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No Global Positioning System (GPS) Reception

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Isuzu Ascender, 2005 GMC Envoy XUV, 2005 GMC Envoy XL, 2005 GMC Envoy, and 2005 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
No Global Positioning System (GPS) Reception

Step Action Value(s) Yes No
Schematic Reference: Navigation System Schematics 
DEFINITION: When using the navigation system, the global 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
  1. Move the vehicle to an open area outside of the building.
  2. Turn ON the ignition. The navigation screen appears on the navigation radio.
  3. The display should show the current position of the vehicle. The GPS icon should appear green 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 and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Leave the vehicle outside with the ignition ON or set to ACC for 30 minutes.
  2. Examine the navigation display for the GPS icon, indicating that the vehicle has GPS reception.
Does the system have GPS reception?		 - Go to Step 9  Go to Step 4 
4 Inspect the front window glass for tinting or any other alterations or obstructions.
Is the front window glass OK?		 - Go to Step 6  Go to Step 5 
5 Remove the front window glass tinting or other alterations.
Did you complete the repair?		 - Go to Step 9  -
6 Test the GPS antenna line for resistance between the center conductor and the outer shield.
Does the resistance measure near the specified value?		 200 Ω Go to Step 8  Go to Step 7 
7 Replace the GPS antenna. Refer to Antenna Replacement - Global Positioning System (GPS) (Module Assembly Radio Antenna) .
Did you complete the replacement?		 - Go to Step 9  Go to Step 7 
8 Replace the navigation radio. Refer to Control Module References in Computer/Integrating Systems.
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 
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