CLIMATE CONTROL SEAT SYSTEM Climate Control System does not Operate on Rear Left Side

DESCRIPTION

The rear seat climate control ECU LH receives rear power seat switch position signals when the engine switch is on (IG), and then transmits airflow amount signals to each seat climate blower.

WIRING DIAGRAM

B006NM8E15

CAUTION / NOTICE / HINT

Tech Tips

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

      Click here

      Result
      Result Proceed to
      Only seat climate control blower assembly LH does not operate A
      Only seat back climate control blower LH does not operate B
      Both climate control blowers do not operate C

    A

    REPLACE REAR SEAT CLIMATE CONTROL BLOWER LH Click here

    C

    CHECK HARNESS AND CONNECTOR (REAR SEAT CLIMATE CONTROL ECU LH - BATTERY AND BODY GROUND) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (REAR SEAT CLIMATE CONTROL BLOWER LH - REAR SEAT BACK CLIMATE CONTROL BLOWER LH)


    1. Disconnect the Y25 rear seat climate control blower LH connector.

    2. Disconnect the R1 rear seat back climate control blower LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y25-3 (IGB) - R1-1 (IGB) Always Below 1 Ω
      Y25-3 (IGB) or R1-1 (IGB) - Body ground Always 10 kΩ or higher
      Y25-4 (VS) - R1-2 (VS) Always Below 1 Ω
      Y25-4 (VS) or R1-2 (VS) - Body ground Always 10 kΩ or higher
      Y25-2 (GND2) - R1-3 (GND2) Always Below 1 Ω
      Y25-2 (GND2) or R1-3 (GND2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK REAR SEAT BACK CLIMATE CONTROL BLOWER LH


    1. Temporarily replace the rear seat back climate control blower LH with a new or normally functioning one.

      Click here

    2. Check the climate control seat operation.

      Click here

      OK
      Climate control seat system is operated normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (REAR SEAT BACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)

    NG

    REPLACE REAR SEAT CLIMATE CONTROL BLOWER LH Click here

  4. CHECK HARNESS AND CONNECTOR (REAR SEAT CLIMATE CONTROL ECU LH - BATTERY AND BODY GROUND)


    1. Disconnect the Y24 rear seat climate control ECU LH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      Y24-13 (+B) - Body ground Always 11 to 14 V
      Y24-12 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y24-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (REAR SEAT CLIMATE CONTROL BLOWER LH - BATTERY AND BODY GROUND)


    1. Disconnect the Y25 rear seat climate control blower LH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Y25-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y25-6 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR SEAT CLIMATE CONTROL ECU LH - REAR SEAT CLIMATE CONTROL BLOWER LH)


    1. Disconnect the Y24 rear seat climate control ECU LH connector.

    2. Disconnect the Y25 rear seat climate control blower LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y24-26 (BLWM) - Y25-5 (SI) Always Below 1 Ω
      Y24-26 (BLWM) or Y25-5 (SI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK REAR SEAT CLIMATE CONTROL ECU LH


    1. B006MBSC01
      *a

      Component with harness connected

      (Rear Seat Climate Control ECU LH)

      Reconnect the Y24 rear seat climate control ECU LH connector.

    2. Reconnect the Y25 rear seat climate control blower LH connector.

    3. Check for pulses according to the condition(s) in the table below.

      Measurement Condition
      Tester Connection Condition Specified Condition
      Y24-26 (BLWM) - Body ground

      • Engine switch on (IG)

      • Heated and ventilated seat main switch on and set to seat blower position

      		 Pulse generation
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT CLIMATE CONTROL BLOWER LH Click here

    NG

  8. INSPECT REAR POWER SEAT SWITCH LH


    1. Remove the rear power seat switch LH.

      Click here

    2. Inspect the rear power seat switch LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR POWER SEAT SWITCH LH Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT SWITCH LH - REAR SEAT CLIMATE CONTROL ECU LH)


    1. Disconnect the Y28 rear power seat switch LH connector.

    2. Disconnect the Y24 rear seat climate control ECU LH connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y28-13 (LHTR) - Y24-7 (HSWM) Always Below 1 Ω
      Y28-13 (LHTR) or Y24-7 (HSWM) - Body ground Always 10 kΩ or higher
      Y28-9 (LVS5) - Y24-19 (HSW5) Always Below 1 Ω
      Y28-9 (LVS5) or Y24-19 (HSW5) - Body ground Always 10 kΩ or higher
      Y28-10 (LVSS) - Y24-18 (HSWS) Always Below 1 Ω
      Y28-10 (LVSS) or Y24-18 (HSWS) - Body ground Always 10 kΩ or higher
      Y28-11 (LVSG) - Y24-20 (HSWG) Always Below 1 Ω
      Y28-11 (LVSG) or Y24-20 (HSWG) - Body ground Always 10 kΩ or higher
      Y28-22 (LGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT CLIMATE CONTROL ECU LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR