Audio unit button does not work (without navigation)

NOTE:

Check the vehicle battery condition first (see 12 VOLT BATTERY TEST ).
Check the connectors for poor connections or loose terminals.
In order to troubleshoot the main power switch, go to AUDIO UNIT POWER SWITCH WILL NOT TURN ON TROUBLESHOOTING .

Go to the audio button, knob, and audio remote switch detection mode in the audio Self-Diagnostic Function (see HOW TO CHECK THE AUDIO SYSTEM CONDITION ). Operate all items in the appropriate switch list.
Switch list

1-6, EJECT, FM/AM, CD, AUX, TITLE, Music/Speaker, SCAN, RPT, RDM/A.SEL, VOL PUSH SELECT, SEEK, PLAY, RETURN, PWR

Are all the items in the appropriate switch list detected?

YES -Operation is normal.

NO -Substitute a known-good center panel (see step 9 ), and recheck. If the symptom/indication goes away, replace the original center panel (see step 9 ). If the symptom is still present, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).