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Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refers to the step number on the diagnostic table.

7. If the Cellular Telephone Voice Low Reference circuit is shorted to voltage the Vehicle Communication Interface Module has been damaged and requires replacement.

Fig 1: No (Or Noisy) OnStar Audio
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