Yamaha 2005 BT1100 Supplementary Service Manual page 68

CHECKING THE IMMOBILIZER SYSTEM
1. Immobilizer system indicator light does not go
on when the main switch is turned "ON".
1. Voltage
• Connect the pocket tester (DC 20 V) to the
multi-function display couplers as shown.
Tester positive probe – green/blue 1
Tester negative probe – black 2
2
RG Br B GW
W YB
• Set the main switch to "ON".
• Measure the voltage (12 V) between green/
blue and black on the multi-function display.
• Are the voltage within specification?
YES
Replace the multi-
function display
2. Voltage
• Connect the pocket tester (DC 20 V) to the
immobilizer unit couplers as shown.
Tester positive probe – red/ green 1
Tester negative probe – black 2
2
1
B B2 RG
YL GL RW
1
Dg Ch GL
Y BW
SbW
NO
RG B2 B
RW GL YL
IMMOBILIZER SYSTEM
• Set the main switch to "ON".
• Measure the voltage (12 V) between red/
green and black on the immobilizer unit.
• Are the voltage within specification?
YES
3. Voltage
• Connect the pocket tester (DC 20 V) to the
immobilizer unit couplers as shown.
Tester positive probe – red/white 1
Tester negative probe – black 2
2
B B2 RG
YL GL RW
• Set the main switch to "ON".
• Measure the voltage (12 V) between red/
white and black on the immobilizer unit.
• Are the voltage within specification?
YES
60
ELEC
NO
The wiring circuit
from the battery to
the immobilizer unit
is faulty and must be
repaired.
RG B2 B
RW GL YL
1
NO
The wiring circuit from
the main switch to the
immobilizer unit is
faulty and must be re-
paired.