SAAB WIS ONLINE

Brief description

Brief description

General

A connection for a mobile phone is a standard feature in the car. It provides simultaneous power supply for charging the telephone battery. When the phone is in use, the sound emitted by a pre-selected source is automatically disconnected and changed to the sound of the telephone (line-in). The volume of the sound 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 holding the receiver.

When a telephone is connected “handsfree”, the incoming telephone sound is fed into, and emitted by, the audio system. At the same time, the normal sound is disconnected. The outgoing telephone sound is emitted by a built-in microphone in the car.

The following unit in the audio system are used:


• Main unit, Audio System

• SID

• Amplifier (Premium and Prestige only)

• Speakers

• Steering wheel switches

• Telephone connection


Main unit

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

Display

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

Amplifier

The Premium and Prestige audio systems both have an external speaker to reproduce 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 reproduce incoming telephone sound during a call.

Steering wheel switches

The volume for the incoming telephone sound can be adjusted easily and safely with the steering wheel switches.

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


In the Saab 9-5, all control modules are connected to a bus, with the exception of ABS and SRS. In cars with Traction Control, the TC/ABS control module is connected to a bus.

The bus allows large quantities of data to be sent between the control modules on only two cables. The bus is divided into a Power train bus (P bus) and an Instrument bus (I bus).

Trionic, TCM and TC/ABS power train systems require fast data communication so that no noticeable delay occurs, e.g. for torque limitation when changing gears.

Trionic, TCM and TC/ABS are connected to the P bus, on which data transfer is ten times faster than on the I bus.

The P bus and I bus are connected to the MIU. The MIU is responsible for making information on one bus available to the other bus.

The diagnostic instrument is not connected directly to the bus but communicates via the DICE, one of the control modules connected to the I bus, and so has access to all control modules connected to the bus.

Vehicle speed data is important for many control modules. Since the ABS is not connected to the bus, the vehicle speed signal is sent on a separate lead from the ABS to the MIU. The MIU then sends the data over the busses. In cars with Traction Control, the TC/ABS sends vehicle speed data to the MIU via the P bus.