Climate Controlled Seat Control Unit: Fail-safe

Malfunction

Malfunctioning condition

The temperature difference between the seatback thermal electric device and seat cushion thermal electric device is 30 deg.C (86 deg.F) or more

• When it detects for 4 seconds that the temperature difference between the seatback thermal electric device and seat cushion thermal electric device is 30 deg.C (86 deg.F) or more, stops the output to the thermal electric device, activates the climate controlled seat blower motor in the maximum position, and sends the external airflow for 30 seconds.
• If the temperature difference is still 30 deg.C (86 deg.F) or more after 30 seconds pass, it stops all output and enters the system OFF condition.
• When the temperature difference between seatback thermal electric device and seat cushion thermal electric device becomes 20 deg.C (68 deg.F) or less, the system recovers automatically.
• If it detects that the temperature difference is 30 deg.C (86 deg.F) or more 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 device is 110 deg.C (230 deg.F) or more in the HEAT mode (any thermal electric device in the seatback or seat cushion)

• When it detects for 4 seconds that the temperature of the thermal electric device is 110 deg.C (230 deg.F) or more, stops the output to the thermal electric device, activates the climate controlled seat blower motor in the maximum position, and sends the external airflow for 30 seconds.
• If the temperature does not become 105 deg.C (221 deg.F) or less after 30 seconds pass, it stops all output and enters the system OFF condition.
• When the temperature of the thermal electric device becomes 105 deg.C (221 deg.F) or less, the system recovers automatically.
• If it detects that the temperature of the thermal electric device is 110 deg.C (230 deg.F) or more after the automatic system recovery, it immediately stops all output and enters the system OFF condition.

The temperature of the thermal electric device is 45 deg.C (113 deg.F) or more in the COOL mode (any thermal electric device in the seatback or seat cushion)

• When it detects for 4 seconds that the temperature of the thermal electric device is between 45 deg.C (113 deg.F) and 70 deg.C (158 deg.F), it starts the temperature monitoring of the thermal electric device at 3 second intervals.
• While monitoring, if it detects that the temperature raises 2 deg.C (36 deg.F) or more 4 times continuously or reaches 70 deg.C (158 deg.F) 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 device sensor system open circuit

• When it detects for 4 seconds that the thermal electric device sensor system is an open circuit.

Climate controlled seat blower motor system open circuit

• When it detects for 2 seconds that climate controlled seat blower motor system is an open circuit while the climate controlled seat is being activated, it stops output to the thermal electric device.
• When it detects for 10 seconds that the climate controlled seat blower motor system is an open circuit while the climate controlled seat is being activated, 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 climate controlled seat blower motor is detected for 1 second or more.

Switch input out of the specified range

• When it detects for 4 seconds that the rotary switch input is 30% 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.

HEAT or COOL switch input out of the specified range

• When it detects for 4 seconds that 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

• System voltage* of the climate controlled seat control unit is out of the operation range (8.5 V - 16.5 V).