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Home >> Chevrolet >> 2003 >> Astro Van Cargo, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1617 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Audio Malfunction >> Circuit/System Description
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Circuit/System Description

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

When an OnStar® keypress is made, a serial data message is sent to the audio system to mute all radio functions and output OnStar® originated audio. After the audio system is muted, the communication interface module (CIM) transmits signals to the audio system on the cellular telephone voice signal and cellular telephone voice low reference circuits.

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