2011 INFINITI QX56 fuse

SBC-52
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006237930
1.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect pre-crash seat belt control unit (driver side and passenger side) harness connector.
3. Check continuity between pre-crash seat belt c ontrol unit (driver side and passenger side) harness con-
nector and ground.
Is the measurement value normal?
YES >> GO TO 2.
NO >> Repair or replace harness or connector.
2.CHECK POWER SUPPLY CIRCUIT-I
Check voltage between pre-crash seat belt control unit (driver side and passenger side) harness connector
and ground.
Is the measurement value normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.CHECKPOWER SUPPLY CIRCUIT-II
1. Disconnect fuse block (J/B) harness connector.
2. Check continuity between pre-crash seat belt c ontrol unit (driver side and passenger side) harness con-
nector and fuse block (J/B) harness connector.
3. Check continuity between pre-crash seat belt c ontrol unit (driver side and passenger side) harness con-
nector and ground.
Is the measurement value normal?
YES >> Check 10 A fuse (No. 6).
NO >> Repair or replace harness or connector.
Pre-crash seat belt control unit GroundContinuity
Connector Terminal
B9 (Driver side) 18
Existed
20
B231 (Passenger side) 18
20
Pre-crash seat belt control unit
GroundVo l ta g e
(Approx.)
Connector Terminal
B9 (Driver side) 1 Battery voltage
B231 (Passenger side)
Pre-crash seat belt control unit Fuse block (J/B) Continuity
Connector Terminal Connector Terminal
B9 (Driver side) 1 M2 6B Existed
B231 (Passenger side)
Pre-crash seat belt control unit GroundContinuity
Connector Terminal
B9 (Driver side) 1 Not existed
B231 (Passenger side)
Revision: 2010 May2011 QX56

SCS-76
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
C1803 AIR SUSPENSION EXH SOL
2. Insert resin stick (A) 4.7 mm (0
.185 in) in diameter into either
one of the air compressor air tube holes to prevent leakage of
air.
3. Insert resin pipe (B) 4.7 mm (0.185 in) in diameter into the other
air tube hole and install air gauge (C) on the tip of the pipe.
4. Apply 12 V between air compressor connector terminal 1 and 2
until the air gauge reading reaches approximately 500 mm Hg
(0.67 MPa).
CAUTION:
 Never make the terminals short.
 Connect the fuse between th e terminals when applying
the voltage.
5. Apply 12 V between air compressor connector te rminal 3 and 4 for approximately 2 seconds.
CAUTION:
 Never make the terminals short.
 Connect the fuse between the termina ls when applying the voltage.
*: It takes approximately 2 minutes for the air gauge needle to stop moving.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace the air compressor. Refer to SCS-95, "
Removal and Installation".
JSEIA0248ZZ
(+) (fuse) (−)
Condition Status
Air compressor
Te r m i n a l
12 Apply 12 V between air compressor connector terminal 1 and 2
until the air gauge reading reaches approximately 500 mm Hg
(0.67 MPa). Air gauge needle remains at
the pressurized position.
(+) (fuse) (
−)
Condition Status
Air compressor
Te r m i n a l
43 Apply 12 V between air compressor connector terminal 3 and 4
for approximately 2 seconds. Air gauge reading lowers and
the needle stops moving.
Revision: 2010 May2011 QX56

C1804 VHCL HEIGHT ADJ UPSCS-77
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
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K L
M A
B
SCS
N
O P
C1804 VHCL HEIGHT ADJ UP
DTC LogicINFOID:0000000006256070
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Set vehicle in the unloaded vehicle status.
2. Start the engine and wait 150 seconds or more.
3. Perform “Self Diagnostic Result” in “E-SUS”.
Is
“C1804” detected ?
YES >> Go to SCS-77, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256071
1.CHECK APPEARANCE
Visually check for malfunction of suspension component s, damage of air chamber of rear shock absorber,
installation malfunction, or defo rmation of vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK AIR LEAK
Apply soapy water to air tube, connecting portions between air tube and each component, and air chamber of
rear shock absorber. Check for air leakage.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repaire or replace damaged parts.
3.CHECK AIR COMPRESSOR RELAY POWER SUPPLY
1. Turn ignition switch OFF.
2. Check 30A fuse (#I).
3. Disconnect air compressor relay connector.
4. Check voltage between air compressor relay harness connector and ground.
DTC Display item Malfunction detected condition Possible cause
C1804 VHCL HEIGHT ADJ UP The vehicle height is 15 mm (0.59 in) or more lower
than the reference height despite the output of air
compressor ON signal continuously for 120 seconds
by the air levelizer control module.  Harness or connector
Air compressor
 Air compressor relay
 Air levelizer control module
 Rear shock absorber (air cham-
ber)
 Vehicle height sensor
 Air tube
 Rear suspension component parts
 Overloaded
Revision: 2010 May2011 QX56

C1804 VHCL HEIGHT ADJ UPSCS-79
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
I
J
K L
M A
B
SCS
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O P
NO >> Repair or replace damaged part.
Component Inspection (A ir Compressor Relay)INFOID:0000000006256072
1.CHECK AIR COMPRESSOR RELAY
1. Remove the air compressor relay. Refer to SCS-50, "
Component Parts Location".
2. Apply 12 V direct current between air compressor relay terminals 1 and 2. CAUTION:
 Never make the terminals short.
 Connect the fuse between the term inals when applying the voltage.
3. Check continuity between air compressor relay terminals 3 and 5.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace the air compressor relay. Refer to SCS-50, "
Component Parts Location".
Component Inspection (Air Compressor)INFOID:0000000006256073
CAUTION:
Keep the inside of air compressor free of dust.
1.CHECK AIR COMPRESSOR
1. Remove the air compressor. Refer to SCS-95, "
Removal and Installation".
2. Apply 12 V direct current between air compressor terminals 1 and 2. CAUTION:
 Never make the terminals short.
 Connect the fuse between the term inals when applying the voltage.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace the air compressor. Refer to SCS-95, "
Removal and Installation".
(+) (fuse) (−)
Condition Continuity
Air compressor relay
Te r m i n a l
2 1 Apply 12 V direct current between terminals 2 and 1. Existed
— — Does not apply 12 V direct current between terminals 2 and 1. Not existed
(+) (fuse) ( −)
Condition Status
Air compressor
Te r m i n a l
1 2 Apply 12 V direct current between terminals 1 and 2. Air flows from air exhaust holes.
Revision: 2010 May2011 QX56

