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Read values
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Unit
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Min
|
Max
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Description
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Use
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Left Mixed Air Temperature Sensor
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V/V
|
0
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5
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Voltage across NTC resistor.
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Checking wiring harness and control module inputs.
If short circuit, approx. 5 V shown.
If input grounded, approx. 0 V shown.
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Actual Left Mixed Air Temperature
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°C/°F
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0/32
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80/176
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Voltage across NTC resistor converted to temperature.
Note:
The value is greatly attenuated.
Important:
Min and max values.
|
The value should correspond with the sensor temperature. Because of its attenuation, the value is not suitable for detecting intermittent circuit malfunctions.
Important:
Min and max values.
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Right Mixed Air Temperature Sensor
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V/V
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0
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5
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Voltage across NTC resistor.
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Checking wiring harness and control module inputs.
If short circuit, approx. 5 V shown.
If input grounded, approx. 0 V shown.
|
Actual Right Mixed Air Temperature
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°C/°F
|
0/32
|
80/176
|
Voltage across NTC resistor converted to temperature.
Note:
The value is greatly attenuated.
Important:
Min and max values.
|
The value should correspond with the sensor temperature. Because of its attenuation, the value is not suitable for detecting intermittent circuit malfunctions.
Important:
Min and max values.
|
Sun Sensor Front Cell
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V/V
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0
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5
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The infrared light from the sun's rays are converted to a voltage in 5 sensor elements, all oriented differently.
The voltage from the 5 sensor elements are sent consecutively to the control module. The value shows the voltage of the cell in question.
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Checking sensor element, wiring harness and control module input.
If there is no sunlight, then shine a 60 W lamp on the solar sensor. The various cells should show approximately the same value when they are lit up. In the event of a short circuit, all the cells will show approximately 0 V.
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Sun Sensor Right Cell
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V/V
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0
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5
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The infrared light from the sun's rays are converted to a voltage in 5 sensor elements, all oriented differently.
The voltage from the 5 sensor elements are sent consecutively to the control module. The value shows the voltage of the cell in question.
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Checking sensor element, wiring harness and control module input.
If there is no sunlight, then shine a 60 W lamp on the solar sensor. The various cells should show approximately the same value when they are lit up. In the event of an open circuit, all the cells will show approximately 0 V.
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Sun Sensor Back Cell
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V/V
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0
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5
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The infrared light from the sun's rays are converted to a voltage in 5 sensor elements, all oriented differently.
The voltage from the 5 sensor elements are sent consecutively to the control module. The value shows the voltage of the cell in question.
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Checking sensor element, wiring harness and control module input.
If there is no sunlight, then shine a 60 W lamp on the solar sensor. The various cells should show approximately the same value when they are lit up. In the event of an open circuit, all the cells will show approximately 0 V.
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Sun Sensor Left Cell
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V/V
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0
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5
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The infrared light from the sun's rays are converted to a voltage in 5 sensor elements, all oriented differently.
The voltage from the 5 sensor elements are sent consecutively to the control module. The value shows the voltage of the cell in question.
|
Checking sensor element, wiring harness and control module input.
If there is no sunlight, then shine a 60 W lamp on the solar sensor. The various cells should show approximately the same value when they are lit up. In the event of an open circuit, all the cells will show approximately 0 V.
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Sun Sensor Top Cell
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V/V
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0
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5
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The infrared light from the sun's rays are converted to a voltage in 5 sensor elements, all oriented differently.
The voltage from the 5 sensor elements are sent consecutively to the control module. The value shows the voltage of the cell in question.
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Checking sensor element, wiring harness and control module input. If there is no sunlight, then shine a 60 W lamp on the solar sensor. The various cells should show approximately the same value when they are lit up. In the event of an open circuit, all the cells will show approximately 0 V.
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Sensor Ground
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V/V
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0
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5
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All the sensors are grounded through a resistor integrated in the control module.
The control module measures the voltage across the resistor. The value should be below 0.1 V.
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Checking wiring harness and sensor:
The value should be below 0.1 V. A higher value indicates a short to B+ in the wiring harness to one of the sensors.
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Coolant Temperature (Bus from Trionic)
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°C/°F
|
-40/
-40
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150/302
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Coolant temperature from TRIONIC.
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Training:
Shows functioning of bus communication.
Unplug the connector to the temperature sensor and read the value. Read the value in TRIONIC as well and compare the two. DICE disengages the A/C in the event of a defective sensor or if the temperature is too high.
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Vehicle Speed (Bus from MIU)
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km/h (mph)
|
0
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255
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Vehicle speed from MIU. The left rear wheel speed sensor delivers an alternating current, the frequency of which varies with the speed, to the ABS. The ABS sends frequency modulated ground pulses to the MIU.
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Training:
Shows functioning of bus communication.
For diagnosing malfunctions, it is sufficient to see that the speedometer is working. If it is, then the value is consequently on the bus and therefore also in the ACC. The ABS sets a diagnostic trouble code in the event of a defective wheel speed sensor.
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Indoor Temperature Sensor
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V/V
|
0
|
5
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Voltage across NTC resistor.
