JDM s13 climate control issues

Hey lads

I'm currently trying to get the aircon working in my 180sx and I'm having all sorts of issues with getting the digital climate control unit to actually receive power..

I did the obvious things, changed fuses, checked relays, but currently, when I switch the car on, all it does is blow air at my feet but the actual unit doesn't seem to be getting power..

I've stuck a multimeter into the red wire pin on the plugs on the back of the unit and it's showing 0 volts, so I'm assuming something is holding it back..

I found those three plugs buried away in behind the unit, and none of them are plugged into anything.. Is anyone who's super knowledgeable about the system able to recognise those plugs and tell me what they are?? I can't find the sensor for the climate control thats supposed to be behind the dash either, so I'm assuming it's one of them, but at this stage I have no clue.

Thanks in advance!!