Seat control module, A-Class W176

Hello,
We want to operate a fully electrically adjustable seat from the new A-Class outside of the vehicle.
We have already started simulating the remaining bus system, but we are currently stuck due to issues with the pin assignments of the control unit from Conti.

There are 6 pins there - 2 large and 4 small.
Pin 3: Positive (+) (larger pin).
Pin 4: Ground (larger pin).
Pin 29: CAN High.
PIN 30: CAN Low.

Then there are also two small pins at positions 18 and 25.

Pin 18 also appears to be a power supply line. On the vehicle side, it is protected by a 7.5A interior fuse.

Pin 25 is completely unclear.

We have an external power supply that we connect to pins 3 and 4, and a 9-pin D-sub connector that connects to our residual bus simulation.

Regards,
Peter.