Courtesy / Puddle Light Wiring Help

[KyTacoma16]

Anyone know where and what color the wire is that sends the signal to the interior dome lights to come on when you lock/unlock or open your doors?

I'm trying to wire a relay to that wire for the signal to switch the relay to turn on under carriage lights (courtesy/puddle lights)

I have tried splicing so many wires and can't find the signal one.

Thanks in advance.