BATTERY INFINITI QX56 2011 Factory Service Manual

SE-10
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SECOND SEAT POWER UNLOCK SYST EM : Component Parts Location
INFOID:0000000006217360
SECOND SEAT POWER UNLOCK SYSTEM : Component DescriptionINFOID:0000000006217361
THIRD SEAT SEATBACK POWER FOLDING SYSTEM
1. Power unlock motor RH 2. Power unlock relay RH 3. Second seat power unlock switch RH
4. Second seat power unlock switch LH 5. Power unlock motor LH 6. Power unlock relay LH
A. View with seat cushion pad and seat
back pad removed. B. View with seat cushion pad and seat
back pad removed.
JMJIA4221ZZ
Item Function
Second seat unlock switch supplies power supply to power unlock relay and operates power unlock system. Power unlock relay Supplies battery power supply to motor when receiving power supply from power unlock switch.
Power unlock motor Releases lock when receiving battery power supply from power unlock relay.
Revision: 2010 May2011 QX56

SE-12
< SYSTEM DESCRIPTION >
COMPONENT PARTS
FRONT HEATED SEAT SYSTEM
FRONT HEATED SEAT SYSTEM : Component Parts LocationINFOID:0000000006217364
FRONT HEATED SEAT SYSTEM : Component DescriptionINFOID:0000000006217365
Up relay 1/2Supplies battery power supply to motor when receiving power supply from fold down switch or re-
clining switch.
Down relay 1/2 Supplies battery power supply to motor when receiving power supply from fold down switch or re-
clining switch.
Item Function
JMJIA4223ZZ
1. Front heated seat switch (driver
side) 2. Front heated seat switch (passenger
side) 3. Seat back heater
4. Seat cushion heater
A. Front seat
Item Function
Front heated seat switch Supplies power supply to each heated seat and operates switching of HI/LO of heated
seat and ON/OFF of the system.
Seat cushion heater Built-in seat cushion, the heater operates with the power supplied by heater seat switch. Seat back heater Built-in seatback, the heater operates with the power supplied by heater seat switch.
Revision: 2010 May2011 QX56

SE-18
< SYSTEM DESCRIPTION >
SYSTEM
Malfunction Malfunctioning condition
The temperature difference between the seatback ther-
mal electric unit and seat cushion thermal electric unit is
more than 30 °C  When it detects for 4 seconds that the temperature difference between
the seatback thermal electric unit and seat cushion thermal electric unit
is more than 30 °, it stops the output to the thermal electric unit, activates
the climate controlled seat blower motor at the maximum position, and
sends the external airflow for 30 seconds
 If the temperature difference is still more than 30 °C after 30 seconds
pass, it stops all output and enters the system OFF condition
 When the temperature difference between seatback thermal electric unit and seat cushion thermal electric unit becomes less than 20 °C, the sys-
tem recovers automatically
 If it detects that the temperature difference is more than 30 °C after the
automatic system recovery, it immediately stops all output and enters the
system OFF condition
NOTE:
When the switch operation is performed before entering the system OFF
condition, the fail-safe mode is reset.
The temperature of thermal electric unit is more than
11 0 °C in the HEAT mode (any thermal electric unit in the
seatback or seat cushion)  When it detects for 4 seconds that the temperature of the thermal electric
unit is more than 110 °C, it stops the output to the thermal electric unit,
activates the climate controlled seat blower motor at the maximum posi-
tion, and sends the external airflow for 30 seconds
 If the temperature does not become less than 105 °C after 30 seconds
pass, it stops all output and enters the system OFF condition
 When the temperature of the thermal electric unit becomes less than 105 °C, the system recovers automatically
 If it detects that the temperature of the thermal electric unit is more than
11 0 °C after the automatic system recovery, it immediately stops all out-
put and enters the system OFF condition
The temperature of the thermal electric unit is more than
45 °C in the COOL mode (any thermal electric unit in the
seatback or seat cushion)  When it detects for 4 seconds that the temperature of the thermal electric
unit is more than 45 °C and less than 70 °C, it starts the temperature mon-
itoring of the thermal electric unit at 3 second intervals
 While monitoring, if it detects that the temperature continuously rises 2 °C
or more 4 times or reaches 70 °C or more, it stops all output and enters
the system OFF condition
 If it detects other results of monitoring, it continues activating in the COOL mode
Thermal electric unit sensor open circuit
(in either the back and the cushion TEU)  When it detects for 4 seconds that the thermal electric unit sensor is an
open circuit, it stops all output and enters the system OFF condition
Climate controlled seat blower motor system open circuit
(in either the back and the cushion blower)  When it detects for 2 seconds that climate controlled seat blower motor
is an open circuit while the climate controlled seat is being activated, and
the battery status has been stable for the same 2 second period. it stops
output to the thermal electric unit
 When it detects for 10 seconds that the climate controlled seat blower motor is an open circuit while the climate controlled seat is being activat-
ed, and the battery status has been stable for the same 10second period.
it stops all output and enters the system OFF condition
NOTE:
After detecting the climate seat blower motor system open circuit for 2
seconds, the system recovers automatically if the activation of the cli-
mate controlled seat blower motor is detected for 1 second or more.
Switch input out of the specified range
(either heat input or cool input)  When it detects for 4 seconds that the rotary switch input is less than
30% of the vehicle battery voltage, it stops all output and enters the sys-
tem OFF condition
 When the switch input returns to a value within the specified range, the system recovers automatically
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

