Infiniti QX56 (Z62). Manual - part 1120

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 
110

°

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 

110

°

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

SYSTEM

SE-19

< SYSTEM DESCRIPTION >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

*: 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 ignition is turned
ON, the system shall return to the standby mode. If the system enters 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

SE-20

< ECU DIAGNOSIS INFORMATION >

CLIMATE CONTROLLED SEAT CONTROL UNIT

ECU DIAGNOSIS INFORMATION

CLIMATE CONTROLLED SEAT CONTROL UNIT

Reference Value

INFOID:0000000006217379

TERMINAL LAYOUT

PHYSICAL VALUES

JMJIA3944ZZ

Terminal No.

(Wire color)

Description

Condition

Voltage (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

Output

Climate controlled seat switch

HEAT or COOL

12

Other than the above

 0

CLIMATE CONTROLLED SEAT CONTROL UNIT

SE-21

< ECU DIAGNOSIS INFORMATION >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

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-safe

INFOID: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

Output

Climate 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

Condition

Voltage (V)

(Approx.)

+

–

Signal name

Input/

Output