Navigation System - Voice Guidance Inoperative or Degraded Quality

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Navigation System Schematics Connector End View Reference: Entertainment Connector End Views DEFINITION: The navigation voice guidance is inoperative, you can not hear voice commands, or the voice guidance volume is reduced or noisy.
1	Did you perform Diagnostic System Check - Navigation System?	Go to Step 2	Go to Diagnostic System Check - Navigation System
2	Can audio be heard from the left front speakers when a CD is played or the radio is on?	Go to Step 3	Go to Speakers Inoperative - One or More in Entertainment
3	Turn the ignition to ACC with the engine OFF. Turn on the navigation radio and insert the map disc. Press the NAV 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 navigation map should be clear and have clear color. Push the "MENU" button to display the menu. Select "Volume" from the menu. Adjust the volume. Navigation audio should be heard from the left front speaker as the audio level is adjusted. Does the system operate normally?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 4
4	Test the navigation audio circuit for an open, a short to ground, or a short to voltage. Refer to the following procedures in Wiring Systems: Testing for Continuity Testing for Short to Ground Testing for a Short to Voltage Did you find and correct the condition?	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	-
6	Operate the system to verify the repair. Did you correct the condition?	System OK	Go to Step 2