Yamaha FJR1300A(D) Service Manual page 542

Fault code No.
Item
6 Check the fuse. (signaling
system fuse, brake light fuse)
7 Wire harness continuity.
8 Defective front brake light
switch.
9 Malfunction in ECU.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
90
A Front brake light switch: open or short circuit is detected.
B Rear brake light switch: open or short circuit is detected.
Abnormality → Replace the
fuse. (signaling system fuse,
brake light fuse)
Open or short circuit → Re-
place the wire harness.
Between battery and main
switch coupler.
red–red
Between main switch coupler
and fuse box 1 (signaling
system fuse).
brown/blue–brown/blue
Between fuse box 1 and
brake light fuse.
brown–brown
Between brake light fuse and
front brake light switch cou-
pler.
green/white–green/white
Between front brake light
switch coupler and brake
switch relay coupler.
green/yellow–green/yellow
Between brake switch relay
coupler and ECU coupler.
light green/black–light
green/black
Replace the front brake light
switch.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-174.
90
A Front brake light switch: open or short circuit is detected.
B Rear brake light switch: open or short circuit is detected.
Able to start engine
Able to drive vehicle
82, 83
8-93
CRUISE CONTROL SYSTEM
Turn the main switch to "ON".
Operate the brake lever.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 7.
Turn the main switch to "ON".
Operate the brake lever.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 8.
Turn the main switch to "ON".
Operate the brake lever.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 9.