Yamaha 2007 XP500 Service Manual page 20

FEATURES
Composition and operation
The fail-safe relay is composed of the solenoid relay "1" and fail-safe relay "2". The solenoid relay is
activated (continuous) by signals transmitted from the ECU (ABS). As a result, the solenoid valve "3"
can be operated.
If a malfunction occurs in the circuit, the solenoid relay is deactivated and it becomes impossible for the
solenoid valve to reduce the hydraulic pressure of the brake fluid and normal braking is resumed.
The fail-safe relay is also activated by signals transmitted from the ECU (ABS) and operates simulta-
neously when the ABS starts to reduce the hydraulic pressure of the brake fluid.
If the solenoid relay is turned off, the motor relay is also deactivated and the motor stops operating if
there is a malfunction.
1. Solenoid relay
2. Fail-safe relay
3. Solenoid valve
4. ECU (ABS)
5. Pump motor relay coil
6. Pump motor monitor
7. ABS warning light
8. Fail-safe relay coil
9. Rear solenoid
10. Front solenoid
11. Power
12. Fail-safe relay
13. Hydraulic unit
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