Infiniti QX56 (Z62). Manual

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

• 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 for increase in
temperature from the previous value

• While monitoring, if it detects that the temperature continuously rises 2

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

CLIMATE CONTROLLED SEAT CONTROL UNIT

SE-23

< ECU DIAGNOSIS INFORMATION >

*: 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 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

Infiniti QX56 (Z62). Manual - part 1121