SE-22
< ECU DIAGNOSIS INFORMATION >
CLIMATE CONTROLLED SEAT CONTROL UNIT
Malfunction Malfunctioning condition
The temperature difference between the seatback ther-
mal electric unit and seat cushion thermal electric unit is
more than 30 °C  When it detects for 4 seconds that the temperature difference between
the seatback thermal electric unit and seat cushion thermal electric unit
is more than 30 °, it stops the output to the thermal electric unit, activates
the climate controlled seat blower motor at the maximum position, and
sends the external airflow for 30 seconds
 If the temperature difference is still more than 30 °C after 30 seconds
pass, it stops all output and enters the system OFF condition
 When the temperature difference between seatback thermal electric unit and seat cushion thermal electric unit becomes less than 20 °C, the sys-
tem recovers automatically
 If it detects that the temperature difference is more than 30 °C after the
automatic system recovery, it immediately stops all output and enters the
system OFF condition
NOTE:
When the switch operation is performed before entering the system OFF
condition, the fail-safe mode is reset.
The temperature of thermal electric unit is more than
11 0 °C in the HEAT mode (any thermal electric unit in the
seatback or seat cushion)  When it detects for 4 seconds that the temperature of the thermal electric
unit is more than 110 °C, it stops the output to the thermal electric unit,
activates the climate controlled seat blower motor at the maximum posi-
tion, and sends the external airflow for 30 seconds
 If the temperature does not become less than 105 °C after 30 seconds
pass, it stops all output and enters the system OFF condition
 When the temperature of the thermal electric unit becomes less than 105 °C, the system recovers automatically
 If it detects that the temperature of the thermal electric unit is more than
11 0 °C after the automatic system recovery, it immediately stops all out-
put and enters the system OFF condition
The temperature of the thermal electric unit is more than
45 °C in the COOL mode (any thermal electric unit in the
seatback or seat cushion)  When it detects for 4 seconds that the temperature of the thermal electric
unit is more than 45 °C and less than 70 °C, it starts the temperature mon-
itoring of the thermal electric unit at 3 second intervals for increase in
temperature from the previous value
 While monitoring, if it detects that the temperature continuously rises 2 °C
or more for 4 consecutive intervals or reaches 70 °C or more, it stops all
output and enters the system OFF condition
 If it detects other results of monitoring, it continues activating in the se-
lected COOL mode
Thermal electric unit sensor open circuit
(in either the back and the cushion TEU)  When it detects for 4 seconds that the thermal electric unit sensor is an
open circuit, it stops all output and enters the system OFF condition
Climate controlled seat blower motor system open circuit
(in either the back and the cushion blower)  When it detects for 2 seconds that climate controlled seat blower motor
is an open circuit while the climate controlled seat is being activated, and
the battery status has been stable for the same 2 second period, it stops
output to the thermal electric unit
 When it detects for 10 seconds that the climate controlled seat blower motor is an open circuit while the climate controlled seat is being activat-
ed, and the battery status has been stable for the same 10second period,
it stops all output and enters the system OFF condition
NOTE:
After detecting the climate seat blower motor system open circuit for 2
seconds, the system recovers automatically if the activation of the cli-
mate controlled seat blower motor is detected for 1 second or more.
Switch input out of the specified range
(either heat input or cool input)  When it detects for 4 seconds that the rotary switch input is less than
30% of the vehicle battery voltage, it stops all output and enters the sys-
tem OFF condition
 When the switch input returns to a value within the specified range, the
system recovers automatically
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