Navigation System Symptom Troubleshooting - Voice guidance cannot be heard

Voice guidance cannot be heard
NOTE:
  • Always check the connectors for poor connections or loose terminals.
  • Before troubleshooting, write down the customer's radio station presets.
  1. Press the display unit SET-UP button.
  1. Check the volume setting for the navigation system.
Is it set to OFF?
YES -
Set the volume to an audible level.■
NO -
Go to Step 3 .
  1. Check the radio operation.
Can you hear the radio?
YES -
Go to Step 4 .
NO -
Troubleshoot the audio system.■
Is ‘‘Radio'' icon red?
YES -
Troubleshoot the audio system.■
NO -
Go to Step 5 .
  1. Turn the ignition switch OFF.
  1. Disconnect the navigation unit connector B (14P) and the audio unit connector A (20P).
  1. Check for continuity between body ground and navigation unit connector B (14P) terminals No. 5, No. 12 individually.
Is there continuity?
YES -
Replace the affected shielded harness.■
NO -
Go to Step 8 .

  1. Check for continuity between navigation unit connector B (14P) terminal No. 5 and the audio unit connector A (20P) terminal No. 13.
Is there continuity?
YES -
Go to Step 9 .
NO -
There is an open in the circuit between the navigation unit and audio unit. Check for poor connections or loose terminals at the audio and navigation units. If a poor connection or loose terminal is found, replace the affected shielded harness.■

  1. Check for continuity between navigation unit connector B (14P) terminal No. 12 and the audio unit connector A (20P) terminal No. 12.
Is there continuity?
YES -
Go to Step 10 .
NO -
There is an open in the circuit between the navigation unit and audio unit. Check for poor connections or loose terminals at the audio and navigation units. If a poor connection or loose terminal is found, replace the affected shielded harness.■
  1. Substitute a known-good audio unit, and recheck.
Is the system OK?
YES -
Replace the original audio unit.■
NO -