SCS-84
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
C1808 AIR SUS COMPRS FNCTN
C1808 AIR SUS COMPRS FNCTN
DTC LogicINFOID:0000000006256080
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Set vehicle in the unloaded vehicle status.
2. Start the engine and wait 5 minutes or more.
3. Perform “Self Diagnostic Result” in “E-SUS”.
Is
“C1808” detected ?
YES >> Go to SCS-84, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256081
1.CHECK APPEARANCE
Visually check for malfunction of suspension component s, damage of air chamber of rear shock absorber,
installation malfunction, or deformation of vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK AIR LEAK
Apply soapy water to air tube, connecting portions between air tube and each component, and air chamber of
rear shock absorber. Check for air leakage.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repaire or replace damaged parts.
3.CHECK AIR COMPRESSOR RELAY POWER SUPPLY
1. Turn ignition switch OFF.
2. Check 30A fuse (#I).
3. Disconnect air compressor relay connector.
4. Check voltage between air compressor relay harness connector and ground.
DTC Display item Malfunction detected condition Possible cause
C1808 AIR SUS COMPRS FNCTN The cumulative operating time of the air compressor
reaches 180 seconds or more.
NOTE:
Cumulative time is cleared under the following condi-
tions:
 Ignition switch: OFF
 Exhaust conditions: satisfied [Vehicle height re-
mains 15 mm (0.59 in) or more higher than the ref-
erence height for 30 seconds.]  Harness or connector
 Vehicle height sensor
 Air compressor (exhaust sole-
noid)
 Air compressor relay
 Overloaded
 Rear shock absorber (air cham- ber)
 Rear suspension component parts
 Air tube
Revision: 2010 May2011 QX56

VEHICLE HEIGHT CANNOT BE RAISEDSCS-91
< SYMPTOM DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G H
I
J
K L
M A
B
SCS
N
O P
SYMPTOM DIAGNOSIS
VEHICLE HEIGHT CANNOT BE RAISED
DescriptionINFOID:0000000006256092
Vehicle height remains in low status.
Diagnosis ProcedureINFOID:0000000006256093
1.CHECK APPEARANCE
Visually check for fuse, malfunction of suspension components, installation malfunction, or deformation of
vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.PERFORM SELF-DIAGNOSIS
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” in “E-SUS”.
Are any DTC detected?
YES >> Refer to SCS-59, "DTC Index".
NO >> GO TO 3.
3.PERFORM STANDARD VEHICLE HEIGHT SETTING
Refer to SCS-67, "
Work Procedure".
Is the symptom improved?
YES >> INSPECTION END
NO >> Replace the air levelizer control module. Refer to SCS-94, "
Removal and Installation".
Revision: 2010 May2011 QX56

SCS-92
< SYMPTOM DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
VEHICLE HEIGHT CANNOT BE LOWERED
VEHICLE HEIGHT CANNOT BE LOWERED
DescriptionINFOID:0000000006256094
Vehicle height remains in high status.
Diagnosis ProcedureINFOID:0000000006256095
1.CHECK APPEARANCE
Visually check for fuse, malfunction of suspension components, installation malfunction, or deformation of
vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.PERFORM SELF-DIAGNOSIS
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” in “E-SUS”.
Are any DTC detected?
YES >> Refer to SCS-59, "DTC Index".
NO >> GO TO 3.
3.PERFORM STANDARD VEHICLE HEIGHT SETTING
Refer to SCS-67, "
Work Procedure".
Is the symptom improved?
YES >> INSPECTION END
NO >> Replace the air levelizer control module. Refer to SCS-94, "
Removal and Installation".
Revision: 2010 May2011 QX56

SE-14
< SYSTEM DESCRIPTION >
COMPONENT PARTS
CLIMATE CONTROLLED SEAT SYSTEM : Component Parts Location
INFOID:0000000006217368
CLIMATE CONTROLLED SEAT SYSTEM : Component DescriptionINFOID:0000000006217369
1. Climate controlled seat switch 2. Climate controlled seat relay 3. Seat cushion thermal electric unit
4. Climate controlled seat cushion
brower motor 5. Climate controlled seat control unit 6. Climate controlled seatback brower
motor
7. Seatback thermal electric unit
A. Engine room fuse, fusible link and re- lay box B. Back side of seat cushion. C. View with seatback board removed.
JMJIA3816ZZ
Item Function
Climate controlled seat relay Supplies power to the climate controlled seat control unit in accordance with the key switch
position that is ON or START
Climate controlled seat control unit Installed in the seat cushion backside and controls the seat cushion blower motor, seatback
blower motor, seatback thermal electric unit, and seat cushion thermal electric unit in accor-
dance with the input signal.
Climate controlled seat switch Installed in the center console and transmits signals to climate controlled seat control unit in
accordance with the HEAT (heated airflow) or COOL (cooled airflow) switch operation and the
temperature switch operation
Revision: 2010 May2011 QX56