Troubleshooting - Yamaha 2004 YP400 Service Manual

EAS00794

TROUBLESHOOTING

• Any of the following fail to light: turn
signal light, brake light or an indicator
light.
• The horn fails to sound.
Check:
1. main, ignition, signaling system, turn signal/
hazard, and backup fuses
2. battery
3. main switch
4. wiring connections
(of the entire signaling system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. storage box
2. front cowling
3. meter assembly
• Troubleshoot with the following special
tool(s).
Pocket tester
90890-03112, YU-03112-C
EAS00738
1. Main, ignition, signaling system, turn sig-
nal/hazard, and backup fuses
• Check the main, ignition, signaling system,
turn signal/hazard, and backup fuses for
continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main, ignition, signaling system,
turn signal/hazard, and backup fuses OK?
YES
NO
Replace the fuse(s).
SIGNALING SYSTEM
EAS00739
2. Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
• Is the battery OK?
EAS00749
3. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
EAS00795
4. Wiring
• Check the entire signal system's wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the signaling system's wiring properly
connected and without defects?
Check the condition
of each of the signal-
ing system's circuits.
Refer to "CHECK-
ING THE SIGNAL-
ING SYSTEM".
8 - 37
ELEC
YES
• Clean the battery
terminals.
• Recharge or
replace the battery.
YES
Replace the
switch/immobilizer
unit.
YES
Properly connect or
repair the signaling
system's wiring.
– +
NO
NO
main
NO