Circuit/System Verification

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Perform this diagnostic if the OnStar® Call Center operator can clearly be heard but the operator is unable to hear the caller.

Ignition ON, press the OnStar® Call button. Verify that your voice cannot be heard clearly by the OnStar® Call Center.

If your voice can be heard clearly, go to Testing for Intermittent Conditions and Poor Connections .