Audio System Symptom Troubleshooting - Audio unit power switch will not turn on (No information display and no sound)
Audio unit power switch will not turn on (No information display and no sound)
NOTE:
  • Check the vehicle battery condition first.
  • Check the connectors for poor connections or loose terminals.
  1. Turn the ignition switch to ON (II).
  1. Push the power switch on to see if audio unit turns on.
Does the audio unit display operate properly, and does the audio unit sound normal?
YES -
Intermittent failure, the system is OK at this time.■
NO -
Go to Step 3 .
  1. Push the power switch on, then turn the ignition switch to LOCK (0).
  1. Check the No. 15 (10 A) fuse in the under-hood fuse/relay box and the No. 18 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Are the fuses OK?
YES -
Go to Step 5 .
NO -
Replace the fuse, and recheck.■
  1. Remove the audio unit with navigation system , without navigation system. Check that the audio unit connectors are properly connected.
Are they connected properly?
YES -
Go to Step 6 .
NO -
Repair poor connections and reconnect the connectors, and recheck the function.■
  1. Disconnect audio unit connector A (24P).
    NOTE: Eject all the CDs before disconnecting the audio unit and CD changer to prevent damaging the CD player's load mechanism.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between the terminals No. 14 and No. 24 of audio unit connector A (24P) and body ground.
Is there battery voltage?
YES -
Go to Step 9 .
NO -
Repair open in the wire(s) between the No. 15 (10 A) fuse in the under-hood fuse/relay box, the No. 18 (7.5 A) fuse in the driver's under-dash fuse/relay box and the audio unit.■
  1. Reconnect audio unit connector A (24P).
  1. Measure the voltage between the audio unit connector A (24P) terminal No. 12 and body ground.
Is there less than 0.1 V?
YES -
NO -
  1. Disconnect audio/navigation switch panel 24P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between the audio/navigation switch panel 24P connector terminal No. 14 and body ground.
Is there about 5 V?
YES -
Go to Step 14 .
NO -
Repair open in the wire between the audio/navigation switch panel and body ground.■
  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.■