I could not find rear park assist, dealer install, available on any XC60 2010-2015.5
It looks like factory install only when the car was new or an upgrade package.
Front park assist install is available, if parts available.
Wiring for front/rear park assist below.
Do you have front park assist. Do you have 4/86 PAM in the Right rear corner.
The car is not prewired for front or rear park assist.
I could not find rear park assist SW for new install.

 

The only thing I have on my build is "Rear park assist camera". The original rear bumper does not have the 4 park assistance sensors, but the potential used replacement does. I do not currently have the PAM module.

1) Is this useable without the park assist? Anything I need to disable, different pinout on the harness connector, for example? At least that would give me the fog lights and a useable bumper. Just making sure that even with no feature add that it won't confuse the car with the extra items, thus wondering if I need to unwire anything.

2) From what I understand, it's a bit more complicated, needs a PAM, likely no way to add the rear software - correct?

Interesting that the front might be able to be requested, although I currently don't have that either.

 

Not to hijack this discussion but, I really appreciate the wiring diagram. I have a dead parking sensor and I wonder if there is a way to test the sensors at the PAM to see which one has failed?

 

Look up under the bumper to see if a rodent has chewed thru the sensor wire(s).
It is not very common to have a faulty sensor unless it got hit/damaged, bumped out of place.
A better OBD reader should be able to read/display PAM codes.
Sensor codes are numbered 1-8.
One of the front corner sensors is #1 across to #4, rear #5 is behind #4 across to #8.