What is the correct button for setting autopilot on and off

[Normandee]

Hi Guys

I have a joystick button binding to PUSH AP?TRIMDISC but this does nothing when attempting to activate autopilot have searched the net but cant find anything on the TBM 900

It works fine if i manually push the AP Button on the autopilot panel.

Any information on this Autopilot would be really appreciated.

Regards

Norman