PRE-RELEASE
Bus messages, ACC
| Bus messages, ACC |
For a more in-depth description of the car's bus system, see System overview, bus and diagnostic communication, petrol and System overview, bus and diagnostic communication, diesel .
| ACC uses the following information: |
| Information | Value/Units | Off | Description | ||||||||||||||||||
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Electrically heated rear window, confirmation
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ON/OFF
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DICE
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DICE sends electrically heated rear window ON/OFF. When ON, the button symbol appears on the display.
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Front passenger seat, occupied
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YES/NO
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TWICE
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When YES, the control module will select the latest passenger temperature setting (the passenger must sit down before the speed exceeds 30 km/h for the first time).
If NO, the passenger side temperature setting will follow the driver's selection (ignition must have been turned off for more than 10 minutes). If any of the buttons on the passenger side should be pressed, the driver's selection is cancelled. |
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Vehicle speed, LH rear wheel
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km/h
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MIU
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MIU sends vehicle speed (km/h). The value is used to engage air recirculation at high outside temperatures and to filter the outside temperature from SID.
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Unit
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Celsius/Fahrenheit
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SID
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SID sends temperature unit (Celsius, Fahrenheit). The value is used to display selected temperature unit.
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Language
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English, German, French, Spanish
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SID
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SID sends the selected language. The value is used to write text messages on SID in the selected language.
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Rheostat value
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0-100%
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SID
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SID sends the rheostat value (%). The value is used to regulate the brightness of the button background lighting.
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Rheostat value, Night Panel
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1-100%
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SID
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SID sends the rheostat value for Night Panel 0-100%. The value is used to regulate the button background lighting when Night Panel is ON.
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Night Panel
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ON/OFF
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SID
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SID sends Night Panel (ON/OFF). When ON, the display goes out.
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Display lighting
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1-100%
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SID
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SID sends display lighting value (%). The value is used to regulate the display background lighting.
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Time Engine Off
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Minutes
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SID
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SID sends time engine off (minutes). The value is used to calculate current temperature at head height for the front seat passenger and driver. The following are also used as default values:
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Steering wheel location
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Right/Left
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TWICE
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TWICE sends the steering wheel location (right/left). The value is used to decide which zone is the driver's zone.
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Outside temperature (°C)
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°C
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SID
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SID sends the outside temperature (°C). The value is used to calculate the temperature at head level for the front seat passenger and driver. Defaults values also used are:
The value is attenuated and filtered in the ACC unit and can therefore differ from that shown on the SID display. |
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Engine Running
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ON/OFF
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TRIONIC
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TRIONIC sends Engine Has Started (ON/OFF). When OFF and engine speed below 600 rpm, the fan current is limited to 5 A.
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Engine speed
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rpm
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TRIONIC
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TRIONIC sends engine speed (rpm). When engine speed is below 600 rpm and Engine Has Started is OFF, the fan current is limited to 5 A.
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Coolant temperature
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°C
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TRIONIC
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TRIONIC sends coolant temperature (°C). The value is used to calculate fan current and air distribution position for cold starts.
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Diagnostics
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DICE/
diagnostics tool |
The diagnostics tool sends a diagnostic request via DICE (no unit). The value is used to answer the current request.
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| ACC sends the following information: |
| Information | Value/Units | User System | Description |
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Text message
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SID
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ACC sends Text message when extended user programming is activated/inactivated. The value is used by SID.
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Sound
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SID
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ACC sends Sound when extended user programming is activated/inactivated. The value is used by SID.
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A/C
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ON/OFF
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DICE
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ACC sends A/C (ON/OFF). ON is sent when ECON is not selected and the outside temperature exceeds 5°C and the fan speed is at least minimum speed. The value is used by DICE. Note that there are additional inhibitor conditions in DICE.
Note: As the outside temperature value is not allowed to rise unless the vehicle speed exceeds 30 km/h, A/C will not be requested if the outside temperature was below 5°C before the car was driven into the workshop (see activating: Outside temperature 20°C). |
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Electrically heated rear window
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ON/OFF
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DICE
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ACC sends Rear window heater (ON/OFF). ON is sent when the rear window heater is turned on. The value is used by DICE.
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Diagnostics
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DICE/diagnostics tool
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ACC answers to the diagnostics request from the diagnostics tool via DICE (no unit).
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