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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1419 (NAVIGATION SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESNO GLOBAL POSITIONING SYSTEM (GPS) RECEPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

No Global Positioning System (GPS) Reception

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION No Global Positioning System (GPS) Reception
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 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 GPS icon does not appear on the navigation radio.
1 Did you perform theDiagnostic System Check - Navigation System  ? - Go to Step 2  Go to Diagnostic System Check - Navigation System 
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 and front door glass for metallic 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 or front door 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?		 200Ω 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 Radio Replacement in Entertainment.
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 
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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