[ctuna]

You need to complete the loop.
I have never looked at block other than in pictures
Since it's a loop just add in and complete.
If your car is prewired the way everything on an before 09
is I would trace the cassette changer wiring from the
trunk and see what you can do with that slot if ends in a slot.
You could tape ends together to test the circuit I think.
Maybe use a cut down plastic straw for a guide.
Also there has to be power to the module for it to complete
the loop. And I don't know what you have to do to
bring activate the subscription. There could be coding that
needs to be done to the car also to add it in.