Yamaha MTN850-A 2017, Service Manual, Page: 472 / 560

IMMOBILIZER SYSTEM
8-115
EAS30522
TROUBLESHOOTING
When the main switch is turned to “ON”, the immobilizer system indicator light does not come on nor
flashes.
EAS30523
SELF-DIAGNOSIS FAULT CODE INDICATION
When a system failure occurs, the immobilizer system indicator light blinks. The pattern of blinking
shows the fault code.
1. Check the fuses.
(Main, ignition, and backup)
Refer to “CHECKING THE FUSES”
on page 8-156.
NG

Replace the fuse(s).
OK

2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-158.
NG

• Clean the battery terminals.
• Recharge or replace the battery.
OK

3. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-153.
NG

Replace the main switch/immobilizer unit.
OK

4. Check the entire immobilizer sys-
tem wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-109.
NG

Properly connect or repair the immobilizer
system wiring.
OK

•
Check the condition of the each im-
mobilizer system circuits.
•
Refer to “SELF-DIAGNOSIS FAULT
CODE INDICATION” on page 8-115.
Fault
code
Part Symptom Cause Action
51 IMMOBILIZER
UNIT
Code cannot be trans-
mitted between the
key and the immobi-
lizer unit.
1. Radio wave interfer-
ence caused by objects
around the keys and
antennas.
2. Immobilizer unit mal-
function.
3. Key malfunction.
1. Keep magnets,
metal objects, and
other immobilizer
system keys away
from the keys and
antennas.
2. Replace the main
switch/immobi-
lizer unit.
3. Replace the key.
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 consecu-
tive attempts).
2. Signal received from
unregistered standard
key.
1. Place the immobi-
lizer unit at least
50 mm away from
the transponder of
other vehicles.
2. Register the stan-
dard key.