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Checking wiring harness and control module inputs
If short circuit, approx. 5 V shown.
If input grounded, approx. 0 V shown.
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Indoor Temperature
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°C/°F
|
10/50
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40/104
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Voltage across NTC resistor converted to temperature.
Note:
The value is greatly attenuated.
Important:
Min and max values.
|
The value should correspond with the sensor temperature. Because of its attenuation, the value is not suitable for detecting intermittent circuit malfunctions.
Important:
Min and max values.
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Fan Control Voltage
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V/V
|
0
|
5.0
|
Voltage to fan control unit.
Note:
This voltage is the actual pin voltage because it is read back by the control module.
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Checking lead and control module output. The value should increase when a higher fan speed is selected.
Also compare to fan symbol on display.
Note:
The value is no help in the event of a malfunction in the fan motor circuit or fan control unit.
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Air Distribution Flap Position
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%/%
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0
|
100
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Calculated position of the flap. The value is determined by the number of pulses from the calibrated end position sent by the control module to the stepping motor. 0% is panel, 25% is panel/floor, 50% is floor, 70% is floor/defrost and 100% is defrost.
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Indicates the position in which the control module believes the flap to be. If this does not correspond with the actual position, despite calibrating, then this indicates that the flap is jammed or has loosened from its drive or that the motor is defective.
Note:
It is normal that extreme values are shown during calibration, often several hundred percent.
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Left Heater Flap Position
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%/%
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0
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100
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The calculated flap position. The value is determined by the number of pulses from the calibrated end position that has been sent to the stepping motor. 0% is max. cold.
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Indicates the position in which the control module believes the flap to be. If this does not correspond with the actual position, despite calibrating, then this indicates that the flap is jammed or has loosened from its drive or that the motor is defective.
Note:
It is normal that extreme values are shown during calibration, often several hundred percent.
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Right Heater Flap Position
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%/%
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0
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100
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The calculated flap position. The value is determined by the number of pulses from the calibrated end position that has been sent to the stepping motor. 0% is max. cold.
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Indicates the position in which the control module believes the flap to be. If this does not correspond with the actual position, despite calibrating, then this indicates that the flap is jammed or has loosened from its drive or that the motor is defective.
Note:
It is normal that extreme values are shown during calibration, often several hundred percent.
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Rear Heated Window (Bus from DICE)
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ON/OFF
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0
|
1
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ON is shown when DICE has grounded the output of the rear widow heating relay.
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The rear window heating symbol is shown next to ON. In the event of a fault in the function of the electrically heated rear window, see fault diagnosis in DICE.
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Outdoor Temperature (Bus from SID)
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°C/°F
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-40/-40
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40/104
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Outside temperature from SID.
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When above 5°C, ACC requests engagement of A/C if the engine has started and ECON is not lit on the display. In the event of defective function, see fault diagnosis of SID.
Note:
The value is greatly attenuated and filtered in the ACC unit and can therefore differ from the value on the SID display. The vehicle speed must exceed 30 km/h for the value to be allowed to increase.
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A/C Out
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ON
/
OFF
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0
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1
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ON is displayed when ACC requests A/C. The value is used by DICE.
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If the outside temperature is above 5°C, the engine has started and ECON is not lit on the display, then the value should be ON. If the compressor clutch does not engage, then activate it in TRIONIC and check the inhibitor conditions in DICE.
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A/C Compressor (Bus from Trionic)
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ON
/
OFF
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0
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1
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ON is displayed when TRIONIC activates the A/C relay.
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If ACC requests A/C and TRIONIC does not activate the relay, then DICE has inhibited it from being engaged.
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Recirc Flap Position
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FRESH AIR
/
RECIRC
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0
|
1
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Calculated position of flap. The value is determined by the polarity of the motor when it was last operated by the control module.
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Indicates the position in which the control module believes the flap to be. If this does not correspond with the actual position, then this indicates that the flap is jammed or has loosened from its drive or that the motor is defective.
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Heat Exchange Valve
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ON
/
OFF
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0
|
1
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ON is displayed when the control module grounds the output, whereby the solenoid opens and creates a vacuum on the shut-off valve, which in turn stops the flow of coolant.
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The control module closes the shut-off valve if the requested mixed-air temperature is the lowest possible for both zones. When ON, the coolant should stop circulating.
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Circulation Pump
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ON/OFF
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0
|
1
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Certain engine variants are fitted with a circulation pump for the heat exchanger. ON is displayed when the control module grounds the output and starts the pump.
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The control module grounds the output at low engine speeds and low temperatures. The pump should then operated.
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Button Pushed
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YES
/
NO
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0
|
1
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A button on the ACC unit panel is depressed.
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In the event of a suspected push-button fault, the control module can be checked to see if it has detected a depressed pushbutton.
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Parking Heater
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ON
/
OFF
|
0
|
1
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ON is displayed when the parking heater supplies B+ to pin 3 on the control module.
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Checking wiring harness and control module input: ON should be displayed when B+ is supplied to pin 3 on the control module.
