Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

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
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
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
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
Navigation check mode (vehicle signal check mode: SPD).
1. NG: Replace or repair speed sensor wire harness.
2. OK: Go to next step
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. NG: Replace the navigation ECU.
Check if the harness is caught or sharply bent or not.
1. NG: Navigation antenna is surely connected.
2. OK: Go to next step
Check optional components. (Does it become if the optional such as the theft deterrent system are removed?)
1. Yes: Remove or change the position of the components.
  HINT:
  
  Some optional receive radio signals, and if this happens, GPS reception may be affected.
2. NO: Go To Next Step
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
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. No: Replace the navigation antenna.
HINT:

If the trouble still occurs, replace the navigation ECU.