Note. Check the vehicle battery condition first (see BATTERY TEST ). In order to troubleshoot the main power switch, go to AUDIO UNIT POWER SWITCH WILL NOT TURN ON .
- Go to the audio button, knob, and remote switch detection mode in the audio Self-Diagnostic Function (see HOW TO USE THE AUDIO SYSTEM SELF-DIAGNOSTIC FUNCTION ). Operate all items in the appropriate switch list. Switch list With navigation system: TITLE, XM, FM/AM, PWR/VOL, SOUND, CD, AUX, 1-6, CATEGORY, TUNE, SKIP, SCAN/A. SEL With premium audio system: 1-6, LOAD, EJECT, FM, AM, XM, CD/AUX, TITLE, CLOCK, SCAN, CATEGORY, PWR, SKIP, A.SEL, RETURN, ENTER, MENU Without premium audio system: 1-6, EJECT, FM, AM, CD, TUNE/SOUND/CD, AUX, TITLE, CLOCK, SCAN, FOLDER, RDT/RDM, A.SEL, SKIP, PWR/VOL Are all the items in the appropriate switch list detected? YES -Operation is normal. NO -Substitute a known-good audio switch panel; with navigation system (see WITH NAVIGATION SYSTEM ), without navigation system (see WITHOUT NAVIGATION SYSTEM ), and recheck. If the symptom/indication goes away, replace the original audio switch panel; with navigation system (see WITH NAVIGATION SYSTEM ), without navigation system (see WITHOUT NAVIGATION SYSTEM ). If the symptom is still present, replace the audio unit; with navigation system (see WITH NAVIGATION SYSTEM ), without navigation system (see WITHOUT NAVIGATION SYSTEM ).