9-3 (9440) V6-2.8L Turbo (2008)
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Global Positioning System Module: Description and Operation
OnStar Control Module (673)
Location
OnStar Control Module (673)
Main task
The unit contains a mobile phone and a GPS receiver. It is connected to the radio, microphone, control panel, GPS/mobile phone antenna and data link
connector via the car's wiring harness. The unit is equipped with one 12-pin and two 16-pin connectors as well as an antenna connection.
The unit's main tasks in the system are the following:
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Voice and data communication via the mobile phone network.
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Receive data signals from GPS and calculate the car's position, which is transferred over the mobile hone network to the OnStar Call Center via
data communication.
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Send bus messages to activate the car horn and hazard warning lights.
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Receive bus messages if the airbag has been deployed in order to automatically call for assistance.
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Reproduce phone calls via the audio system speakers.
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Disconnect the sound of the audio system during a phone call. This is done by a mute signal being sent from the OnStar unit to the audio unit,
which then disconnects the normal sound in the connected speakers and the signal to any external amplifier.
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Diagnostics communication.
Power supply, ground and bus communication
