ignition INFINITI QX56 2011 Factory Service Manual

SE-4
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006237842
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
 When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly
causing serious injury.
 When using air or electric power tools or hammers , always switch the ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Service NoticeINFOID:0000000006217352
 When removing or installing various parts, place a cloth or padding onto the vehicle body to prevent
scratches.
 Handle trim, molding, instruments, grille, etc. carefull y during removing or installing. Be careful not to oil or
damage them.
 Apply sealing compound where necessary when installing parts.
 When applying sealing compound, be careful that t he sealing compound never protrudes from parts.
 When replacing any metal parts (for example body outer panel, members, etc.), always take rust prevention
measures.
Precaution for WorkINFOID:0000000006217353
 When removing or disassembling each component, be careful not to damage or deform it. If a component
may be subject to interference, al ways protect it with a shop cloth.
 When removing (disengaging) components with a screwdriver or similar tool, always wrap the component
with a shop cloth or vinyl tape to protect it.
 Protect the removed parts with a shop cloth and keep them.
 Replace a deformed or damaged clip.
 If a part is specified as a non-reusable part, always replace it with new one.
 Always tighten bolts and nuts securely to the specified torque.
 After reinstallation is complete, always check that each part works normally.
 Follow the steps below to clean components.
- Water soluble foul: Dip a soft cloth into lukewarm water, and wring the water out of the cloth to wipe the fouled area.
Then rub with a soft and dry cloth.
Revision: 2010 May2011 QX56

SE-16
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
POWER SEAT SYSTEM
POWER SEAT SYSTEM : System DescriptionINFOID:0000000006217370
Power seat switch can be operated regardless of the ignition switch position, because power supply is always
supplied to power seat switch.
SLIDING OPERATION
While operating the sliding switch located in power s eat switch, sliding motor operates and makes possible the
seat front and back position adjustment.
RECLINING OPERATION
While operating the reclining switch located in power seat switch, reclining motor operates and makes possi-
ble the seat back forward and backward position adjustment.
LIFTING OPERATION
While operating the lifting switch located in power seat switch, lifting motor operates and makes possible the
seat cushion up and down position adjustment.
LUMBAR SUPPORT SYSTEM
LUMBAR SUPPORT SYSTEM : System DescriptionINFOID:0000000006217371
 Lumbar support switch can be operated regardless of t he ignition switch position, because power supply is
always supplied to lumbar support switch.
 While operating the lumbar support switch, lumbar support motor operates which allows forward and back-
ward operation of seatback support.
SECOND SEAT POWER UNLOCK SYSTEM
SECOND SEAT POWER UNLOCK SY STEM : System DescriptionINFOID:0000000006217372
 Second seat power unlock switch can be operated regardl ess of the ignition switch position, because power
supply is always supplied to second seat power unlock switch and power unlock relay.
 Power unlock motor pulls seatback control wire, s eatback folds down, seat lock unlocks, and second seat
tilts up, when second seat power unlock switch is pressed.
THIRD SEAT SEATBACK POWER FOLDING SYSTEM
THIRD SEAT SEATBACK POWER FOLDIN G SYSTEM : System Description
INFOID:0000000006217373
 Third seat fold down switch and third seat reclini ng switch can be operated regardless of the ignition switch
position, because power supply is always supplied to thir d seat fold down switch, third seat reclining switch
and relays.
 Power folding motor operates and seatback reclining and third seat folding can be performed while third seat
fold down switch and third seat reclining switch are operated.
FRONT HEATED SEAT SYSTEM
FRONT HEATED SEAT SYSTEM : System DescriptionINFOID:0000000006217374
Heated seat is a system that operates when ignition switch is in ON position.
HEATER OPERATION
 While operating the heated seat switch, seat cushion heater and seat back heater operate.
 Temperature of seat can be adjust ed by operating on heated seat switch.
SECOND HEATED SEAT SYSTEM
SECOND HEATED SEAT SYSTEM : System DescriptionINFOID:0000000006217375
Heated seat is a system that operates when ignition switch is in ON position.
HEATER OPERATION
 While operating the heated seat switch, seat cushion heater and seat back heater operate.
Revision: 2010 May2011 QX56

SYSTEMSE-19
< SYSTEM DESCRIPTION >
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*: System voltage is the voltage between the climate controlled seat control unit power source and ground.
NOTE:
When the ignition status changes to OFF during the fail-safe mode, the control unit shall enter the OFF condition. If the ignit ion is turned
ON, the system shall return to the standby mode. If the system en ters in the fail-safe mode again after performing ignition cycle, start the
diagnosis. HEAT or COOL switch input out of the specified range
 During the standby mode, heating or cooling states, if the rotary switch
input is 6% or less of the vehicle battery voltage, it stops all output and
enters the system OFF condition
 When the switch input returns to a value within the specified range, the system recovers automatically
System voltage out of range  If the system voltage at the climate controlled seat control unit falls out-
side of the 8.5 to 16.5 V operating range, it stops all output after a 500ms
time period.
 When the system voltage returns to the normal operating range (10.5-
15.5V with a 500ms hysteresis), the system recovers automatically.
Malfunction Malfunctioning condition
Revision: 2010 May2011 QX56

