Circuit/System Verification

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, radio ON, set volume to comfortable level and press OnStar Center Call button.
Verify Connecting to OnStar message is heard clearly through the audio system.
- If OnStar message is not heard, go to Circuit/System Testing .
Tune radio to a known good station and verify that audio is heard clearly through all speaker channels.
- If no, refer to Speaker Malfunction .
If the radio is replaced, the new radio must have the setup procedure performed. Refer to Radio Setup .