Bus messages, ACC
Bus messages, ACC |
For a detailed description of the car's bus system, see bus and diagnostics communication, detailed description .
ACC uses the following information
Bus message | Value/Unit | Transmitter | Description |
Parking heater active | On/Off | AHM | When the heater is activated via the ICM with the ignition off, the ACC will begin to adjust the car climate |
Auxiliary heater, coolant temperature | °C | AHM | The ACC selects the highest coolant temperature value from the ECM and AHM. Fan current and air distribution are adjusted as a function of the value |
Steering wheel side | Right/Left | BCM | ACC controls air distribution as a function of the driver's side temperature adjustment. The passenger cannot select Hi or Lo if the driver has not done so |
Key position, ignition | Lock Off On Start | CIM | ACC activated via bus |
Windscreen washer, lever active | On/Off | CIM | The message allows automatic recirculation selection for a 30s duration after washer activation. The purpose of the function is to reduce odour emanating from washer fluid additives |
VIN | Number 10-17 | CIM | DTC generated if ACC has a different VIN than the CIM. |
Car Speed | km/h | ECM | Speed value is used for the recirculation function and calculation model for the cabin temperature |
Coolant temperature | °C | ECM | The value is used for cold start identification. Air distribution and fan speed are set as a function of the temperature. |
Engine running | Not running, Idle speed, no idle | ECM | The information is used to reduce the electrical load when the engine is stationary |
Engine speed | rpm | ECM | The value is used as a safety backup if the "Engine running" information is incorrect |
Personal ACC settings | Auto Econ Off | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Electrically heated rear window, personal settings | Auto Manual | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Instrument lighting, display value | % | ICM | Display background lighting is controlled with this value |
Instrument lighting, Night panel active | On/Off | ICM | If Night Panel is active, the display is extinguished and the control lighting is dimmed |
Instrument illumination, rheostat value | % | ICM | The value controls control panel lighting |
Cabin temperature, personal settings | One-zone Two-zone | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Air distribution, personal settings | Defroster Panel Floor Defog Panel/Floor Tri-Level Panel/Floor/Defroster | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Personal fan speed settings | Higher Nominal Lower | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Recirculation, personal settings | On/Off | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Seat heating, personal settings | Auto/Manual | ICM | ACC selects the setting depending on the personal settings made via SID and SIDC |
Temperature unit | C/F | ICM | The value determines the display temperature unit |
Electrically heated rear window | On/Off | REC | The REC activates the electrically-heated rear window when ACC sends "On" |
Wheel speed, front left | rpm | TCS/ESP | The value is used as a safety backup if the "Car speed" information is incorrect |