Per 2007 ECU RAV4 wiring diagram... Wiring plugs on Doc page 318 and 319
Magnetic clutch operation:
Lock Sensor which shows the two wires for the lock sensor in the clutch plug:
Toyota RAV4 Service Manual: Compressor solenoid circuit (2006/01- ) - Diagnostic trouble code chart (2006/01- ) - Air conditioning system (for manual air conditioning system) - Air conditioning
The solenoid function purpose: "In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier. Based on this signal, the compressor changes the degree of refrigerant compression" so basically it controls the actual flow of refrigerant either bypassing the pump or going through it. So if you wanted the AC full power youd wire 12v to keep it open whenever the AC clutch is going... on contrary youd wire it to cycle if you didn't need the AC pump to work as hard.
**The ideal thing to do would be to make a cycling circuit that would cycle the solenoid on and off according to the temp dial (so how far over to cold you put it) which would save gas if you only needed marginal ac to maintain temp...
IMPORTANT NOTE: From reading the compressor notes (page 10) it appears that the 2gr AC compressor does NOT have the internal overpressure valve (as described by Gouky on MR2forum), only the 2AZ. That being the case you will probably damage the 2gr compressor if left on at higher RPMs. I would either wire in some kind of RPM cutout relay on the solenoid line, or a cutout using the AC pressure sensor somehow (will figure out later).
A/C compressor Solenoid B23 :
brown 1- ground
grey 2 - 12v in
A/C pressure sensor A21: (not using)
A/C compressor magnetic clutch B47:
light green 1- Lock (clutch lock sensor, sends out volt signal to lock sensor?)
white /black 2- SG- (clutch lock sensor, receives switched signal from lock sensor?)
blue 3 - 12v in from mgt cntrl relay
SO That being the case I BELIEVE this would be the appropriate way to wire the 2gr AC compressor. (can anyone confirm?) :
Wire B47 magnetic clutch pin 1 to a thick switched 12v coming out of the/an AC relay
Magnetic clutch ground grounded through the mounting
Wire B23 compressor solenoid pin 1 to ground
Wire B23 compressor solenoid pin 2 to EITHER the same 12v from the AC relay, OR a homemade circuit that would cycle 12v based on temperature setting.