No Global Positioning System (GPS) Reception

WARNING: This page is about a different car, the 2005 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

NO GLOBAL POSITIONING SYSTEM (GPS) RECEPTION

Step	Action	Yes	No
Schematic Reference: NAVIGATION SYSTEM SCHEMATICS DEFINITION: When using the navigation system, the Gobal Positioning System (GPS) icon does not appear on the navigation radio.
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to DIAGNOSTIC SYSTEM CHECK - VEHICLE in Vehicle DTC Information
2	Move the vehicle to an open area outside of the building. Turn ON the ignition. Press the MAP button on the radio. When the navigation disclaimer screen appears, press the I AGREE button on the display. The display should show the current position of the vehicle. The GPS icon should appear on the upper left corner of the screen, indicating that the navigation system has proper GPS reception. Does the system operate normally?	Go to TESTING FOR INTERMITTENT CONDITIONS & POOR CONNECTIONS in Wiring Systems	Go to Step 3
3	Inspect the windshield and front door window glass for tinting or any other alterations or obstructions. Is the window glass OK?	Go to Step 4	Go to Step 6
4	Remove the GPS antenna from its location on the under the dash pad. Turn ON the ignition and turn ON the navigation system. With the GPS antenna connected to the navigation radio, hold the antenna horizontally and slowly move its position, while observing the GPS icon on the radio. Does the GPS icon appear on the navigation radio?	Go to Step 5	Go to Step 7
5	Inspect the coaxial antenna cable and connections. Inspect for any other obstructions to GPS reception, including other window tinting etc. Did you correct the condition?	System OK	Go to Step 7
6	Remove the window glass tinting or other alterations. Did you complete the repair?	Go to Step 9	-
7	Replace the GPS antenna. Refer to ANTENNA REPLACEMENT - GLOBAL POSITIONING SYSTEM (GPS) . Did you complete the replacement?	Go to Step 9	Go to Step 8
8	Replace the navigation radio. Refer to CONTROL MODULE REFERENCES in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	Go to Step 9	-
9	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3