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Air conditioning not working

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Hi all

i have an issue with a 2010 model.  The air conditioning is not working.  I had the system regassed but the compressor clutch won’t engage.  I can remove the relay and put a jumper cable between pins 30 and 87 and the compressor clutch engages.  The fault I think is on the signal path to ecu.  I have 12v trigger when button is pressed ( green light comes on) and blower fan is switched on. Relay works on bench test 
I have jumped the pressure switch and this didn’t do anything.  From the Circuit diagram I have, I am looking at the air con amplifier or the pressure sensor (3 wire type That feeds the ecu direct). I can’t find either of these and suspect they are hidden behind the dash. Can anyone help or give me pointers to find these or what to do next 

thanks Roseyp

Edited by Roseyp
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