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– Connect DSO measuring leads 1 & 2 -VAS 5051/8- to the
adapter leads.
– Measuring lead (signal wire) to terminal -2- of connector -B-
– Measuring lead (shielding, Ground) to terminal -1- of connec‐
tor -B-
– Set operating mode Test Instruments DSO (Digital Storage
Oscilloscope) on Vehicle diagnosis, testing and information
system -VAS5051B- .
– Then select the 5 V/Div = 0.5 ms/Div (5V DC and 0.5 millisec‐
onds per unit) setting.
– Start the engine.
– Set temperature preselect on Climatronic control module -
J255- to “Cold“ setting (maximum cooling performance)
– On Climatronic control module, switch activation of A/C Com‐
pressor Regulator Valve -N280- on and off by pressing the
“AC“ button (with indicator light when compressor is on).
Shown on screen of oscilloscope, depending on setting of Clima‐
tronic control module:
– In operating mode “OFF“ or “AC off“ (indicator light in “AC“
button does not come on), no square wave signal (the A/C
Compressor Regulator Valve is not activated).
– In operating mode “Auto“ and “AC on“ (indicator lights in but‐
tons come on) and temperature preselect at “Cold“ setting
(maximum cooling output), a square wave signal with an im‐
pulse width -A- between 75% and 100% (the control valve is
activated).
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
78 Rep. Gr.87 - Air Conditioning
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