Schematic Reference: Navigation System Schematics

DEFINITION: When using the navigation system, the global positioning system (GPS) icon does not appear on the navigation radio.

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Move the vehicle to an open area outside of the building.
2. Turn ON the ignition. The Cadillac emblem screen appears on the navigation radio.
3. Press the MAP button on the radio.
4. When the navigation disclaimer screen appears, press the I AGREE button on the display.
5. 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 and Poor Connections in Wiring Systems

Go to Step 3

1. Remove the global positioning system (GPS) antenna from its location on the rear shelf.
2. Place the GPS antenna outside of the vehicle, connected to the navigation module, and positioned horizontally.
3. Turn ON the ignition and turn ON the navigation system.

Does the GPS icon appear on the navigation radio?

Go to Step 4

Go to Step 6

Inspect the rear window glass for tinting or any other alterations or obstructions.

Is the rear window glass OK?

Go to Step 6

Go to Step 5

Remove the rear window glass tinting or other alterations.

Did you complete the repair?

Go to Step 8

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Replace the GPS antenna. Refer to Global Positioning System (GPS) Antenna Replacement .

Did you complete the replacement?

Go to Step 8

Go to Step 7

Replace the navigation radio. Refer to Control Module References in Computer/Integrating Systems.

Did you complete the replacement?

Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3