Yamaha MT-09 2021 Service Manual page 629

Is resistance 0 Ω?
YES
→Go to "Short circuit check".
NO
a. Replace the wire harness.
b. Turn the main switch to "ON".
c. Operate the rear brake pedal, 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 "Short circuit check".
• Short circuit check
TIP
Disconnect the ECU related connectors before checking.
Refer to "PARTS CONNECTED TO THE ECU" on page 9-4.
Ground short circuit check "A"
Between brake light relay coupler "4" and
ground
Between front brake light switch coupler "2" and
ground
Lines short circuit check "B"
Brake light relay coupler "4"
Front brake light switch coupler "2"
Rear brake light switch coupler "3"
ECU coupler "5"
A
4
2
L/R
G/W Y/B
G/Y Y/W
Lg/B Y B
light green/black–ground
green/white–ground
green/yellow–ground
light green/black–any other coupler terminal
green/white–any other coupler terminal
green/yellow–any other coupler terminal
green/yellow–any other coupler terminal
light green/black–any other coupler terminal
light green/black–any other coupler terminal
B
2
G/W Y/B
4
G/Y Y/W
L/R
Lg/B Y B
3
G/Y Y/B
Lg/B Lg/L
9-199
5
L/B Y/L O/W Lg/L P/W P V
L/W B/Y Br/L G/L Gy/G Br/W
L/Y L/W Lg/B G/W G/W
P056C
L L Gy
B/L B/L
W/G W/Y