CLIMATE CONTROL SEAT SYSTEM


  1. GENERAL


    1. This system effects the controls listed below:

      Control Outline
      Normal Control Normal control is conducted when the climate control seat switch is turned to COOL or HOT with the engine switch turned to ON (IG).
      Power ON Full-power Control Power ON full-power control is conducted when the climate control seat switch is turned to any HOT mode or MAX COOL with the engine switch turned ON (IG).
      Fail-safe If the climate control seat system malfunctions, the system stops its function.
      Self-diagnosis If the climate control seat system malfunctions, a DTC (Diagnostic Trouble Code) is stored in the climate control seat ECU.

  2. NORMAL CONTROL


    1. This system operates the climate control fan motor located underneath the seat to provide airflow to the seat cushion and seatback. The airflow is warmed or cooled by the Peltier element in the climate controller. The air that flows to the seat surface is distributed by moving along the grooves on the seat pad surface. This air is then moves through the slab urethane foam and seat cover.

      A01W7XTC01

      The Peltier element unit warms or cools the airflow.
      *1 Climate Controller *2 Seat Pad
      *3 Slab Urethane Foam *4 Seat Cover
      *a The Peltier element unit warms or cools the airflow. *b The airflow moves through the grooves on the seat pad surface and passes through the seat cover.
      *c Cover Composition - -

  3. POWER ON FULL-POWER CONTROL


    1. General


      1. This control outputs maximum voltage to the climate controller and the climate control fan motor when power is turned ON.

      2. MAX COOL control is conducted when the climate control seat switch is turned to MAX COOL with the engine switch turned ON (IG).

      3. MAX HOT control is conducted when the climate control seat switch is turned to MAX HOT, MID HOT or MIN HOT with the engine switch turned ON (IG). When the seat temperature reaches the set temperature, the seat heater turns OFF and then the climate controller maintains the seat temperatures.

    2. MAX COOL Control


      1. MAX COOL control is conducted under the following conditions:


        • The engine switch is turned ON (IG).

        • After the climate control seat switch has been turned ON, and the switch volume has been turned to MAX COOL.

        • Full-power control is performed for approximately 15 minutes.

        • Any climate controller temperature sensor detects 0°C or more.

          A01W7BYE02

    3. MAX HOT Control


      1. MAX HOT control is conducted under the following conditions:


        • The engine switch is turned ON (IG).

        • After the climate control seat switch has been turned ON, and the switch volume has been turned to MAX HOT, MID HOT or MIN HOT.

        • When the seat reaches the set temperature, switching the heater ON/OFF keeps the seat temperature.

        • TED operates after approximately 10 seconds.

        • When the TED over-heat temperature is detected, the output voltage is decreased and the FAN begins to operate. Then, switching the TED ON/OFF keeps the set temperature.

        • After a certain time passes, the output voltage to the FAN is increased gradually every 15 seconds.

          A01W727E01

  4. FAIL-SAFE


    1. General


      1. Fail-safe control effects the following three controls:


        • Overcurrent protection control

        • Transient voltage drop control

        • Temperature sensor open/short detection control

    2. Overcurrent Protection Control


      1. Areas for detecting overcurrent are provided in the climate controller and the seat heater. The climate control stops or reinstates when the conditions listed below have been met.

        Climate Controller
        Detection Condition

        When both conditions listed below have been met:


        • The climate control seat switch is ON. (Except airflow mode)

        • The amount of current provided for the climate controller actuation has exceeded 10 A for 2 seconds or more.
        Reinstatement Condition

        • When the climate control seat switch is turned OFF, the indicator light turns OFF, and when the switch is operated, the indicator light operates in accordance with the volume.

        • The engine switch is turned to OFF then back to ON (IG).
        Seat Heater
        Detection Condition

        When both conditions listed below have been met:


        • The climate control seat switch is ON. (Except airflow mode)

        • The amount of current provided for the seat heater has exceeded 10 A for 2 seconds or more.
        Reinstatement Condition

        When the climate control seat switch is turned OFF, the indicator light turns OFF, and when the switch is operated, the indicator light operates in accordance with the volume.


        • The engine switch is turned to OFF then back to ON (IG).

    3. Transient Voltage Drop Control


      1. When the power source voltage of the climate control seat ECU has met the conditions listed below, this control stops or is reinstated.

        Detection Condition

        When both conditions listed below have been met:


        • The climate control seat switch is ON.

        • The power source voltage of the climate control seat ECU continuously drops below approximately 8 V for approximately 10 msec.
        Reinstatement Condition The reinstatement conditions consist of the resumption of system control in accordance with the volume setting of the climate control seat switch when the power source voltage of the ECU reaches above approximately 10 V continuously for approximately 10 msec.

    4. Temperature Sensor Open/Short Detection Control


      1. The control is suspended or reinstated when the voltage of the temperature sensors that is supplied to the input signal terminals (TBS, TCS, and HS) has met the conditions listed below:

        Temperature Sensor (for Climate Control)
        Suspended Condition The detected value is 230°F (110°C) or more or - 40°F (- 40°C) or less for 8 consecutive seconds.
        Reinstatement Condition The normal value is detected by the sensors for 8 consecutive seconds.
        Temperature Sensor (for Seat Heater)
        Suspended Condition The detected value is 230°F (110°C) or more or - 40°F (- 40°C) or less for 8 consecutive seconds.
        Reinstatement Condition The normal value is detected by the sensors for 8 consecutive seconds.

  5. DIAGNOSIS


    1. If the climate control seat system malfunctions, the system stops its function and a DTC (Diagnostic Trouble Code) is stored in the climate control seat ECU. The DTC can be read by connecting an GTS to DLC3.