Yamaha MT-03 Service Manual page 364

Fault
Part
code
55 IMMOBILIZER Key code
UNIT
56 ECU
Immobilizer system indicator light fault code indication
Units of 10: Cycles of on for 1 second and off for 1.5 seconds.
Units of 1: Cycles of on for 0.5 second and off for 0.5 second.
Example: fault code 52
a. Light on
b. Light off
Symptom
registration
malfunction.
Unidentified code
is received.
8-37
IMMOBILIZER SYSTEM
Cause
Same standard key
was attempted to be
registered two
consecutive times.
Noise interference
or disconnected
lead/cable.
1. Obstruction due to
radio wave noise.
2. Error by disconnection
of the communication 3. Replace the
harness.
Action
Register another
standard key.
1. Check the wire
harness and
connector.
2.Replace the
main switch/
immobilizer unit.
ECU.