Yamaha MTN1000 2016 Service Manual page 549

Fault code No.
Item
B-5 Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
B-6 Check the fuse. (main fuse, sig-
naling system fuse, brake light
fuse)
B-7 Wire harness continuity.
B-8 Defective rear brake light
switch.
B-9 Malfunction in ECU.
P056C
A Front brake light switch: open or short circuit is detected.
B Rear brake light switch: open or short circuit is detected.
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
Abnormality  Replace the
fuse. (main fuse, signaling sys-
tem fuse, brake light fuse)
Open or short circuit  Replace
the wire harness.
Between battery and main
switch coupler.
red–red
Between main switch coupler
and rear brake switch.
brown/blue–green/yellow
Between rear brake light switch
coupler and brake light relay
coupler.
light green/black–light
green/black
Between brake light relay cou-
pler and ECU coupler.
light green/black–light
green/black
Between brake light relay cou-
pler and battery.
black–black
Replace the rear brake light
switch.
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-194.
8-132
CRUISE CONTROL SYSTEM
Turn the main switch to "ON".
Operate the brake pedal, and
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item B-10 and finish the ser-
vice.
Condition is "Detected"  Go to
item B-6.
Turn the main switch to "ON".
Operate the brake pedal, and
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item B-10 and finish the ser-
vice.
Condition is "Detected"  Go to
item B-7.
Turn the main switch to "ON".
Operate the brake pedal, and
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item B-10 and finish the ser-
vice.
Condition is "Detected"  Go to
item B-8.
Turn the main switch to "ON".
Operate the brake pedal, and
then check the condition of the
fault code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item B-10 and finish the ser-
vice.
Condition is "Detected"  Go to
item B-9.