Service Manual — page 454 of 715

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12-32 BRAKES
Anti-Lock Brake System
○The yellow ABS indicator light (LED) may come on if the
 engine is run with the motorcycle on its stand and the
 transmission in gear. If the indicator light comes on, just
 turn the ignition switch OFF, then clear service code 42,
 which indicates a “Faulty front wheel rotation sensor”.
○When the ABS operates, the ABS makes noise and the
 rider feels the reaction force on the brake lever and brake
 pedal. This is a normal condition. It informs the rider that
 the ABS is operating normally.
○Service codes detected once by the ABS hydraulic unit
 will be memorized in the ABS hydraulic unit. Therefore,
 after maintenance work is finished, be sure to erase the
 service codes. Do not erase the service codes during
 troubleshooting. Wait until all the checks and repair work
 are finished to prevent duplication of previous service
 codes and unnecessary maintenance work.
○Before delivering the motorcycle to the customer, be
 sure to erase any service codes which might be stored in
 the ABS hydraulic unit. Using the self-diagnosis feature,
 make sure that the yellow ABS indicator light (LED) lights.
 A fully charged battery is a must for conducting reliable
 self-diagnosis. Test run the motorcycle at a speed of
 more than 20 km/h (12 mph) to see that the yellow ABS
 indicator light (LED) does not come on. Finally, test run
 the motorcycle at a speed of more than 30 km/h (20 mph)
 and brake suddenly to see that the motorcycle stops
 without loss of steering control and the ABS operates
 normally (The reaction force generated is felt in the brake
 lever and pedal.). This completes the final inspection.
ABS Troubleshooting Outline
  When an abnormality in the system occurs, the yellow
ABS indicator light (LED) lights up to alert the rider. In ad-
dition, the nature of the fault is stored in the memory of the
ABS hydraulic unit and when in the self-diagnosis mode,
the service code [A] is indicated by the number of times the
yellow ABS indicator light (LED) blinks. The service codes
stored in memory are not erased until the mode has been
changed to the fault erase mode after the fault has been
corrected. Therefore, after correcting the problem, always
erase the service codes and then run the self-diagnosis pro-
gram to confirm normal signal output. When, due to a mal-
function, the yellow ABS indicator light (LED) remains lit, get
a thorough understanding of the background before starting
the repair work. Ask the rider about the conditions [B] under
which the problem occurred and try to determine the cause
[C]. Do not rely solely on the ABS self-diagnosis function,
use common sense; check the brakes for proper braking
power, and brake fluid level, search for leaks, etc.
  If the yellow ABS indicator light (LED) blinks when the
ignition switch is turned to ON or the motorcycle is running,
ABS system does not function. In this case, the voltage of
the battery is extremely low.