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.

Check the mark display. (At a place with a fine view, is GPS mark displayed or not?
1. Yes: Normal.
2. No: Go to Next Step
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
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 normal if the optional such as the theft deterrent system is removed?)
1. Yes: Remove or change the position of the components.
2. No: Go to Next Step
HINT:

Some optional receive radio signals, and if this happens, GPS reception may be affected.
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: Go to next step.
Replace the navigation antenna.

HINT:

If the trouble still occurs, replace the navigation ECU.