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Home >> Lexus >> 2002 >> GS 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 179 (LEXUS Navigation System) >> Circuit Inspection >> 22. No voice navigation. >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus GS 430 and 2004 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Set the volume to the max in the menu screen 
    1. OK: Normal (Voice navigation is not available. No destination is set, or the vehicle is running off the route.) 
    2. NG: Go to Next Step 
  2. Check wire harness (navigation ECU and driver side door speaker). 

    PREPARATION: 

    Disconnect the navigation ECU connector and driver side door speaker connector.

    CHECK: 

    1. Check continuity between terminal AUO+ of navigation ECU connector and terminal 1 of driver side door speaker.
    2. Check continuity between terminal AUO- of navigation ECU connector and terminal 2 of driver side door speaker.

    OK: 

    Continuity 

    1. NG: Replace or repair wire harness. 
    2. OK: Go to Next Step 
  3. Check the sound (Check if the radio sound can be heard from the driver side door speaker.). 
    1. OK: Replace the navigation ECU. 
    2. NG: Go to next step. 

    Replace the speaker. 

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