Conditions for Running the DTC
WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
The test is performed when the radio switches from OFF to ON. The radio will continue to test for the fault once every 0.5 seconds.