Yamaha MT-09 2021 Service Manual page 625

Is it in the "Recovered" condition?
YES
→Go to step 11, and complete the service.
NO
→Go to step 3.
3. Check the fuse. (signaling system fuse and brake light fuse)
Is check result OK?
YES
→Go to step 4.
NO
a. Replace the fuse.
b. Turn the main switch to "ON".
c. Operate the front brake lever, and then check the condition of the DTC using the malfunction
mode of the YDT.
Is it in the "Recovered" condition?
YES
→Go to step 11, and complete the service.
NO
→Go to step 4.
4. Wire harness continuity.
• Disconnect the brake light fuse "1", front brake light switch coupler "2", rear brake light switch coupler
"3", brake light relay coupler "4" and ECU coupler "5".
• Open circuit check
Between brake light fuse holder "1" and front
brake light switch coupler "2"
Between front brake light switch coupler "2" and
rear brake light switch coupler "3"
Between rear brake light switch coupler "3" and
brake light relay coupler "4"
Between brake light relay coupler "4" and
ground
Between brake light relay coupler "4" and ECU
coupler "5"
1
2
G/W Y/B
G/Y Y/W
4
L/R
3
Lg/B Y
G/Y Y/B
Lg/B Lg/L
green/white–green/white
green/yellow–green/yellow
light green/black–light green/black
black–ground
light green/black–light green/black
5
L/B
B
9-195
Y/L O/W Lg/L P/W P V L
L/W B/Y Br/L G/L Gy/G Br/W B/L
L/Y L/W Lg/B G/W G/W
P056C
L Gy
B/L
W/G W/Y