2011 INFINITI QX56 ignition

CLIMATE CONTROLLED SEAT CONTROL UNITSE-21
< ECU DIAGNOSIS INFORMATION >
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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

SE-72
< DTC/CIRCUIT DIAGNOSIS >
CLIMATE CONTROLLED SEAT SWITCH
CLIMATE CONTROLLED SEAT SWITCH
Component Function CheckINFOID:0000000006217391
1.CHECK CLIMATE CONTROLLED SEAT SWITCH FUNCTION
Check that climate controlled seat activates when operating climate controlled seat control switch.
Is the inspection result normal?
YES >> Climate controlled seat switch is OK.
NO >> Refer to SE-72, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006217392
1.CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between climate controlled seat control unit harness connector and ground.
Is the inspection result normal?
YES >> Climate controlled seat switch circuit is OK.
NO-1 HEAT or COOL mode is NG>>GO TO 2.
NO-2 HEAT and COOL modes are NG>>GO TO 3.
2.CHECK CLIMATE CONTROLLED SEAT SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat switch connecto r and climate controlled seat control unit connector.
3. Check continuity between climate controlled seat switch harness connector and climate controlled seat
control unit harness connector.
(+)
(–) Condition Voltage (V)
(Approx.)
Climate controlled seat control unit
Connector Terminal
Driver side B508 54
Ground Climate controlled seat
switch (driver side)
COOL
HI 2.6 - 4.2
MID 1.6 - 2.5
LO 0.8 - 1.5
OFF 0
55 HEATHI 2.6 - 4.2
MID 1.6 - 2.5
LO 0.8 - 1.5
OFF 0
Passenger side B518 54
Climate controlled seat
switch (passenger seat) COOL
HI 2.6 - 4.2
MID 1.6 - 2.5
LO 0.8 - 1.5
OFF 0
55 HEATHI 2.6 - 4.2
MID 1.6 - 2.5
LO 0.8 - 1.5
OFF 0
Revision: 2010 May2011 QX56

CLIMATE CONTROLLED SEAT SWITCHSE-73
< DTC/CIRCUIT DIAGNOSIS >
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4. Check continuity between climate contro lled seat switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness.
3.CHECK CLIMATE CONTROLLED SEAT SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat switch connector.
3. Turn ignition switch ON.
4. Check voltage between climate controll ed seat switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK CLIMATE CONTROLLED SEAT SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat control unit connector.
3. Check continuity between climate controlled seat switch harness connector and climate controlled seat
control unit harness connector.
4. Check continuity between climate contro lled seat switch harness connector and ground.
Is the inspection result normal?
Climate controlled seat switch Climate cotrolled seat control unit Continuity
Connector Terminal Connector Terminal
Driver side COOL
M38 2
B508 54
Existed
HEAT 3 55
Passenger side COOL
M39 2
B518 54
HEAT 3 55
Climate controlled seat switch
GroundContinuity
Connector Terminal
Driver side COOL
M382
Not existed
HEAT 3
Passenger side COOL
M392
HEAT 3
(+) (–)Voltage (V)
(Approx.)
Climate controlled seat switch
Connector Terminal
Driver side M38 1Ground12
Passenger side M39
Climate controlled seat switch Climate cotrolled seat control unit Continuity
Connector Terminal Connector Terminal
Driver side M38 1B508
52 Existed
Passenger side M39 B518
Climate controlled seat switch
GroundContinuity
Connector Terminal
Driver side M38 1 Not existed
Passenger side M39
Revision: 2010 May2011 QX56