Checking The Signaling System - Yamaha YXR70FX 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 switch
• Check the brake light switch for continuity.
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 - 36
3. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light connectors (wire harness
side) as shown.
Positive tester probe → yellow 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Push down on the brake pedal.
• Measure the voltage (12 V) of yellow 1 on
the tail/brake light connectors (wire har-
ness side).
• Is the voltage within specification?
YES
This circuit is OK.
– +
ELEC
NO
The wiring circuit
from the main switch
to the tail/brake light
connector is faulty
and must be
repaired.