Yes I saw your post, I was planning on following your guide but then i realised that only the front doors have those actuators, the rear doors are controlled by the gm3 module.

I understand what your are saying, it's an over complicated system so maybe it is related to the front actuators.

This seems like a a rare failure. I think I will have to take the rear door cards off and start probing at wires. Problem is, it's an intermittent problem that just started last week and has gone now.

I'll let you guys know if I figure it out.