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Navigation, no external signal display?

Hello, I have a 2003 Lexus ES. The other day I had new tires put on the car and now my navigation has stopped working. I keep getting a reading stating. " no external signal detected" What can I do or look for?
Ken Finlay, September 2008
The manual says the system uses tyre turning data. Make sure all tyre pressures are correct.

D Brooks, December 2008
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