System Overview, OnStar

System Overview, OnStar

From model year 2001, certain markets have the option of the OnStar telematic system.
All cars on these markets are provided with wiring harnesses for the OnStar system.
For repairs and fault diagnosis, see SI 369-2190.
- Wiring diagram OnStar Provision
- Wiring diagram OnStar Provision

System Overview







- Main unit, Audio System (353)
- SID (541)
- Amplifier (354)
- Speaker(266)
- Telephone connection (375)
- Steering wheel switches (633)

Main Components







Brief Description

General
A mobile phone connection with simultaneous power supply for telephone battery charging is standard in the car. The sound from the selected source is disconnected automatically during a telephone call and the telephone sound (line in) is connected instead. Telephone volume can be preset and adjusted during a call.
As an option, a mobile phone connection with a "handsfree" function is available. Handsfree means that a call can be taken without lifting the receiver.

When a telephone is connected "handsfree", the incoming telephone sound is transferred to the audio system. At the same time, the normal sound is switched off. The outgoing sound is picked up by a built-in microphone in the car.

The following units are used in the audio system:
- Main unit, Audio System
- SID
- Amplifier (Premium and Prestige only)
- Speakers
- Steering wheel controls
- Telephone connection

Main unit
The main unit for the telephone system is the main audio system main unit.

Display
The telephone system uses the SID to indicate that the telephone is active. Display information is sent on the bus from the audio system and read by SID.

Amplifier
The Premium and Prestige audio systems both have side speakers which relay incoming telephone sound during a call.

Speakers
The audio system has side and centre speakers in the dashboard as well as in the front and rear doors. The Prestige system includes a bass speaker in the parcel shelf as well. These can relay incoming telephone sound during a call.

Steering wheel controls
The volume for the incoming telephone sound can be adjusted easily and safely with the controls on the steering wheel.
The controls are connected to the SID which detects their positions and sends information via the bus to the main unit.