Check optional components Does it become normal if the optionals such as the theft deterrent system is removed

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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