Inspection Procedure

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Check Setting (The Volume Of The Navigation Sound)
1. Check the settings
  1. Set the volume MAX at the voice sound settings on the menu.
  Standard: Vocalize "This system will guide you in the volume"
NOTE:
- In the following cases, no voice sound guidance is made even if the system is normal.
- When the destination is not set.
- When not running on the rout (the remaining distance at the left bottom on the present point is not displayed)
- When "other modes guidance" is not set (voice sound guidance is made only on the map screen)
1. OK: Normal (Recheck The Operation)
2. NG: Go To Next Step
Inspect Navigation ECU (AUO+/-, GND)
1. Check signal waveform.
  1. Using an oscilloscope, check signal waveform between terminals AUO+, AUO- and GND of navigation ECU.
    
    Fig 1: Inspecting Navigation ECU Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Standard:
  
  Fig 2: Signal Waveform Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check And Replace Navigation ECU
2. OK: Repair Or Replace Harness Or Connector
Inspect Front No. 1 Speaker Assembly
1. Check continuity.
  1. Check that the continuity exists between terminals of front No. 1 speaker.
  Standard: 2 - 8 ohms
1. NG: Replace Front No. 1 Speaker Assembly
2. OK: Repair Or Replace Harness Or Connector