SE-20
< ECU DIAGNOSIS INFORMATION >
CLIMATE CONTROLLED SEAT CONTROL UNIT
ECU DIAGNOSIS INFORMATION
CLIMATE CONTROLLED SEAT CONTROL UNIT
Reference ValueINFOID:0000000006217379
TERMINAL LAYOUT
PHYSICAL VALUES
JMJIA3944ZZ
Te r m i n a l N o .(Wire color) Description
ConditionVoltage (V)
(Approx.)
+ – Signal name Input/
Output
43 (-) Ground Ground — — 0
52 (-) Ground
Climate controlled seat
switch power supply Output Ignition switch ON 12
53 (-) Ground Ignition switch power supply Input Ignition switch ON Battery voltage
54 (-) Ground COOL switch signal Input Climate controlled seat switch HI COOL 2.6 - 4.2
MID COOL 1.6 - 2.5 LO COOL 0.8 - 1.5 OFF 0
55 (-) Ground HEAT switch signal Input Climate controlled seat switch HI HEAT 2.6 - 4.2
MID HEAT 1.6 - 2.5 LO HEAT 0.8 - 1.5 OFF 0
56 (-) Ground COOL switch indicator signal Output Climate controlled seat switch COOL 12
OFF 0
57 (-) Ground HEAT switch indicator signal Output Climate controlled seat switch HEAT 12
OFF 0
58 (-) Ground
Seatback thermal electric
unit HEAT signal Output Climate controlled seat switch HEAT or COOL 0 - 12*
OFF 0
59 (-) Ground
Seatback thermal electric
unit COOL signal Output Climate controlled seat switch HEAT or COOL 0 - 12*
OFF 0
60 (-) Ground Seatback thermal electric
unit sensor ground
— Ignition switch ON 0
61 (-) Ground
Seatback thermal
electric unit sensor signal Input Climate controlled seat operated 1 - 5
62 (-) Ground Seatback blower motor pow-
er supply
OutputClimate controlled seat switch HEAT or COOL 12
Other than the above 0
Revision: 2010 May2011 QX56

CLIMATE CONTROLLED SEAT CONTROL UNITSE-21
< ECU DIAGNOSIS INFORMATION >
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O P*:It changes between 12 and 0 V
NOTE:
 Measure the value on the condition that the battery voltage is 14 V
 Wait 1 minute or more after thermal electric unit is activated, and then start the measurement
Fail-safeINFOID:0000000006217380
 Climate controlled seat control unit equips fail-safe function.
 When a malfunction occurs in the systems shown below , climate controlled seat control unit stops output.
63
(-) Ground Seatback blower motor
speed control signal Output Climate controlled seat switch HEAT 5.5 - 8
HI COOL 11.2
MID COOL 8
LO COOL 6.5
64 (-) Ground Blower motor ground — — 0
67 (-) Ground Seat cushion thermal electric
unit HEAT signal
Output Climate controlled seat switch HEAT or COOL 0 - 12*
OFF 0
68 (-) Ground Seat cushion thermal electric
unit COOL signal
Output Climate controlled seat switch HEAT or COOL 0 - 12*
OFF 0
69 (-) Ground Seat cushion thermal electric
unit sensor ground — Ignition switch ON 0
70 (-) Ground Seat cushion thermal electric
unit sensor signal
Input Climate controlled seat operated 1 - 5
71 (-) Ground Seat cushion blower motor
power supply OutputClimate controlled seat switch HEAT or COOL 12
Other than the above 0
72 (-) Ground seat cushion blower motor
speed control signal Output Climate controlled seat switch HEAT 5.5 - 8
HI COOL 9.2
MID COOL 8
LO COOL 6.5
74 (-) Ground Ignition switch power supply Input Ignition switch ON Battery voltage
Terminal No.
(Wire color) Description
ConditionVoltage (V)
(Approx.)
+ – Signal name Input/
Output
Revision: 2010 May2011 QX56

