Diagnostic Aids
WARNING: This page is about a different car, the 2018 Chevrolet Bolt EV. However, it is still accessible from the selected car via links, so may be relevant.
For the GPS antenna to receive a clear signal, it is necessary that the antenna has an unobstructed line of sight to at least 3 satellites, which means the reception is best when there is open sky above the vehicle for at least 180°.