Yamaha XMAX 125, Service Manual

Page: 465 / 498

IMMOBILIZER SYSTEM
8-68
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
52 IMMOBILIZER
UNIT Codes between the
key and immobilizer
unit do not match. 1. Signal received from
other transponder
(failed to recognize
code after ten con-
secutive attempts).
2. Signal received from
unregistered stan-
dard key.
1. Place the immo-
bilizer unit at
least 50 mm
away from the
transponder of
other vehicles.
2. Register the
standard key.
53 IMMOBILIZER
UNIT Codes cannot be
transmitted be-
tween the ECU and
the immobilizer unit. Noise interference or
disconnected lead/ca-
ble.
1. Interference due to
radio wave noise.
2. Disconnected com-
munication harness.
3. Immobilizer unit mal-
function.
4. ECU malfunction.
1. Check the wire
harness and
connector.
2. Replace the
main switch/im-
mobilizer unit.
3. Replace the
ECU.
54 IMMOBILIZER
UNIT Codes transmitted
between the ECU
and the immobilizer
unit do not match. Noise interference or
disconnected lead/ca-
ble.
1. Interference due to
radio wave noise.
2. Disconnected com-
munication harness.
3. Immobilizer unit mal-
function.
4. ECU failure.
(The ECU or immobi-
lizer unit was re-
placed with a used
unit from another ve-
hicle.)
1. Register the
code re-register-
ing key.
2. Check the wire
harness and
connector.
3. Replace the
main switch/im-
mobilizer unit.
4. Replace the
ECU.
55 IMMOBILIZER
UNIT Key code registra-
tion malfunction. Same standard key was
attempted to be regis-
tered two consecutive
times.
Register another
standard key.
56 ECU Unidentified code is
received. Noise interference or
disconnected lead/ca-
ble. 1. Check the wire
harness and
connector.
2. Replace the
main switch/im-
mobilizer unit.
3. Replace the
ECU.
Fault
code
Part Symptom Cause Action