P056C; Troubleshooting - Yamaha XSR 900 2022 Service Manual

EAS20595

P056C

EAS33075

TROUBLESHOOTING

Item
• Front brake light switch: open or short circuit is detected. Normal signal is not sent to ECU.
• Rear brake light switch: open or short circuit is detected. Normal signal is not sent to ECU.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
1. Locate the malfunction.
a. Execute the diagnostic mode. (Code 82, 83)
When the front brake is applied
When the front brake is not applied
Is check result OK?
YES
→Go to step b.
NO
→Go to step 2.
TIP
Perform the procedure from step 2 to step 5, and from step 10 to step 11.
b. Execute the diagnostic mode. (Code 82, 83)
When the rear brake is applied
When the rear brake is not applied
c. Confirm that it is defective.
d. Go to step 6.
TIP
Perform the procedure from step 6 to step 11.
2. Connection of ECU coupler, front brake light switch coupler, brake light relay coupler and main
switch 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).
Is the coupler condition normal?
YES
→Go to step 3.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "ON".
c. Operate the front brake lever, and then check the DTC using the malfunction mode of the YDT.
9-195
P056C
ON
OFF
ON
OFF