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I have a 2010 G37X and the A/C was working fine and suddenly stopped working. The climate control functions seem to all work properly, but the compressor doesn't kick on.
I checked the 10A fuse in the IDPM behind the battery and am now trying to find the Relay. I ordered some A/C manifold gauges to check the refrigerant pressures but until they come in I'd like to check the Relay next. Can someone tell me where I might find it?
As Surf**** said, the relay is in the IPDM/er:
Keep in mind the relay is NOT serviceable by itself. In the event the relay is bad, the whole IPDM has to be replaced.
Did you run the IPDM/er self-test? This will test the AC relay as well as the magnetic clutch on the compressor:
In the event the compressor clutch does NOT cycle, I would run a 12V jumper directly from the battery to the compressor as a final test. If the clutch engages, then likely the relay is shot. If the clutch does NOT engage then likely the compressor is shot.
I suggest you download a copy of the factory manual for your car- if you haven't already.
Having waded through them a bit, see the attached pics below for some ideas. it looks to me like your compressor relay must be in the IPDM. Fed by fuse #49, the relay output goes to pin 48 of the large connector on the right. The relay itself is not marked anywhere that I can find, but there are two on the top of the IPDM and one is marked as the "starter control relay", so makes me wonder if the left one is the one you're looking for.
Having said all that, make sure fuse 49 is passing current. Then I'd start at the compressor to see if power is getting to the clutch... If not, there is one other connector "E40 to F39 in the wire from the compressor to the IPDM. If you can find that connector, check there. No power? Then check pin 48 at the IPDM to see if power is getting through the relay.
Just to reiterate, the AC relay is integrated into to the IPDM. It is NOT removable/serviceable.
The IPDM/er self test should check the electrical side of the compressor. If the electrics are good then look into the refrigerant side of the equation.
