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Home >> Lexus >> 2005 >> GS 430 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> LEXUS Navigation System - Diagnostics >> Circuit Inspection >> 20. Vehicle position is deviated from correct point badly. >> Inspection Procedure

Inspection Procedure

  1. Check the mark display. (At a place with a fine view, is GPS mark displayed or not?) 
    1. No: Go to step   7 . 
    2. Yes: Go to next step. 
  2. Does the trouble occur in the specific area or not? 
    1. YES: Normal (If the vehicle is positioned in the place where it is difficult to be identified, the current vehicle position may be incorrectly displayed.) 
    2. NO: Go to next step. 
  3. Check the setting (Color of the automatic calibration button on the calibration screen). 
    1. Green: Normal. (Drive the vehicle (10 km or more) until calibration is completed. 
    2. Blue: Go to next step. 
  4. Service check mode. (Is "58-43" displayed in the unit check mode of the navigation ECU?) 
    1. YES: Troubleshoot for each diagnosis. 
    2. NO: Go to next step. 
  5. Navigation check mode (vehicle signal check mode: SPD). 
    1. NG: Replace or repair speed sensor wire harness. 
    2. OK: Go to next step. 
  6. Is there anything such as a film stuck to the window or any metal object on the instrument panel? 
    1. YES: Reception may be affected by a screen such as a film. 
    2. NO: Go to next step. 
  7. Recurrence Test (Confirm the phenomenon) (Correct the current position and drive the vehicle for a while with the GPS mark displayed). 
    1. OK: Normal. 
    2. OK: Replace the navigation ECU. 
  8. Check if the harness is caught or sharply bent or not. 
    1. NG: Navigation antenna is surely connected. 
    2. OK: Go to next step. 
  9. Check optional components. (Does it become if the optionals such as the theft deterrent system is removed?) 
    1. YES: Remove or change the position of the components. 

      HINT:

      Some optionals receive radio signals, and if this happens, GPS reception may be affected.

    2. NO: Go to next step. 
  10. Is there anything such as a film stuck to the window? 
    1. YES: Reception may be affected by a screen such as a film. 
    2. NO: Go to next step. 
  11. Service check mode. (Is "80-40, 41" is displayed in the unit check mode of the navigation ECU?) 
    1. YES: Troubleshoot for each diagnosis. 
    2. OK: Replace the navigation antenna. 

      HINT:

      If the trouble still occurs, replace the navigation ECU.

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