Yamaha MT-09 2021 - Page 625

9-195
P056C
3. Check the fuse. (signaling system fuse and brake light fuse)
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
Is it in the “Recovered” condition?
YES
→Go to step 11, and complete the service.
NO
→Go to step 3.
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.
Between brake light fuse holder “1” and front
brake light switch coupler “2”
green/white–green/white
Between front brake light switch coupler “2” and
rear brake light switch coupler “3”
green/yellow–green/yellow
Between rear brake light switch coupler “3” and
brake light relay coupler “4”
light green/black–light green/black
Between brake light relay coupler “4” and
ground
black–ground
Between brake light relay coupler “4” and ECU
coupler “5”
light green/black–light green/black
Gy LLVP P/WLg/LO/WY/LL/B
B/LB/LBr/WGy/GG/LBr/LB/YL/W
W/YW/GG/WG/WLg/BL/WL/Y
1
Y
L/R
B Lg/B
G/W Y/B
G/Y
Y/W
G/Y Y/B
Lg/B
Lg/L
5
4
3
2