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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 button 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. Turn off the audio unit, then turn the ignition switch to LOCK (0).
  1. Check the No. 1 (10 A) and No. 14 (7.5 A) fuses in the under-dash fuse/relay box.
Are the fuses OK?
YES -
Go to Step 5 .
NO -
Replace the fuse(s), and recheck.■
  1. Remove the audio unit. Check that the audio unit connectors are properly connected.
    NOTE: Eject the CD before removing the audio unit to prevent damaging the CD player′s load mechanism.
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).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between body ground and audio unit connector A (24P) No. 14 and No. 24 terminals individually.
Is there battery voltage?
YES -
Go to Step 9 .
NO -
Repair open or short in the wire(s) between the No. 1 (10 A) and No. 14 (7.5 A) fuse in the under-dash fuse/relay box and the audio unit.■
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect audio unit connector A (24P).
  1. Turn the ignition switch to ON (II).

  1. Measure the voltage between audio unit connector A (24P) terminal No. 12 and body ground.
Is there less than 0.1 V?
YES -
Substitute a known-good audio unit, and recheck. If the symptom/indication goes away, replace the original audio unit.■
NO -
Repair open in the wire between the audio unit and body ground (G503).■