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 | From | 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. With ON the LED in the switch comes on.
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Front passenger seat, occupied
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YES/NO
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TWICE (ACM for cars with PPS)
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With YES and the automatic seat heating selected the heating pad will be on and the button LED will come on.
With NO, depending on outside temperature, the heating pad with be on automatically to heat the seat for a limited time. (Only AUTO control) |
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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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Language
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English, German, French, Spanish, Italian and Swedish
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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). With ON the indicator and background lighting are dimmed.
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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 control indicator and background lighting.
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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 dampened and filtered in the ACC unit and can therefore differ from the value shown on the main instrument unit display. |
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Engine Running
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ON/OFF
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ECM
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ECM sends Engine Running (ON/OFF). With OFF the fan current is limited to 0 A.
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Engine speed
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rpm
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ECM
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ECM sends engine speed (rpm). Fault handling. Compare engine speed message and Engine Running.
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Coolant temperature
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°C
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ECM
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ECM sends coolant temperature (°C). The value is used to calculate fan current and air distribution position for cold starts.
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Electric load
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ON/OFF
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EDC 16
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EDC 16 sends a request on electric load during particle combustion. In turn ACC sends electrically heated rear window ON, to DICE. See, electrically heated rear window in ACC sends the following information.
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A/C Compressor
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ON/OFF
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ECM
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ECM confirms that the A/C compressor is ON/OFF for regulating air recirculation in auto mode
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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 messages when extended user programming is programmed/deprogrammed. The value is used by SID and is shown on the main instrument unit display.
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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/EDC16
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ACC sends A/C (ON/ OFF). ON sends when AC/OFF is not selected and the outside temperature exceeds 0°C, and fan speed is lowest, one fan step. The value is used by DICE and EDC16. Note that there are more locking conditions in DICE and EDC16.
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 0°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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