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

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DTC Code DTC Name
  Climate Control System does not Operate on Rear Left Side
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DESCRIPTION

The air conditioning amplifier assembly receives ventilation volume switch signals when the power switch is on (IG), and then transmits airflow amount signals to each seat climate blower.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

  • The climate control seat system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the climate control seat system after confirming that the communication system is functioning properly.

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  • If the auxiliary battery voltage is low, the climate control seat system may not operate. When "High Power Consumption Partial Limit On AC/Heater Operation" is displayed on the multi-information display in the combination meter assembly, inspect the auxiliary battery, referring to On-vehicle Inspection for the charging system.

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Tip:

If the auxiliary battery voltage is low, the climate control seat system may not operate. When "High Power Consumption Partial Limit On AC/Heater Operation" is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".

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PROCEDURE


  1. Click here

    CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation.

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

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    CHECK HARNESS AND CONNECTOR (REAR SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH - REAR SEATBACK CLIMATE CONTROL BLOWER LH)


    1. Disconnect the T8 rear seat cushion climate control blower assembly LH connector.

    2. Disconnect the R53 rear seatback 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
      T8-5 (CTB) - R53-1 (IG) Always Below 1 Ω
      T8-5 (CTB) or R53-1 (IG) - Other terminals and body ground Always 10 kΩ or higher
      T8-6 (BBS) - R53-3 (BFB+) Always Below 1 Ω
      T8-6 (BBS) or R53-3 (BFB+) - Other terminals and body ground Always 10 kΩ or higher
      T8-4 (BFB-) - R53-4 (GND) Always Below 1 Ω
      T8-4 (BFB-) or R53-4 (GND) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    REPLACE REAR SEATBACK CLIMATE CONTROL BLOWER LH


    1. Temporarily replace the rear seatback climate control blower LH with a new or known good one.

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      Result
      Proceed to
      NEXT

  4. Click here

    CHECK CLIMATE CONTROL SEAT OPERATION


    1. Check the climate control seat operation again.

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      OK
      The climate control seat operates normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (REAR SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)

    • NG

      REPLACE REAR SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LHClick here

  5. Click here

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


    1. Disconnect the T8 rear seat cushion climate control blower assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T8-8 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T8-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - REAR SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH)


    1. Disconnect the G63 air conditioning amplifier assembly connector.

    2. Disconnect the T8 rear seat cushion climate control blower assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G63-26 (SVPB) - T8-7 (SING) Always Below 1 Ω
      G63-26 (SVPB) or T8-7 (SING) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. B004YF7C05
      Table 1.
      *1 SVPB
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Table 2. Measurement Condition
      Item Content
      Tester Connection G63-26 (SVPB) - Body ground
      Tool Setting 1 V/DIV., 1 ms/DIV.
      Vehicle Condition

      • Power switch on (IG)

      • Ventilation volume switch on
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE REAR SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LHClick here

    • NG

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here