Checking The Immobilizer System - Yamaha 2004 YP400 Service Manual

EAS00788

CHECKING THE IMMOBILIZER SYSTEM

1. The immobilizer system indicator light does
not come on.
1. Immobilizer system indicator light (LED)
• Check the immobilizer system indicator
light for continuity.
Refer to "CHECKING THE LEDs".
• Is the immobilizer system indicator light
OK?
YES
2. Voltage
• Connect the pocket tester (DC 20 V) to the
immobilizer unit coupler as shown.
3 2
B B R/G R/G
R/W
Y/L G/L R/W
1
Positive tester probe →
red/white 1 or red/green 2
Negative tester probe → black 3
• Turn the main switch to "ON".
• Measure the voltage (DC 12 V) on the
immobilizer unit coupler (wire harness
side).
• Is the voltage within specification?
YES
NO
Replace the meter
assembly.
B B
Lg Y/L
NO
The wiring circuit
from the main switch
to the immobilizer
unit coupler is faulty
and must
repaired.
IMMOBILIZER SYSTEM
3. Wiring
• Disconnect the meter coupler and immobi-
lizer unit coupler.
• Check the immobilizer system indicator
light lead (green/blue) continuity.
(meter coupler – immobilizer unit coupler).
• Is the immobilizer system indicator light
lead OK?
Replace
switch/immobilizer
unit.
2. No malfunction code is displayed on the
LCD display of the meter assembly.
1. Voltage
• Connect the pocket tester (DC 20 V) to the
meter coupler as shown.
Ch Dg
G/L
LCD display
Positive tester probe →
Negative tester probe → black 3
• Turn the main switch to "ON".
• Measure the voltage (DC 12 V) at the
meter coupler (wire harness side).
• Is the voltage within specification?
Replace the meter
be
assembly.
8 - 57
ELEC
YES
the main The wiring
from
assembly to immobi-
lizer unit is faulty and
must be repaired.
1 2
Y R/W R/G G
L Y/L B/L Gy
red/white 1 or red/green 2
YES
The wiring
from the main switch
to the meter coupler
is faulty and must be
repaired.
– +
NO
circuit
the meter
B
3
NO
circuit