Page 4033 of 4171

WCS-56
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
58 W/R Optical sensorInput ONWhen optical sensor is illumi-
nated
3.1V or more
When optical sensor is not illu-
minated 0.6V or less
59 G Front door lock as-
sembly LH actuator
(unlock) Output OFF
OFF (neutral)
0V
ON (unlock) Battery voltage
60 G/B Turn signal (left) Output ON Turn left ON
61 G/Y Turn signal (right) Output ON Turn right ON
62 R/W Step lamp LH and RH Output OFF ON (any door open)
0V
OFF (all doors closed) Battery voltage
63 L Interior room/map
lamp Output OFFAny door
switchON (open)
0V
OFF (closed) Battery voltage
65 V All door lock actuators
(lock) Output OFFOFF (neutral)
0V
ON (lock) Battery voltage
66 G/Y Front door lock actua-
tor RH, rear door lock
actuators LH/RH and
back door lock actua-
tor (unlock) Output OFF
OFF (neutral)
0V
ON (unlock) Battery voltage
67 B Ground Input ON—0V
68 W/L Power window power
supply (RAP) Output —Ignition switch ON
Battery voltage
Within 45 seconds after igni-
tion switch OFF Battery voltage
More than 45 seconds after ig-
nition switch OFF 0V
When front door LH or RH is
open or power window timer
operates 0V
69 W/R Power window power
supply
Output —
—Battery voltage
70 W/B Battery power supply Input OFF —Battery voltage
Te r m i n a l
Wire
color Signal name Signal
input/
output Measuring condition
Reference value or waveform
(Approx.)
Ignition
switch Operation or condition
SKIA3009J
SKIA3009J
Revision: December 20092009 QX56
Page 4034 of 4171
WCS
BCM (BODY CONTROL MODULE)WCS-57
< ECU DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
Wiring DiagramINFOID:0000000004115467
AAMWA0236GB
Revision: December 20092009 QX56
Page 4035 of 4171
WCS-58
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
ABMWA0015GB
Revision: December 20092009 QX56
Page 4036 of 4171
WCS
BCM (BODY CONTROL MODULE)WCS-59
< ECU DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
AAMWA0237GB
Revision: December 20092009 QX56
Page 4037 of 4171
WCS-60
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
ABMIA0023GB
Revision: December 20092009 QX56
Page 4038 of 4171
WCS
BCM (BODY CONTROL MODULE)WCS-61
< ECU DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
ABMIA0024GB
Revision: December 20092009 QX56
Page 4039 of 4171

WCS-62
< SYMPTOM DIAGNOSIS >
THE LIGHT REMINDER WARNING DOES NOT SOUND
SYMPTOM DIAGNOSIS
THE LIGHT REMINDER WARNING DOES NOT SOUND
DescriptionINFOID:0000000003776730
Light reminder warning does not sound even though headlamp is illuminated.
Diagnosis ProcedureINFOID:0000000003776731
1.CHECK COMBINATION SWITCH (LIGHTING SWITCH) OPERATION
Check that the headlamps operate normally by operat ing the combination switch (lighting switch).
Do they operate normally?
YES >> GO TO 2
NO >> Refer to EXL-4, "
Work Flow".
2.CHECK FRONT DOOR SWITCH LH SIGNAL CIRCUIT
Perform inspection of the front door s witch LH signal circuit. Refer to DLK-71, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK FRONT DOOR SWITCH LH
Perform a unit inspection for the front door switch LH. Refer to DLK-71, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace the BCM. Refer to BCS-56, "Removal and Installation".
NO >> Replace the front door switch LH.
Revision: December 20092009 QX56
Page 4040 of 4171

WCS
THE SEAT BELT WARNING CONTINUES SOUNDING, OR DOES NOT SOUND
WCS-63
< SYMPTOM DIAGNOSIS >
C
D E
F
G H
I
J
K L
M B A
O P
THE SEAT BELT WARNING CONTIN UES SOUNDING, OR DOES NOT
SOUND
DescriptionINFOID:0000000003776732
• Seat belt warning does not sound even though driver seat belt is not fastened.
• Seat belt warning sounds even though driver seat belt is fastened.
Diagnosis ProcedureINFOID:0000000003776733
1.CHECK WARNING CHIME OPERATION
1. With key removed from key switch and the front door LH open, turn lighting switch to 1st or 2nd position.
2. Return lighting switch to off position, and insert key into key switch.
Does warning chime sound for both steps?
YES >> GO TO 2
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
2.CHECK SEAT BELT WARNING LAMP
1. Turn ignition switch ON.
2. Check the operation of the seat belt warning lamp in the combination meter.
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-56, "Removal and Installation".
NO >> GO TO 3
3.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
Perform inspection of the seat belt buckle switch circuit. Refer to WCS-19, "
DiagnosisProcedure".
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair harness or connector.
4.CHECK SEAT BELT BUCKLE SWITCH UNIT
Perform a unit inspection for the seat belt buckle switch. Refer to WCS-20, "
Component Inspection".
Is the inspection result normal?
YES >> Replace the combination meter. Refer to MWI-102, "Removal and Installation".
NO >> Replace the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch). Seat belt fastened : OFF
Seat belt not fastened : ON
Revision: December 20092009 QX56