Navigation System Symptom Troubleshooting - Voice guidance cannot be heard
  1. Check for continuity between navigation unit connector B (14P) terminal No. 12 and the audio unit connector B (20P) terminal No. 1.
Is there continuity?
YES -
Go to Step 11 .
NO -
There is an open in the circuit between the navigation unit and the 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 audio unit.■
NO -
Replace the navigation unit. ■