Go here:
https://www.crossfireforum.org/forum...ollection.html

Download the service manual.
Go to the connector pinout pages in the wiring chapter.
Look for "Central Locking Pump" connector C1.

That will show you the pinout of the connector.

Rip the trim from the trunk.
Rig your meter up by sicking the positive probe in the connector with pin 13.
Set up your phone's camera for video record, place it in the trunk to see the meter face, and close the trunk lid.

The video will show you what the meter read when the lid was closed.