Checking The Signaling System - Yamaha YFM7FGPW Service Manual

EBS01075

CHECKING THE SIGNALING SYSTEM

EBS01076
1. The brake light fails to come on.
1. Brake light bulb and bulb socket
• Check the brake light bulb and bulb socket
for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the brake light bulb and bulb socket
OK?
YES
2. Brake light switches
• Check the brake light switches for continu-
ity.
Refer to "CHECKING THE SWITCHES".
• Is the brake light switch OK?
YES
SIGNALING SYSTEM
NO
Replace the brake
light bulb, bulb
socket or both.
NO
Replace the brake
light switch.
9 - 37
EBS01053
3. Diode 3
• Remove the diode 3 from the wire har-
ness.
• Connect the pocket tester (Ω × 1) to the
diode 3 as shown.
• Measure the diode 3 for continuity as fol-
lows.
NOTE:
_
The pocket tester 90890-03112 and the ana-
log pocket tester YU-03112-C readings are
shown in the following table.
Positive tester probe →
yellow/white 1
Negative tester probe →
yellow 2
Positive tester probe →
yellow 2
Negative tester probe →
yellow/white 1
Y
Y/W
• Are the testing readings correct?
YES
– +
ELEC
Continuity
No
continuity
1
2
NO
Replace the diode 3.