PIAGGIO 633823 Service Station Manual page 62

Electrical system
Level indicators and enable signals section
KEY
1. Immobilizer aerial
2. Injection ECU
3. Revolution sensor
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
38. Locking/unlocking switch
39. Geared motor
40. Right tone wheel
41. Left tone wheel
42. Brake calliper sensor
43. Parking electronic control unit
44. Oil pressure sensor
45. Hand brake
46. Rider presence sensor
47. Potentiometer
48. Instrument panel
ELE SYS - 12
MP3 250 i.e.