Brief description
| Brief description |
| General |
The purpose of the SID unit is partly to provide the driver with information and partly to control the horn, instrument and display lighting, and perform calculations for the SID unit trip computer. It has its own diagnostic function and diagnostic trouble codes are generated when faults occur.
The SID unit receives information from its own sensors and switches as well as from other systems. The SID unit sends out certain information on the bus.
The SID unit has the following sensors:
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Temperature sensor, outdoor
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Steering wheel controls
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Engine coolant level sensor
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Washer fluid level sensor
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Filament monitor, front lights
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Rheostat
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Interior light sensor
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Temperature sensor, outdoor
The temperature sensor sends information on the current outdoor temperature to the SID unit. The display shows the temperature in the interval -40 - +50 °C (-40 - +122 °F).Steering wheel controls
There are 7 control buttons on the steering wheel. One is used to activate the horn, the others to control the audio system in the car. The display in cars fitted with the Saab Audio System shows the station to which the radio is tuned. When a button is pressed, the SID reads a voltage level.On cars without an audio system, only the horn button is fitted.
Engine coolant level sensor
The sensor detects a low coolant level and informs the SID unit.FILL COOLANT FLUID is displayed.
Washer fluid level sensor
The sensor detects a low washer fluid level and informs the SID unit.WASHER FLUID LEVEL LOW is displayed
Filament monitor
The filament monitor tests the front headlamp function and passes the information to the SID unit.FRONT LIGHT FAILURE is displayed.
Rheostat
The SID unit uses the current rheostat setting to control the button and display lighting on the SID unit.The rheostat value is output to the bus for use in adjusting the control and instrument lighting.
interior light sensor
The light sensor is integral with the SID unit and used to measure the light intensity in the vehicle. The SID unit uses the current light reading and rheostat value to determine the intensity of the display lighting.The interior light reading is output to the bus for use in adjusting the light intensity of the indicator lamps on the main instrument unit.
The display lighting value is output to the bus to control the light intensity of the displays.
| Units and languages |
The SID unit's display of unit combinations and language can be selected according to the market. The following combinations are available:
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Unit combinations
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Language
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litres/100km + °C (24 hour)
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Swedish
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miles/gallon (US) + °F (12 hour)
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English
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miles/gallon (imp) + °F (12 hour)
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German
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miles/gallon (imp) + °C (12 hour)
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French
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Italian
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Spanish
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The selected units and language are output to the bus for use by other systems.
| Sound |
The SID unit has an integral speaker for acoustic signals for its own functions and the functions of other systems.
| Trip computer |
The trip computer in the SID unit is operated by the buttons under the display.
The computer is available in two versions, SID 1 and SID 2 with the functions shown in the table:
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Functions
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SID 1
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SID 2
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TEMP (outdoor temperature)
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X
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X
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DTE (distance on remaining fuel).
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X
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X
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FUEL (average fuel consumption)
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X
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X
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SPD (average speed)
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X
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X
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DIST (distance to destination)
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X
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ARRIV (arrival time)
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X
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ALARM (time alarm)
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X
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SPD W (speed warning)
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X
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| Time |
The SID unit contains a digital clock with the current time, date and month always visible when the SID display is on. the year is included but not displayed.
The clock is adjusted manually but can also be adjusted by RDS time, which the radio outputs to the bus. (Certain markets).
| CHECK messages |
The SID unit display can be used by all connected systems to show CHECK messages.
| Service message |
Service reminder showing when it is time for a service.
| Audio display |
The SID unit display is used to show the radio, cassette and CD settings on cars with the Saab audio system.
| Horn |
The SID unit activates the horn when information has been received from the steering wheel control.
| Night Panel |
The Night Panel function switches off the display and parts of the instrument lighting, and dims the button lighting.
The Night Panel information is output to the bus for use by other systems.
| Engine off time |
The SID unit calculates the length of time the engine has been switched off. This time information is output to the bus to be used for start settings for the ACC system among others.
| Important | ||
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The Service Manual does not cover the complete operation of the SID unit. More detailed information is given in the Owner's Manual. |
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| P-bus and I-bus |
The two power-train systems, EDC and the diesel pump, are however not connected to the I-bus. These systems require considerably faster communication so that no delays are noticeable, e.g. when EDC requests a certain fuel mass for injection.
Therefore, they are connected through a separate buss called the P-bus (Powertrain Bus). The P-bus has a data transfer rate ten times higher than that of 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.
| SID uses the following information |
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Information
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Unit
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Sensor system
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Description
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Position lights
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ON/OFF
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DICE
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The SID unit uses this information to calculate the rheostat value.
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Rear Fog Light Broken
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YES/NO
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DICE
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The SID unit uses this information for a CHECK message.
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LH direction indicators
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ON/OFF
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DICE
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The SID unit activates TICK-TACK for the direction indicator function.
