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Activation
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Description
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Use
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Recirculation Flap
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Processor's control of the transistors that reverse the polarity of the circuit.
Note:
The output is active for approx. 10 seconds.
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Checking control module output, electric circuit or actuator function. In case of active output, the recirculation flap should be run to its end position. Otherwise, use a test lamp to find the defective lead/component.
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Heat Exchange Valve
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Processor's control of transistor that grounds the circuit.
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Checking control module output, electric circuit and actuator function. In case of active output, the magnetic clutch should draw power. Otherwise, use a test lamp to find the defective lead/component.
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Air Distribution Motor
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Processor's control of the transistors that alternately reverses the poles in the circuit to respective winding. When the requested position has been reached, one of the windings is continuously supplied with current to lock the motor.
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Checking control module output, electric circuit and actuator function. In case of active output, the damper should assume the correct position providing that the calibration has been completed first. Otherwise, use a test lamp to find the defective lead/component.
Note:
The control module output is only active until the control module thinks that the correct position has been assumed. For longer activation of the output and operation between the end positions, the calibration function is recommended instead (approximately 30 seconds).
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Left Heater Flap Motor
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Processor's control of the transistors that alternately reverses the poles in the circuit to respective winding. When the requested position has been reached, one of the windings is continuously supplied with current to lock the motor.
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Checking control module output, electric circuit and actuator function. In case of active output, the damper should assume the correct position providing that the calibration has been completed first. Otherwise, use a test lamp to find the defective lead/component.
Note:
The control module output is only active until the control module thinks that the correct position has been assumed. For longer activation of the output and operation between the end positions, the calibration function is recommended instead (approximately 30 seconds).
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Display and Bulb Test
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Processor's control of the transistors that activate bulbs for buttons and display as well as the display LCD unit.
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Checking bulbs, display and control modules.
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Fan Control Voltage
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Processor's control of the analogue output for fan control.
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Checking control module output, electric circuit and actuator function. In case of active output, the fan control should increase the current to the fan. Otherwise, use a test lamp to find the defective lead/component.
Note:
When fault-tracing, it can be more valuable to check the control voltage than to activate it since it can be easily activated from the panel. Keep in mind that the fan current is limited before the engine has been started.
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New Ambient Temperature Value
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The outside temperature value used internally by the control module is set at approximately 43°C.
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During fault diagnosis of the A/C when the outside temperature is below 1˚C, this activation must be used for the ACC to request A/C engagement. This applies even if the car is parked in a warm building.
In order for the ACC to allow the outside temperature value to increase, the vehicle speed must exceed 10 km/h. Activation should be done after the car has been parked in a building where the temperature is above 1 ˚C.
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