200 INFINITI QX56 2009 Factory Service Manual

WCS
POWER SUPPLY AND GROUND CIRCUITWCS-17
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Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
Terminal No. Signal nameFuses and fusible link No.
57 Battery power supply 22 (15A)
70 F (50A)
11 Ignition ACC or ON 4 (10A)
38 Ignition ON or START 59 (10A)
ConnectorTe r m i n a l s
Power
source Condition Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON
or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch OFF Battery voltage
LIIA2415E
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
Revision: December 20092009 QX56

WCS-18
< COMPONENT DIAGNOSIS >
METER BUZZER CIRCUIT
METER BUZZER CIRCUIT
DescriptionINFOID:0000000003776708
• The buzzer for warning chime system is installed in the combination meter.
• The combination meter sounds the alarm buzzer based on the signals transmitted from various units.
Component Function CheckINFOID:0000000003776709
1.CHECK OPERATION OF METER BUZZER
1. Select “BUZZER” of “BCM” on CONSULT-III.
2. Perform “LIGHT WARN ALM” of “ACTIVE TEST”.
Does meter buzzer activate?
YES >> Inspection End.
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
Diagnosis ProcedureINFOID:0000000003776710
1.CHECK POWER SUPPLY OF COMBINATION METER
Check power supply of combination meter. Refer to WCS-16, "
COMBINATION METER : Diagnosis Proce-
dure".
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair power supply circuit of combination meter.
Revision: December 20092009 QX56

WCS
SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
WCS-19
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SEAT BELT BUCKLE SW ITCH SIGNAL CIRCUIT
DescriptionINFOID:0000000003776711
Transmits a seat belt buckle switch signal to the combination meter.
Component Function CheckINFOID:0000000003776712
1.CHECK COMBINATION METER INPUT SIGNAL
Select “DATA MONITOR” for “METER/M&A” and check the “SEAT BELT W/L” monitor value.
>> Inspection End.
Diagnosis ProcedureINFOID:0000000003776713
1.CHECK COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between combination meter harness connector M24 terminal 24 and ground.
Is the inspection result normal?
YES >> Replace combination meter. Refer to MWI-102,
"Removal and Installation".
NO >> GO TO 2
2.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) connector.
3. Check continuity between combination meter harness connector M24 (B) terminal 24 and seat belt buckle pre-tensioner assem-
bly LH (seat belt buckle switch ) harness connector B74 (A) ter-
minal 4.
4. Check continuity between combination meter harness connector M24 (B) terminal 24 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair harness or connector.
3.CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT SEAT BELT W/L
When seat belt is fastened : OFF
When seat belt is unfastened : ON
24 - Ground
When driver seat belt is fastened : Approx. 12V
When driver seat belt is unfastened : Approx. 0V
AWNIA0212ZZ
24 - 4
: Continuity should exist.
24 - Ground : Continuity should not exist.
AWNIA0213ZZ
Revision: December 20092009 QX56

WCS-20
< COMPONENT DIAGNOSIS >
SEAT BELT BUCKLE SWITCH SIGNAL CIRCUIT
Check continuity between seat belt buckle pre-tensioner assembly
LH (seat belt buckle switch) harness connector B74 terminal 3 and
ground.
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000003776714
1.CHECK SEAT BELT BUCKLE SWITCH
1. Turn ignition switch OFF.
2. Disconnect the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) connector.
3. Check continuity between terminals 3 and 4.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch).
3 - Ground : Continuity should exist.
AWNIA0288ZZ
3– 4
When seat belt is
fastened
: Continuity should not exist.
When seat belt is
unfastened : Continuity should exist.
AWNIA0289ZZ
Revision: December 20092009 QX56

WCS
KEY SWITCH SIGNAL CIRCUITWCS-21
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KEY SWITCH SIGNAL CIRCUIT
DescriptionINFOID:0000000003776715
Transmits a key switch signal to the BCM.
Component Function CheckINFOID:0000000003776716
1.CHECK BCM INPUT SIGNAL
Select “DATA MONITOR” for “BCM” and c heck the “KEY ON SW” monitor value.
>> Inspection End.
Diagnosis ProcedureINFOID:0000000003776717
1.CHECK FUSE
Check if the key switch and ignition knob switch 10A fuse (No. 62, located in the fuse and relay box) is blown.
Is the fuse blown?
YES >> Be sure to repair the cause of malfunction before installing new fuse.
NO >> GO TO 2
2.CHECK BCM INPUT SIGNAL
Check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES >> Inspection End.
NO >> GO TO 3
3.CHECK KEY SWITCH CIRCUIT
1. Disconnect BCM and key switch and ignition knob switch con- nectors.
2. Check continuity between BCM harness connector M18 and key switch and ignition knob switch harness connector M12.
3. Check continuity between BCM harness connector M18 and ground.KEY ON SW
When key is inserted into key cylinder : ON
When key is removed from key cylinder : OFF
Te r m i n a l s
ConditionVo l ta g e
(Approx.)
(+)
(−)
BCM
connector Te r m i n a l
M18 37 Ground Key is inserted Battery voltage
Key is removed 0
PKIC0721E
AB
Continuity
Connector Terminal Connector Terminal
M18 37M12 4 Yes
A GroundContinuity
Connector Terminal
M18 37 No
AWNIA0159ZZ
Revision: December 20092009 QX56

WCS-22
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KEY SWITCH SIGNAL CIRCUIT
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair harness or connector.
4.CHECK KEY SWITCH POWER SUPPLY CIRCUIT
Check voltage between key switch and ignition knob switch harness
connector and ground.
Is the inspection result normal?
YES >> Replace key switch and ignition knob switch.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000003776718
1.CHECK KEY SWITCH
1. Turn ignition switch OFF.
2. Disconnect key switch and ignition knob switch connector.
3. Check continuity between key switch and ignition knob switch terminals 3 and 4.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace key switch and ignition knob switch.
Te r m i n a l s Voltag e
(Approx.)
(+)
(−)
Key switch and ignition
knob switch connector Terminal
M12 3Ground Battery voltage
AWNIA0160ZZ
3 – 4
When key is inserted
into key cylinder : Continuity should exist.
When key is removed
from key cylinder : Continuity should not exist.
AWNIA0158ZZ
Revision: December 20092009 QX56

WCS
WARNING CHIME SYSTEMWCS-23
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WARNING CHIME SYSTEM
Wiring DiagramINFOID:0000000003776719
ABNWA0073GB
Revision: December 20092009 QX56

WCS-24
< COMPONENT DIAGNOSIS >
WARNING CHIME SYSTEM
ABNIA0213GB
Revision: December 20092009 QX56

WCS
WARNING CHIME SYSTEMWCS-25
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ABNIA0214GB
Revision: December 20092009 QX56

WCS-26
< COMPONENT DIAGNOSIS >
WARNING CHIME SYSTEM
ABNIA0215GB
Revision: December 20092009 QX56