2008 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK NAVIGATION SYSTEM SETTING 
    1. Enter the menu screen by pressing the "MENU" switch.
    2. Select "Volume".
      Fig 1: Diagnostic Tool Display - Volume
      G05293280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that "OFF" is not selected.
      Fig 2: Diagnostic Tool Display - OFF
      G05293281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      OFF is not selected. 

    NG: TURN VOICE GUIDANCE VOLUME UP TO 4 USING VOICE ADJUSTMENT SWITCHES 

    OK: Go to next step 

  2. CHECK NAVIGATION SETTING 
    1. Enter the menu screen by pressing the "MENU" switch.
    2. Select "Setup".
      Fig 3: Diagnostic Tool Display - SET UP
      G05293282Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that "Auto Voice Guidance" is not off.

      OK: 

      Auto voice guidance is not off. 

    4. Check that "Voice Guidance in All Modes" is on.
      Fig 4: Diagnostic Tool Display - Voice Guidance In All Modes
      G05293283Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      Voice guidance in all modes is on. 

    NG: TURN AUTO VOICE GUIDANCE "ON" 

    OK: Go to next step 

  3. CHECK MAP DISC 
    1. Check that the map disc is not deformed or cracked.
      Fig 5: Checking CD For Deformed Or Cracked
      G05293284Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      No deformations or cracks on map disc. 

    NG: REPLACE MAP DISC 

    OK: Go to next step 

  4. CHECK RADIO RECEIVER ASSEMBLY 
    1. Check that audio sound can be heard from the driver side speaker.

      OK: 

      Audio sound can be heard. 

    NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    OK: REPLACE NAVIGATION ECU 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.