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RH direction indicators
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ON/OFF
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DICE
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The SID unit activates TICK-TACK for the direction indicator function.
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Sound
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Sound information
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DICE
TWICE ACC Audio MIU PSM STC |
The SID unit activates the type of sound requested via the bus.
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LH Rear Light Broken
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YES/NO
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TWICE
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The SID unit uses this information for a CHECK message.
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RH Rear Light Broken
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YES/NO
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TWICE
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The SID unit uses this information for a CHECK message.
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Left Brake Light
Broken |
YES/NO
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TWICE
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The SID unit uses this information for a CHECK message.
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Right Brake Light
Broken |
YES/NO
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TWICE
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The SID unit uses this information for a CHECK message.
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High Level Brake Light
Broken |
YES/NO
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TWICE
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The SID unit uses this information for a CHECK message.
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Brake lights
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ON/OFF
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TWICE
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The SID unit informs the driver via CHECK messages.
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Test Brake Lights
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ON/OFF
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TWICE
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The SID unit tells the driver via the CHECK message to press the brake pedal. (Some markets only)
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Horn
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0 : 6 : 42 ms
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TWICE
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The SID unit uses the information from TWICE and activates the horn for the requested period of time measured in ms as confirmation of “TSL” locking (Theft Security Lock).
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Text Message
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Text Information
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TWICE
ACC Audio STC MIU |
Text information from TWICE on the anti-theft alarm function, ACC on the current programming, audio display, lower fuel level from MIU, soft top status from STC and warning for overheated oil in the gearbox.
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RDS Time
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Hours
Minutes Seconds |
Audio
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The SID unit uses the information in the time function (clock).
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RDS Date
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1-31
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Audio
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The SID unit uses the information in the time function (clock).
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RDS month
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January -
December |
Audio
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The SID unit uses the information in the time function (clock).
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Vehicle speed
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km/h
mph |
MIU
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The SID unit uses the information for calculations for the trip computer function.
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Tighten fuel filler cap
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ON/OFF
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MIU
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The SID unit uses the information for a CHECK message (certain markets). The information comes from Trionic via a lead and is output on the bus by MIU.
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Engine coolant temperature (petrol)
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-40 - 215°C
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MIU
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The SID unit uses the information to calculate DTE.
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Engine Started (petrol)
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ON/OFF
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MIU
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The SID unit uses the information to calculate “Engine Off Time”.
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Fuel Consumed
Since Start (petrol) |
0-65535 ml
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MIU
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The SID unit uses the information for calculations for the trip computer function.
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Fuel level
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Litres
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MIU
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The SID unit uses the information for calculations for the trip computer function.
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Odometer reading
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km, miles
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MIU
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The SID unit uses the information for calculations for the trip computer function.
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Fuel Consumed
Since Start (diesel) |
0-65535 ml
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EDC 15
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The SID unit uses the information for calculations for the trip computer function.
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Engine coolant temperature (diesel)
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-40 - 215°C
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EDC 15
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The SID unit uses the information to calculate DTE.
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Engine Started (diesel)
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ON/OFF
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EDC 15
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The SID unit uses the information for the auxiliary heater and to calculate the “Engine off time”.
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Diagnostics communication
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DICE
Diagnostic tool |
See 3:5 Bus and Diagnostics Communication
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| The SID sends out the following information |
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Information
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Unit
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User system
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Description
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Info Disp Lamp
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ON/OFF
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MIU
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The MIU lights the lamp on request from the SID.
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Unit
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Metric
Imperial (°F) Imperial (°C) US |
ACC
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The SID unit uses the information to display the correct units.
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Language
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Swedish
English German French Italian Spanish |
ACC
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The SID unit sends out information on the language selected.
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Steering wheel controls
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VOL -
VOL + SRC SEEK >> << SEEK NXT |
Audio
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The SID unit sends the information when a button on the steering wheel is pressed (activated).
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Rheostat level
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0-100%
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Audio
ACC DICE MIU |
The SID unit sends out information for regulating the instrument and control lighting.
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Rheostat Night Panel
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0-100%
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Audio
ACC DICE MIU |
Rheostat level less a fixed value. Used for button lighting.
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Night Panel
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ON/OFF
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Audio
ACC DICE MIU |
The Night Panel function is activated and deactivated.
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Display lighting
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0-100%
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ACC
MIU |
Lighting level for all displays. The highest rheostat or light sensor level.
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Light intensity in compartment
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Lux
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MIU
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Used by the MIU to regulate the intensity of the indicator lamps.
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Time engine switched off
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Minutes
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ACC
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ACC uses the value to calculate the settings when starting.
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Outdoor temperature
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°C
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ACC
TWICE DICE |
The SID unit sends out the information for use by other systems.
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Diagnostics communication
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-
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DICE
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See 3:5 Bus and Diagnostics Communication
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SID buttons
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Clear
Set Trip Down Trip Up Night Panel |
TWICE
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Button status on the SID unit.
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