Vehicle speed pulse indication mode: Indicates the vehicle speed pulse.

"FM" button (Push and hold 5 sec.)

Reception level check mode: Indicates the reception level.
The self-diagnostic function ends when you turn the audio unit off, or turn the ignition switch off.
Display Specifications

Fig 2: LCD Lighting - Screen Display
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Speaker check mode
Turn off the audio unit.
Push and hold the "No. 1" and "No. 3" buttons. While holding the buttons, push the "VOL push PWR" knob to ON. Release the buttons and the speaker check mode will begin. A low-frequency hum should for about one. Change the test speaker by push the "SKIP" button. If you find a speaker(s) with no sound, check the speaker and harness connections. If the connections are good, replace the speaker and retest.
The self-diagnostic function will end when the audio unit is turned off, or the ignition switch is turned off.