PIAGGIO 633929(IT) Service Station Manual page 208

Suspensions
0: REST POSITION
1: LOCKING POSITION
2: UNLOCKING POSITION
3: TILT LOCKING-UNLOCKING SWITCH
With interface wiring disconnected from the control
unit, check the continuity of the electrical lines be-
tween the interface wiring and the tilt locking-un-
locking switch:
Pin 26 and green - grey cable
Pin 35 and violet - black cable
Pin 33 and yellow - blue cable
Also check that the above indicated electrical lines
are insulated from the earth.
SUSP - 36
MP3 125