Yamaha 2007 XP500 Service Manual page 403

Check if the hydraulic unit solenoid coupler located in the front cowling is connected properly.
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3. Wire harness (ABS system circuit)
Check the pink/white leads between the ECU (ABS) and the fail-safe relay for continuity. (Refer to
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"CIRCUIT DIAGRAM".)
ECU (ABS) coupler terminal (pink/white) is disconnected. → [D-1]
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Check the red leads between "1" and "2", and between "1" and "3" of the hydraulic unit solenoid cir-
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cuits for continuity.
1. Red
2. Red
3. Red
4. Fale-safe relay
Check if the fail-safe relay operates correctly. → [D-2]
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5. Wire harness
Check for continuity between the red terminal of the fail-safe relay coupler and the positive battery
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terminal.
Remove the ABS fuse and check for continuity between the brown/white "1"lead of the fail-safe relay
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coupler and the ABS fuse"2". (See the illustration below.)
1. Check for continuity between these two points
ABS (ANTI-LOCK BRAKE SYSTEM) (XP500A)
2
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4. Front solenoid
5. Rear solenoid
6. Fail-safe relay