Hmmm.... BCM connector 73b is the white one?pins 18 and 19 on plug b of the Bcm for the range control module but there are already pins in them!
Anyways, the pins 18, 19 are the CANbus and indeed they are already occupied in the BCM - just need to tap on the CANbus where ever it's most convenient.
I've tapped in to the CAN as the cables come out of the BCM (I have it as Orange/black = can high - terminal 19 & Orange/brown = can low - terminal 18).