2005 expedition crimestopper rs0 actuator

I'm putting an RS0 remote start on my 2005 Expedition with OEM keyless entry. The RS0 should be actuated by three - pulses from the driver door lock. I've seen quite a few wiring diagrams here and elsewhere on the web referencing the pink / YELLOW wire and a pink/black wire for this pulse. The pink / YELLOW is only attached to the door switch and does not have any signal when tested with the factory keyfob lock. There are numerous pink/black wires in the driver's kick panel and I have tested all of them and not found a - pulse when keyfob lock is pressed. I tested all wires at the VSM(BSM) gray connector and did not find any with a - pulse when hitting the lock button on the keyfob. I've also seen some references to the vehicl wiring diagram WITHOUT keyless entry saying it is a 5 wire door lock, but the system WITH keyless entry is not.

I can wire a relay to the pink/black wire at the VSM(BSM) that switches to ground, but if there is an existing - pulse wire I would prefer to use it. Also, confirmation of what type of door lock system is in the vehicle WITH factory keyless entry would be helpful.

Thanks