Component Description: OnStar®: Notes

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

OnStar equipped (RPO UE1) vehicles use the radio amplifier and speaker system for voice communication from the OnStar operator to the vehicle. Voice communication from the vehicle to the OnStar operator is through the OnStar microphone and module, which is not a part of the radio system.

When OnStar begins operation, the radio volume is set to a preset level, autotone preset for OnStar becomes active and the fade control is adjusted to the full front speakers. The radio volume control can then be used to adjust the volume to a desired level.

The radio system and OnStar system are connected through the 12-way connector at the back of the radio. Left and right channel OnStar audio, mute control of radio functions by OnStar, and the audio signal ground are the circuits provided in the 12-way connector.

Disconnecting the 12-way connector from the radio will isolate the radio system from the OnStar system. Voice communication from the vehicle to the OnStar operator could be possible under this condition. However, the vehicle occupant will not be able to hear the OnStar operator.