Help locating coolant pressure (not temperature) sensor

I am looking at wiring diagram for 2008 mini cooper 1.6L, the DME is grounding the fan relay even though engine cold and a/c off, there is 2 inputs for the DME unit one from coolant temp sensor and the other from coolant pressure sensor, any one familiar with Mini coopers chime in and tell me where to find it? I looked alldata, google...but couldn't locate it.

You can do a pressure test on a cooling system I don't think I have ever come across a coolant pressure sensor I am not sure it has one the coolant is read from the ecm with a thermistor pressures of the coolant are dependant apon engine specs i.e. displacement application of the engine and other operating parameters

What is the dme and what input is causing it to keep fan ground side switched

chief eaglebear wrote: What is the dme and what input is causing it to keep fan ground side switched

It's BMWs version of ECU, PCM, etc.

Sent from my Moto E (4) Plus using Tapatalk

Found this, hope it applies:

"Coolant pressure sensor
The coolant pressure sensor is fitted in the pressure line between the condenser and the evaporator. Depending on the sensor signal, the
air-conditioning compressor is regulated by the IHKA control module in the event of excessive refrigerant pressure. The junction box supplies the
coolant pressure sensor with voltage. The data is evaluated in the junction box electronics. The prepared data is sent across the body CAN
(K-CAN) to the IHKA control module."

workshop-manuals.com/mini/cooper_(r56)/l...t_heating/page_9071/

Thank you guys for your input.
Rockp2, I guess the Coolant pressure sensor is just the refrigerant pressure sensor then, I thought it has to do with anti-freeze.
I am still working on this and I will keep you guys updated:
P173b = CAN coolant temp sensor invalid.
P112b = Engine coolant temp low.
Fan works continuously with ignition On or engine running regardless of coolant temperature, fan turns off when removing fuse F05 (5 amp).

Pinto, I'm not certain there is not a engine coolant pressure sensor. That info I found on the internet. I'd check the sensor described against the wire diagram pole71 provided

A

Ste, your wiring diagram confirms that Coolant pressure sensor is indeed the refrigerant pressure sensor ( B161 ).