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Brief description

Brief description

General

A mobile telephone connection with simultaneous power supply for charging the telephone battery is standard in the car. The sound from the selected source is disconnected automatically during a telephone call and the telephone sound (line in) connected instead. The volume of the telephone can be preset as well as adjusted during the call.

As an option, a mobile phone connection with “handsfree” function is available. Handsfree means that a call can be taken without lifting the receiver.

When a phone 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 via a built-in microphone in the car.

The following units are used in the audio system:


• Main unit, Audio System

• SID (display)

• External amplifier (only AS3)

• Loudspeakers

• Steering wheel controls

• Telephone connection

• Antenna (Viggen)


Main Unit

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

Display

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

External amplifier (AS3)

Audio System 3 has an external amplifier with two output channels for loudspeakers in the front doors to relay the incoming telephone sound during a call.

Loudspeakers

The audio system has side loudspeakers in the dashboard and loudspeakers in the parcel shelf. Audio System 3 also includes bass loudspeakers in the front doors. These can relay incoming telephone sound during a call.

Steering wheel controls

The volume of the incoming telephone sound can be adjusted easily and safely with controls on the steering wheel.

The controls are connected to the SID unit. SID detects the positions of the controls and sends information via the bus to the main unit.

Antenna (Viggen)

The AM/FM antenna on the Viggen is also used for mobile telephones (GSM).

The antenna is fixed, and is located on the rear of the roof. A coaxial cable leads from the antenna to the main unit of the audio system.

P-bus and I-bus



Viggen has been introduced in the M99 range of models with a B235R engine and Trionic T7 engine management system. The bus system in the Viggen is therefore almost identical to that in the 9-5.

The bus system in diesel cars is unchanged from M98 1/2 with EDC 15 and the diesel pump connected to the bus.

Other petrol engine variants have the M2.10 or Trionic T5 engine management system as well as TCM on automatic cars. As earlier, these systems are not connected to the bus.

The two powertrain systems EDC and diesel pump are not connected to the I-bus, however. These systems require much faster communication to eliminate noticeable delays, e.g. when EDC requests a certain amount of fuel for injection.

They are therefore connected by a separate bus called the P-bus (Powertrain Bus). Communication on the P-bus is ten times faster than on the I-bus.

The P-bus is also connected to the MIU (Main Instrument Unit). The MIU ensures that the information that is available on one bus is also available on the other.