A/C clutch not engaging

Where does the high pressure switch go on the ECM? What color of connector is it and what pin terminal?

Where does the AC Request go on the ECM? What color of connector is it and what pin terminal?

Thanks

But you said the diagram was generic. What Pin is the AC request?

But you said the diagram was generic. I want to test at the ECM by back probing the Pin. What Pin is the AC request?

I tested for voltage at the high pressure switch 2 weeks ago. I want to test the high pressure switch at the ECM. The high pressure switch is an input device. When the Freon pressure is below 375 psi the switch will be closed. Therefore the voltage can't be 12 volts when the switch is connected to ground. So if the high pressure circuit is working correctly and the pressure is below 375 psi the voltage at the ECM Pin (where the high pressure switch terminates) will be zero. Your diagram doesn't indicate the Pin number. Again what pin is the high pressure switch at the ECM?

I'm sorry, but I don't remember seeing an image like that. This is much clearer than the others.

Thank you

Can I get the rest of that image enlarged like that? Much easier to see on the Phone.

Thanks

Pin 11 High Pressure switch has power all the time.
Pin 17 AC request is grounded all the time. When the AC button light on or off Pin 17 is grounded, checked both ways 3 times each.
Pin 55 Low Pressure switch is grounded all the time. Unless I unplug the low pressure switch then it would have power.
Pin 43 never changed to a ground.

I think Pin 17 being grounded all the time is an issue. I wasn't sure if I could unplug the connector from the ECU and then check for ground on the ECM.

Question
If Pin 11, 17, and 55 are grounded is ECM supposed to ground Pin 43?

I live in Calgary, Alberta, Canada and the days are getting colder. Is there a minimum temperature that needs to be reached for the AC to operate? When it gets colder out the AC Button light just flashes 3 times when depressed.

Thanks

I did ground Pin 11 while back probing, but Pin 43 didn't change to ground.

Isn't Pin 11 ground by the high pressure switch during normal operation?

On the diagram you provided Pin 11 is the high pressure switch. It's not a power supply.

Pin 55 is the low pressures switch. Pin 55 has power when the low pressure switch is unplugged, but is grounded by the switch when plugged back in. Which I think is normal.