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| Connect the probe -VAS 5051/8- to the adapter leads. |
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| Test lead (signal wire) to contact -2- of connector -A- |
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| Test lead (screen, earth) to contact -1- of connector -A- |
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| On the vehicle diagnostic, testing and information system -VAS 5051 A-, set Measurement mode: DSO (Digital Storage Oscilloscope) and select the setting 5V/div DC, 0.5 ms/div (5 V DC and 0.5 milliseconds per unit) |
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| On the operating and display unit, Climatronic control unit -J255-, select „Lo“ temperature setting for driver's and front passenger's side (vehicles with automatically controlled air conditioner). |
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| Turn the rotary temperature setting control on the air conditioner controls (air conditioning system control unit -J301-) anti-clockwise as far as the „cold“ stop (vehicles with manually controlled air conditioner). |
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| On the operating and display unit, Climatronic control unit -J255-, press the buttons Auto and Off/On or Econ or AC to activate and deactivate actuation of the air conditioner compressor regulating valve -N280- (vehicles with automatically controlled air conditioner). |
Note Depending on the version of the operating and display unit, „Econ“ mode can be recognised for example from the indicator lamp in the button lighting on the model with ECON button and the indicator lamp in the button not lighting on the model with AC button. |
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| On the air conditioner controls (air conditioning system control unit -J301-), press the button AC to activate and deactivate actuation of the air conditioner compressor regulating valve -N280- (vehicles with manually controlled air conditioner). |
The display on the oscilloscope screen will be as follows depending on the setting on the operating and display unit, Climatronic control unit -J255-: |
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| In „OFF“ or „Econ“ mode („AC off“): No square-wave signal (regulating valve is not actuated) |
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