Are the SW audio controls programmable on the 2019 Toyota 86 TRD
 

Hi guys,

Recently I checked an MY19 86 TRD and wonder whether the empty SW audio controls are functional or can be programmed if a head unit change is planned.
The battery was dead on the car, so most of the things were not functional. Pressing on the empty button was not possible (I think they are not functional). Is the steering wheel control only volume up and down?