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Yes then see what that does? sorry didnt know it was working after the nav hack. thought it wasnt working since you did that...its still could be a wire "or" plug for the GPS antenna that came loose? i wish i could find something so we know what it looks like.
Do you can tell me where is GPS antenna and how it looks like?
The NAV antenna is located at the base of the windshield in the center. Did you recently tint your windows with really dark or reflective tint? If the only problem is no signal lock then I would trace the antenna wire. It should be a single coaxial type cable that plugs into the back of the NAV unit.