Where is the trunk release located inside the 325I,1988. Trunk lock doesn't work on 1990 BMW 325i

Trunk key won't open the trunk. Called several locksmith
And they said couldn't help because they don't have access to BMW

Asked by for the 1990 BMW 325i
Works through the door lock switch, inhibit switch at the top rear of drivers door.
1 more answer , 3 more comments
This car doesn't have a interior trunk release. Its too old for that technology.
Look at the wiring diagram. Mitchell
Thanks! Any suggestions on how I might be able to open it?
Remove the back seat