Does anyone have a schematic for the wiring to the trunk solenoid?

Problem: Remote / in car trunk release doesnt work.

Notes: When I press the trunk release button on the remote, I hear a click from the keyless entry unit. The fuse for the unit is ok.

When I test the 3 wire connector to the trunk solenoid i get:

* black / blue stripe wire: +12v

* centre wire: Ground

* black / yellow wire: no reading.

I have checked this black yellow wire and it has no continuity with the other wires / nor voltage change etc. when the button is pressed. Is this wire the signal wire?

Thanks for any help!!!?