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The ECU needs to see a change in voltage level to the Di for the AC request.

Ie 12 volts when off and then 0 volts when on. Di then needs to be set to suit this (pull up off on level low) 

Then you will have a Aux output to control the AC clutch.

Have a good read through the PC link tuning software help file. Plenty of wiring and set up information in there


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