GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Navigation System Schematics

DEFINITION: The navigation display is blank, distorted, or the colors are not correct.

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. Turn the ignition to ACC with the engine OFF.
  2. Turn ON the navigation radio and insert the map disc.
  3. Press the NAV 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 navigation map should be clear and have clear color.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Does the display show the current position of the vehicle, but the map is unclear or discolored?

Go to Step 4

Go to Step 5

4

  1. Press the Setup button to access the Setup screen.
  2. Adjust the Brightness and Screen Color option.

Does the screen appear clear and have clear color?

Go to Step 6

Go to Step 5

5

Replace the navigation radio. Refer to Radio Replacement in Entertainment.

Did you complete the replacement?

Go to Step 6

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6

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

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