Front parking sensors

[IMAY2023]

Basically, sensor pins 1 and 3 are common and pin 2 (middle pin) goes to the CEM.

SENSOR PIN 1 (common) goes to CEM PIN 15.

FRONT Total 8 wires for 6 sensors

SENSOR PIN 1 (common) goes to SENSOR PIN 44

SENSOR PIN 3 (common) goes to CEM PIN 45 SENSOR PIN 2 (starting from the left side sensor) goes to CEM PINs 37 to 42

I connected the negative to the floor of the car.
When you remove the carpet you have ground connections.
There are colleagues who have connected it directly to connections on the chassis.

New (used) forward bumper harness just arrived. It seems to be good although I will check it with multimeter before installation anyway, so I don't need to take the bumper off twice. Waiting now for the 4 PDC's to arrive and I will make my own harness from front bumper to CEM using 6x0,35mm2 wires (correct diameter? - got this off wiring diagram I found for SV90). Now I have 2 more questions. Are there female connectors in the old harness, the one that will remain in the engine compartment or I need to buy them and install them (photo of plug in bumper attached). I forget to check when I had the wheel off last time so kindly asking you guys
On the other end there must be a male connection on each wire to fit in CEM (photo from accessories manual attached as well). Where to get them? 
https://www.volvopartswebstore.com/produ...56648.html

Unless I'm not seeing something obvious or there is a way to firmly plug wires to CEM/plug? How did you did that part @Marcp?

BTW: that screenshot of CEM you attached, where's that from? Available for buplic?

If you do not have the fog lights, I suggest you wire them too. Your second hand harness should have the fog light connectors already! 
The connector is the same.   You will need 6x (9x if you want to wire the fog lights) 30656639 repair terminal for the car's harness connector.  
On the CEM side, you will need 30656698 x6  (x7 and 1x 30656637 if you want to wire the fog lights too.)  For some reason one of the fog light is using a larger pin.