Half of the adjustments for the drivers seat in my 2007 A8L suddenly stopped working. The seat base will move forward and back as well as tilt forward and back. The seat back will only tilt.
The seat extender, lumbar adjustments, headrest, seat belt, steering wheel adjust and upper back tilt are not working at all. I verified fuse 40 in left side dash is good (steering wheel adjust), and verified breakers D & E behind instrument panel left have continuity. I also verified that all connectors are seated well under the seat.
Does anyone know if these functions are segregated between two modules, relays or breakers? What would be the next step in troubleshooting this issue? I am clueless at this point. HELP!

 

You really need a VCDS scan at this point to determine if the module or switches are bad.
You could throw parts at it, but that will get expensive fast....