Audio System Symptom Troubleshooting - Audio unit power switch will not turn on (No information display and no sound)
  1. Measure the voltage between audio/navigation switch panel 24P connector terminal No. 17 and body ground.
Is there about 0.5 V?
YES -
Substitute a known-good audio/navigation switch panel and recheck. If the symptom/indication goes away, replace the original audio/navigation switch panel. If symptom/indication is still present, replace the audio unit. ■
NO -
Repair open in the wire between audio/navigation switch panel connector (24P) terminal No.17 and audio unit connector C (12P) terminal No. 5 or check for a short to power. If there is no short to power, substitute a known-good audio unit and retest. If the symptom goes away, replace the original audio unit.■