Removed the obd11 plug on the car and as suggested there was corrosion on the pins. I think this might be an issue if the aircon drain gets blocked and it overflows into the passenger foot well. This was the case in my car when I got it. Gave it a good clean before refit ( the obd11 plug, the air con was sorted long ago). Removed EAS ECU, checked plug ok , sprayed with switch cleaner than back again. Dug out old Toughbook laptop and it fired up 1st go. Connected serial cable to car and laptop. Started EAS Unlock, Initialised, cleared faults, read faults.... NONE. GOOD IDLE, Removed cable, started car, Compressor singing away
As a special treat I fitted new insulation mounts to the compressor.
For those who moan about the EAS, whilst I was messing with this issue I was still driving the car every day as usual, running the compressor via a jumper for 5 mins in the morning. Cost to fix, ZERO however I did elect to buy a new lead as I am sure mine is Suspect



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