Circuit/System Verification
NOTE:
This procedure is not used in Brazil.
- Tune radio to a known good station and verify the audio is heard clearly through all speaker channels.
- If audio is not heard clearly, refer to Speaker Malfunction .
- Ignition ON, radio ON, press OnStar® Call Center button. Verify connecting to OnStar® message is heard clearly through the audio system.
- If OnStar® message is noisy or distorted, refer to Circuit/System Testing.