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

DESCRIPTION

The rear seat climate control ECU RH 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

A01CB2PE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK CLIMATE CONTROL SEAT SYSTEM


    1. Check the climate control seat operation again Click here.

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

    B

    REPLACE REAR SEAT CLIMATE CONTROL BLOWER RH Click here

    C

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

    A

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


    1. Disconnect the X3 rear seat climate control blower RH connector.

    2. Disconnect the P3 rear seat back climate control blower RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X3-3 (IGB) - P3-1 (IGB) Always Below 1 Ω
      X3-3 (IGB) - Body ground Always 10 kΩ or higher
      X3-4 (VS) - P3-2 (VS) Always Below 1 Ω
      X3-4 (VS) - Body ground Always 10 kΩ or higher
      X3-2 (GND2) - P3-3 (GND2) Always Below 1 Ω
      X3-2 (GND2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE REAR SEAT BACK CLIMATE CONTROL BLOWER RH


    1. Replace the rear seat back climate control blower RH Click here.


    NEXT

  4. CHECK CLIMATE CONTROL SEAT SYSTEM


    1. Check the climate control seat operation Click here.

      OK
      The climate control seat operates normally.

    NG

    REPLACE REAR SEAT CLIMATE CONTROL BLOWER RH Click here

    OK

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

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


    1. Disconnect the X7 rear seat climate control ECU RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X7-13 (+B) - Body ground Always 11 to 14 V
      X7-12 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      X7-3 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the X3 rear seat climate control blower RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X3-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      X3-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (REAR SEAT CLIMATE CONTROL ECU RH - REAR SEAT CLIMATE CONTROL BLOWER RH)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X7-24 (BLWM) - X3-5 (SI) Always Below 1 Ω
      X7-24 (BLWM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK REAR SEAT CLIMATE CONTROL ECU RH


    1. Reconnect the X7 rear seat climate control ECU RH connector.

    2. Reconnect the X3 rear seat climate control blower RH connector.

      A01CFUQE02

    3. Check the input signal waveform.


      1. Connect an oscilloscope to terminal 24 and body ground with the rear seat climate control blower RH connector still connected.

      2. Check the signal waveform according to the condition(s) in the table below.

        Terminal No. X7-24 (BLWM) - Body ground
        Tool Setting 1 V/DIV., 1ms./DIV.
        Vehicle Condition

        Heated and ventilated seat main switch on and set to low volume (blower position)

        (blower position)
        Text in Illustration
        *a

        Component with harness connected

        (Rear Seat Climate Control ECU RH)
        OK
        Waveform is output normally (refer to illustration).

    NG

    INSPECT REAR POWER SEAT SWITCH (FOR REAR RIGHT SEAT) Click here

    OK

    REPLACE REAR SEAT CLIMATE CONTROL BLOWER RH Click here

  9. INSPECT REAR POWER SEAT SWITCH (FOR REAR RIGHT SEAT)


    1. A01CDW5E01
      Text in Illustration
      *a

      Component without harness connected

      (Rear Power Seat Switch (for Rear Right Seat))

      Remove the rear power seat switch (for rear right seat) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      9 - 10

      Heated and ventilated seat main switch set to low volume

      (blower position)

      		 350 Ω
      9 - 11 Always 5.1 kΩ

    NG

    REPLACE REAR POWER SEAT SWITCH (FOR REAR RIGHT SEAT) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT SWITCH - REAR SEAT CLIMATE CONTROL ECU RH)


    1. Disconnect the X7 rear seat climate control ECU RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X6-13 (RHTR) - X7-7 (HSWM) Always Below 1 Ω
      X6-13 (RHTR) - Body ground Always 10 kΩ or higher
      X6-9 (RVS5) - X7-19 (HSW5) Always Below 1 Ω
      X6-9 (RVS5) - Body ground Always 10 kΩ or higher
      X6-11 (RVSG) - X7-20 (HSWG) Always Below 1 Ω
      X6-11 (RVSG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT SWITCH - POSITION CONTROL ECU ASSEMBLY - BODY GROUND)


    1. Disconnect the X8 and X9 position control ECU assembly (for rear right seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X6-22 (RGND) - X9-17 (SSWE) Always Below 1 Ω
      X6-22 (RGND) - Body ground Always 10 kΩ or higher
      X8-8 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. REPLACE REAR SEAT CLIMATE CONTROL ECU RH


    1. Replace the rear seat climate control ECU RH Click here.


    NEXT

  13. CHECK CLIMATE CONTROL SEAT SYSTEM


    1. Check the climate control seat operation Click here.

      OK
      The climate control seat operates normally.

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) Click here

    OK

    END (REAR SEAT CLIMATE CONTROL ECU RH WAS DEFECTIVE)