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Requested Temperature Left
|
°C/°F
|
15
(0=
LO)
|
27
(85=
HI)
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Left side:
Shows the temperature selected on the panel and is displayed for the left side.
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Training:
Shows the most important default value for temperature control.
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Requested Headroom Temperature Left
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°C/°F
|
10/50
|
40/104
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Left side:
Shows the temperature that the system has requested at head height for the front seat. The value normally differs slightly from that displayed. The difference is a correction with reference to the outside temperature so that the temperature is perceived to be correct.
|
Training:
Shows the set-point value for temperature control that the system always strives to hold.
Important:
Min and max values.
|
Actual Headroom Temperature Left
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°C/°F
|
10/50
|
40/104
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Left side:
Shows the temperature at head height for the front seat. The value is calculated using the following default values:
cabin temperature, outside temperature, time since engine last ran, time since last start, mixed-air temperature, fan speed and solar irradiance.
|
Training:
Shows the value for temperature control.
Important:
Min and max values.
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Headroom Temperature Left: Deviation from Requested
|
°C/°F
|
-15/-27
|
15/27
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Left side:
Shows the difference between current temperature at head height and the temperature at head height requested by the system.
Important:
Min and max values.
|
Training:
Shows the difference between the value and the set-point value. The value is the so called control error and is used to determine if the mixed-air temperature must be increased or decreased. A positive value indicates that it is warmer than requested.
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Requested Mixed Air Temperature Left
|
°C/°F
|
0/32
|
80/176
|
Left side:
Shows the requested mixed-air temperature required by the system to correct the variation between actual value and set-point value for temperature at head height for the front seat.
Important:
Min and max values.
|
Training:
Shows the set-point value. This mixed-air temperature is required so that the temperature control error at head height will be zero.
Important:
Min and max values.
|
Actual Left Mixed Air Temperature
|
°C/°F
|
0/32
|
80/176
|
Voltage across NTC resistor converted to temperature.
Note:
The value is greatly attenuated.
Important:
Min and max values.
|
The value should correspond with the sensor temperature. Due to its attenuation, the value is not suitable for detecting intermittent circuit faults.
Important:
Min and max values.
|
Mixed Air Temperature Left: Deviation from Requested
|
°C/°F
|
-40/-72
|
40/72
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Left side:
Show the difference between current mixed-air temperature and the mixed-air temperature requested by the system.
Important:
Min and max speeds.
|
Training:
Shows the difference between actual value and set-point value. A positive value indicates that the mixed-air temperature is higher than requested.
Important:
Min and max values.
|
Requested Temperature Right
|
°C/°F
|
15
(0=
LO)
|
27
(85=
HI)
|
Right side:
Shows the temperature selected on the panel and is displayed for the right-hand side.
|
Training:
Shows the most important default value for temperature control.
|
Requested Headroom Temperature Right
|
°C/°F
|
10/50
|
40/104
|
Right side:
Shows the temperature that the system has requested at head height for the front seat. The value normally differs slightly from that displayed. The difference is a correction with reference to the outside temperature so that the temperature is perceived to be correct.
|
Training:
Shows the set-point value for temperature control that the system always strives to hold.
Important:
Min and max values.
|
Actual Headroom Temperature Right
|
°C/°F
|
10/50
|
40/104
|
Right side:
Shows the temperature at head height for the front seat. The value is calculated using the following default values:
cabin temperature, outside temperature, time since engine last ran, time since last start, mixed-air temperature, fan speed and solar irradiance.
|
Training:
Shows the value for temperature control.
Important:
Min and max values.
|
Headroom Temperature Right: Deviation from Requested
|
°C/°F
|
-15/-27
|
15/27
|
Right side:
Shows the difference between current temperature at head height and the temperature at head height requested by the system.
Important:
Min and max values.
|
Training:
Shows the difference between the value and the set-point value. The value is the so called control error and is used to determine if the mixed-air temperature must be increased or decreased. A positive value indicates that it is warmer than requested.
|
Requested Mixed Air Temperature Right
|
°C/°F
|
0/32
|
80/176
|
Right side:
Shows the requested mixed-air temperature required by the system to correct the variation between actual value and set-point value for temperature at head height for the front seat.
Important:
Min and max values.
|
Training:
Shows the set-point value. This mixed-air temperature is required so that the temperature control error at head height will be zero.
Important:
Min and max values.
|
Actual Right Mixed Air Temperature
|
°C/°F
|
0/32
|
80/176
|
Voltage across NTC resistor converted to temperature.
Note:
The value is greatly attenuated.
Important:
Min and max values.
|
The value should correspond with the sensor temperature. Due to its attenuation, the value is not suitable for detecting intermittent circuit faults.
Important:
Min and max values.
|
Mixed Air Temperature Left: Deviation from Requested
|
°C/°F
|
-40/-72
|
40/72
|
Right side:
Show the difference between current mixed-air temperature and the mixed-air temperature requested by the system.
Important:
Min and max values.
|
Training:
Shows the difference between actual value and set-point value. A positive value indicates that the mixed-air temperature is higher than requested and the mixed-air flap must allow in more cold air.
Important:
Min and max values.
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