KEY
1. Battery
2. Fuse No. 1
3. Fuse No. 4
4. Ignition key contacts
5. Headlight relay
6. Fuse No. 5
7. Electronic control unit
8. Daylight running light bulbs, license plate light
9. High/low beam two-light bulb
10. Light switch
11. Light switch
WARNING
ALL CONTINUITY TESTS MUST BE CARRIED OUT WITH THE CORRESPONDING CONNECTORS
DISCONNECTED.
LINE FOR DAYLIGHT RUNNING LIGHTS, LICENSE PLATE LIGHT AND DASHBOARD LIGHTING
BULB
1) Check that bulbs operate properly.
2) Check fuses No. 1 and 5.
3) Check the ignition switch and light switch contacts.
4) With the key switch set to «ON» check if there is voltage between the Grey-White cable of the fuse
No 5 and the ground connection. If there is not, check cable harnesses.
5) Check cable harness continuity between the fuse No 5 and the light switch (Grey-White cable).
6) Check that the cable harnesses of the bulbs and their ground connection are not interrupted.
HIGH BEAM/LOW BEAM LIGHTS LINE
1) Check that bulbs operate properly.
2) Check fuses No. 1 and 4.
3) Check ignition switch contacts.
4) Check if there is voltage between the Grey-Red cable of the headlight remote control and the ground
connection. If there is not, check cable harnesses.
5) With the key switch set to «ON», light switch in position 2 and the engine running, check if there is
voltage between the Grey cable of the headlight remote control and the ground connection. If there is
not, check cable harnesses.
6) Check that the White-Black cable connecting the headlight solenoid and the control unit (pin 33) is
not interrupted.
7) Check the headlight remote control switch.
8) Check that the continuity between the Grey cable of the light switch and the headlight remote control
is not interrupted.
9) Check the light switch contacts.
Vespa LX - S 125 3V ie 150 3V ie (2012) Electrical system
ELE SYS - 89
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