08 toyota rav4 remote start factory fob

I'm trying to wire in a remote start that works off of 3 negative pulses from the door locks. I can get it to work by using the key in the door, and I can get it work with the door lock switch, but I can't find anywhere that the voltage drops when you use the factory key fob that is built into the key. I tried both the light blue wire in the driver kick and the pink in the driver kick, but neither has voltage change from the key fob. Anyone know where I can get this signal?

you could get the signal directly from the lock motor wire and change the polarity to negative via a relay and feed that to your remote start unit.

UPDATE: I appreciate the help guys. syl20rochon those are the wires I tested and neither go to ground when using the factory keyless entry remote, only when using the key in the door or using the lock button on the door. I did find that the smaller red wire on the same plug as pictured above connects to the lock motor and briefly goes to ground when any of the 3 methods are used to lock the doors. SO I found a solution. Thanks!