Yeah, that part discription throws you if you do not know the system..that is why I always tell guys the sw with the pigtail attached..that way they do not go to the wrong sw.

So , basically , I think you had a bad connection at R15 and you may still be very slightly short of refrig, but not by much b/c fans are coming on after a while..
You now want to jumper the correct sw [ peel back sleeves at WHITE connectors and jumper right there ]
That verifies circuit for low fan and now you just have to contend with proper pressure of high side to activate the low fan..and as I said from the get-go, most low fan problems that PASS the jumper test are short on REFRIGERANT.. it is that simple....also, as SB points out in another recent thread, this short refrig/no low fan also attributes to higher than normal coolant temps b/c of the passive heat exchange between radiator/condenser brought on by no low fan..customer looks at you a little weird when you tell them their overheating car needs a little refrigerant, but that's what it needs, just to get the airflow of low fan back into the scheme of things..
Let us know....................