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
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A
B
SE
N
O
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*: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
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