Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Verify the OnStar® voice recognition is operating normally.
- If the OnStar® voice recognition is inoperative, refer to Voice Recognition Inoperative .

If the OnStar® voice recognition operates normally, test the audio mic in circuits for an open, short to ground or a short to power. If all circuits test normal replace the radio.