when I bypassed the relay I didnot jump to the battery, I used jumped terminal 3 to 5 at te relay. This is a 13.06V supply. I took off the connector at the pressostat and shorted the two terminals and still no compressor. Is there another sensor that has to give the ok. I also took to my local volvo dismantlers (very reliable and knowledgable) they let me put in another working climate control but no luck. There is also a switch (or maybe sensor) right next to the window washhing fill tube, this is hooked up to both the fan and the ac system (has a three prong connector and is bolted to the ac line with a 14mm threaded fitting) they suggested this may have failed so they changed it out with a working one but again no compressor.

any othe ideas. Could it be the OBD?