Remove or change the position of the components.
Some optionals receive radio signals, and if this happens, GPS reception may be affected.
Is there anything such as a film stuck to the window?
Reception may be affected by a screen such as a film.
5 Service check mode. (Is "80-40, 41" is displayed in the unit check mode of the navigation ECU?)
Troubleshoot for each diagnosis.
Replace the navigation antenna.
If the trouble still occurs, replace the navigation ECU.
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