Brief description
| Brief description |
| General |
The Saab Audio System is a complete sound system for the car, including radio reception and a number of other functions.
It is equipped with an electronic theft protection system that interacts with the car. The audio system is “married” to the car and linked only to that vehicle in which it was first installed. Whenever the audio system is switched on, the system checks that it is the right one.
The audio system is available in three models: Premium, Prestige and Popular.
Each system contains the following units:
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Main unit:
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Radio
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Cassette player (Premium and Prestige only)
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CD Player
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SID (display)
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Amplifier (Premium and Prestige only)
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Speakers
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Aerial system
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Steering wheel switches
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CD changer (option)
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| Main unit |
The main unit is central to the Saab Audio System and is located in the centre console. The radio, cassette player and CD player are integrated with the main unit. The main unit also contains the controls for the various functions of the audio system.
The main unit communicates with the various other units and systems via the car's bus and wiring harnesses.
| Radio |
The radio module in the audio system is an AM/FM receiver with PLL frequency synthesis for the precise tuning of stations. It is factory-programmed to the frequency bands (2 x 6 AM and 3 x 6 FM) used in the various markets. If there is a loss of power (e.g., the battery is removed), none of the preset stations will be lost.
The audio system fitted to cars for the EU market incorporates RDS radio based on the double tuner system, which improves the quality of RDS reception and RDS radio services.
| Cassette Player |
The cassette player is front-feed. The mechanical functions are fully microprocessor-controlled to reduce the load on the tape. Auto-reverse, track search and blank skip are included.
| CD Player |
The CD player is front-feed with display for the compact disc inserted. The disc drawer holds 1 disc (diam. 8 or 12 cm). Random play and scan functions are included.
| Display |
The audio system uses the SID to show the current settings for the selected source.
The main unit transmits the display information on the bus, from where SID reads it.
| Amplifier |
The Premium and Prestige audio systems both have an external amplifier. The amplifier in the Prestige system has a higher output power than that of the Premium.
The Premium has 7 output channels and the Prestige 9 output channels for speakers. The two extra channels in the Prestige system are outputs for the bass speaker in the parcel shelf.
The amplifier has a separate power supply. It is not connected to the bus.
| Speakers |
The Premium and Prestige audio systems have side and centre speakers in the dashboard, and speakers in the front and rear doors. The Prestige system has a bass speaker in the parcel shelf.
The Popular audio system has side speakers in the dashboard and speakers in the rear doors.
| Aerial system |
There are two different types of aerial system for radio reception:
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Aerial system 1 consists of an AM and an FM aerial with an aerial amplifier. System 1 is fitted to the car as standard in the EU and PA markets.
Aerial system 1 is also used for a make of radio different to that used by Saab in the Saab Audio System. |
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Aerial system 2 consists of an AM, an FM1 and an FM2 aerial with an aerial amplifier. System 2 is fitted as standard in cars for the US and JP markets.
Aerial system 2 can only be used for the main units of the Premium and Prestige systems. |
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The aerials are fitted to the rear window. The AM aerial forms a separate loop and the FM aerials are integrated with the heating element on the rear window. The rear window is the same for both aerial systems, which allows the option of upgrading from aerial system 1 to 2.
The aerial amplifier is powered from the main unit and the amplified aerial signal is supplied to the radio via a coaxial cable.
| CD changer |
The CD changer is available as an option and located in the luggage compartment. The magazine holds 6 discs.
The CD changer is connected to the bus, via which it communicates with the main unit. It is activated (powered) when it receives a “Wake-up” signal from the main unit via the bus. The sound signal (balanced line output) from the CD changer is sent to the amplifier and speakers via the main unit.
The car is prewired for the CD changer which means that all wiring to and from the CD changer is included in the vehicle's wiring harnesses.
| Steering wheel switches |
The steering wheel is fitted with special switches to enable the most important functions of the audio system to be operated simply and reliably.
The switches are connected to SID which reads their positions and sends information to the main unit via the bus.
| P bus and I bus |
The buses are divided into the Powertrain bus (P-bus) and the Instrument bus (I-bus). Both buses are connected to the main instrument unit (MIU). The buses are electrically isolated from each other.
The data transfer rate on the P bus is ten times faster than on the I bus.
All the information sent from one control module is accessible to all the other control modules on the bus. The MIU is responsible for ensuring that information available on one bus is also available on the other bus.
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