OK, according to FR it would activate signal from
Automatic
Transmission
Def CWMDBGRG for version MDBGRG 4.120.0
bit 0 -> limitation from AT
bit 1 -> limitation from mibgrg_w "fast track"
bit 2 -> switch to external Tmot signal
bit 3 -> switch to break signal
bit 4 -> switch to Tmot signal from dashboard
but...I'm always open to learn