Key Fob not locking/unlocking - actuator or GM5?
So, I had this issue once with my dad's e39. The key fob would not lock/unlock the doors. It was a fairly easy repair. I did it awhile ago so I don't remember the specifics, but the repair was done in the trunk.
The same issue is coming up on our e46 and based on the searching I've done, it's not as straightforward. It looks like it can be a problem with the actuator or the GM5 module. Both look like fairly involved DIY's. Is there a test I can do to determine which part might be the issue? I'm hoping to avoid an unnecessary DIY.