CLIMATE CONTROLLED SEAT CONTROL UNITSE-23
< ECU DIAGNOSIS INFORMATION >
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*: System voltage is the voltage between the climate controlled seat control unit power source and ground.
NOTE:
When the ignition status changes to OFF during the fail-safe mode, the control unit shall enter the OFF condition. If the ignit ion is turned
ON, the system shall return to the standby mode. If the system en ters in the fail-safe mode again after performing ignition cycle, start the
diagnosis. HEAT or COOL switch input out of the specified range
 During the standby mode, heating or cooling states, if the rotary switch
input is less than 6% of the vehicle battery voltage, it stops all output and
enters the system OFF condition
 When the switch input returns to a value within the specified range, the system recovers automatically
System voltage out of range  If the system voltage at the climate controlled seat control unit falls out-
side of the 8.5 to 16.5 V operating range, it stops all output after a 500ms
time period.
 When the system voltage returns to the normal operating range (10.5-
15.5V with a 500ms hysteresis), the system recovers automatically.
Malfunction Malfunctioning condition
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITSE-67
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
CLIMATE CONTROLLED SEAT CONTROL UNIT
CLIMATE CONTROLLED SEAT CONT ROL UNIT : Diagnosis ProcedureINFOID:0000000006217389
Driver side
1.CHECK FUSE
Check that the following fuses are not fusing.
Is the fuse fusing?
YES >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
NO >> GO TO 2.
2.CHECK CLIMATE CONTROLLED SEAT CONTRO L UNIT (DRIVER SIDE) POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat control unit (driver side) connector.
3. Turn ignition switch ON.
4. Check voltage between climate controlled seat c ontrol unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 3.
3.CHECK CLIMATE CONTROLLED SEAT CONTROL UNI T (DRIVER SIDE) POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat relay.
3. Check continuity between climate controlled seat control unit (driver side) harness connector and climate
controlled seat relay harness connector.
4. Check continuity between climate controlled seat control unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connector.
Signal name Fuse No.
Battery power supply 82(15A) IGN power supply 3 (10A)
(+) (− ) Voltage (V)
(Approx.)
Climate controlled seat co
ntrol unit (driver side)
Connector Terminal B508 53 Ground Battery voltage
B509 74
Climate controlled seat control unit (dri ver side) Climate controlled seat relay
Continuity
Connector Terminal Connector Terminal
B508 53 E18 6 Existed
B509 74
Climate controlled seat co ntrol unit (driver side)
GroundContinuity
Connector Terminal
B508 53 Not existed
B509 74
Revision: 2010 May2011 QX56

SE-68
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
4.CHECK CILMATE CONTROLLED SEAT RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between climate controlled seat relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness or connector.
5.CHECK CLIMATE CONTROLLED SEAT RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between climate cont rolled seat relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness.
6.CHECK CLIMATE CONTROLLED SEAT RELAY
Check climate controlled seat relay.
Refer to SE-70, "
CLIMATE CONTROLLED SEAT CONTROL UNIT : Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace climate controlled seat relay.
7.CHECK CLIMATE CONTROLLED SEAT CONTRO L UNIT (DRIVER SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between climate contro l unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace harness or connector.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Passenger side
1.CHECK FUSE
Check that the following fuses are not fusing.
(+)
(− ) Voltage (V)
(Approx.)
Climate controled seat relay
Connector Terminal
E18 2
Ground Battery voltage
7
Climate controlled seat relay
GroundContinuity
Connector Terminal
E18 1 Existed
Climate controlled seat co ntrol unit (driver side)
GroundContinuity
Connector Terminal
B509 43 Existed
Revision: 2010 May2011 QX56

POWER SUPPLY AND GROUND CIRCUITSE-69
< DTC/CIRCUIT DIAGNOSIS >
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Is the fuse fusing?
YES >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
NO >> GO TO 2.
2.CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT (PASSENGER SIDE) POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat c ontrol unit (passenger side) connector.
3. Turn ignition switch ON.
4. Check voltage between climate controlled seat control unit (passenger side) harness connector and
ground.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 3.
3.CHECK CLIMATE CONTROLLED SEAT CONTROL UNI T (PASSENGER SIDE) POWER SUPPLY CIR-
CUIT
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat relay.
3. Check continuity between climate controlled seat control unit (passenger side) harness connector and cli-
mate controlled seat relay harness connector.
4. Check continuity between climate controlled seat control unit (passenger side) harness connector and
ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connector.
4.CHECK CILMATE CONTROLLED SEAT RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between climate controll ed seat relay harness connector and ground.
Signal name Fuse No.
Battery power supply 81 (15A) IGN power supply 3 (10A)
(+) (− ) Voltage (V)
(Approx.)
Climate controlled seat control unit (passenger side)
Connector TerminalB518 53 Ground Battery voltage
B519 74
Climate controlled seat control unit (passenger side) Climate controlled seat relay Continuity
Connector Terminal Connector Terminal
B518 53 E18 3 Existed
B519 74
Climate controlled seat control unit (passenger side)
GroundContinuity
Connector Terminal
B518 53 Not existed
B519 74
Revision: 2010 May2011 QX56

SE-70
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness or connector.
5.CHECK CLIMATE CONTROLLED SEAT RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between climate cont rolled seat relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness.
6.CHECK CLIMATE CONTROLLED SEAT RELAY
Check climate controlled seat relay.
Refer to SE-70, "
CLIMATE CONTROLLED SEAT CONTROL UNIT : Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace climate controlled seat relay.
7.CHECK CLIMATE CONTROLLED SEAT CONTRO L UNIT (PASSENGER SIDE) GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between harness connector and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair harness or connector.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
CLIMATE CONTROLLED SEAT CONTRO L UNIT : Component InspectionINFOID:0000000006217390
1.CHECK CLIMATE CONTROLLED SEAT RELAY
1. Turn ignition switch OFF.
2. Remove climate controlled seat relay.
(+)
(− ) Voltage (V)
(Approx.)
Climate controlled seat relay
Connector Terminal
E18 2
Ground Battery voltage
5
Climate controlled seat relay
GroundContinuity
Connector Terminal
E18 1 Existed
Climate controlled seat control unit (passenger side) GroundContinuity
Connector Terminal
B519 43 Existed
Revision: 2010 May2011 QX56