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Climate Control Seat System does not Operate: Wiring Diagram

Fig 1: Wiring Diagram - Climate Control Seat System Does Not Operate
G04051048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. SYSTEM CHECK 
    REFERENCE CHART

    Climate control seat does not operate (Front LH) A
    Climate control seat does not operate (Front RH) B
    Both climate control seats do not operate C

    B: Go to step 8 

    C: Go to step 14 

    A: Go to next step. 

  2. CHECK WIRE HARNESS 
    1. Disconnect the U12 connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U12-4 (GND) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U12-1 (IG) - Body ground Engine switch on (IG) 10 to 14 V
      Fig 2: Identifying U12 Connector
      G04051049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the U12 connector.
    4. Disconnect the U13 connector.
    5. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U13-1 (GND) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U13-2 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 3: Identifying U13 Connector
    G04051050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  3. INSPECT SEAT CLIMATE CONTROL BLOWER 
    1. Check the input signal waveform.
      1. Connect the oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.
      2. Check the signal waveform according to the condition(s) in the table below.
    WAVEFORM REFERENCE CHART

    Item Condition
    Tool setting 2 V/DIV., 500 .,
    Vehicle condition Engine switch on (IG), seat heater switch ON
    Fig 4: Identifying Seat Climate Control Blower Connector Terminals
    G04051051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: The waveform is displayed as shown in the illustration. 

    Result 

    RESULT CHART

    NG A
    OK (Seat cushion blower side) B
    OK (Seatback blower side) C

    B: REPLACE SEAT CUSHION BLOWER 

    C: REPLACE SEATBACK BLOWER 

    A: Go to next step. 

  4. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER) 
    1. Disconnect the J59, U12 and U13 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J59-16 (LOUT) - U12-3 (SIGN) Always Below 1 Ω
      J59-16 (LOUT) - U13-3 (FCTB) Always Below 1 Ω
      J59-16 (LOUT) - Body ground Always 10 kΩ or higher
    Fig 5: Identifying A/C Amplifier Assembly - Seat Climate Control Blower Connector Terminals
    G04051052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  5. CHECK WIRE HARNESS (SEAT HEATER SWITCH) 
    1. Disconnect the J45 connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-12 (E) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-5 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 6: Identifying Seat Heater Switch Connector Terminals
    G04051053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    K: Go to next step. 

  6. INSPECT SEAT HEATER SWITCH 
    1. Disconnect the J45 switch.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-8 (ASS5) - J45-10 (SGND) Always Below 1 kΩ
      J45-9 (LH) - J45-10 (SGND) Blower switch OFF Below 1.1 kΩ
      Blower switch ON (Vol: 3) Below 111 Ω
    Fig 7: Identifying Seat Heater Switch Connector Terminals
    G04051054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SEAT HEATER SWITCH 

    OK: Go to next step. 

  7. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY) 
    1. Disconnect the J45 and J59 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-8 (ASS5) - J59-7 (S5-4) Always Below 1 Ω
      J45-9 (LH) - J59-3 (SW-4) Always Below 1 Ω
      J45-10 (SGND) - J59-10 (SG-4) Always Below 1 Ω
      J45-12 (E) - Body ground Always Below 1 Ω
      J45-8 (ASS5) - Body ground Always 10 kΩ or higher
      J45-9 (LH) - Body ground Always 10 kΩ or higher
    Fig 8: Identifying Seat Heater Switch - A/C Amplifier Assembly Connector Terminals
    G04051055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: REPLACE A/C AMPLIFIER ASSEMBLY 

  8. CHECK WIRE HARNESS 
    1. Disconnect the T12 connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T12-4 (GND) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T12-1 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    3. Reconnect the T12 connector.
      Fig 9: Identifying T12 Connector
      G04051056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the T13 connector.
    5. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T13-1 (GND) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T13-2 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 10: Identifying T13 Connector
    G04051057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  9. INSPECT SEAT CLIMATE CONTROL BLOWER 
    1. Check the input signal waveform.
      1. Connect the oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.
      2. Check the signal waveform according to the condition(s) in the table below.
        WAVEFORM REFERENCE CHART

        Item Condition
        Tool setting 2 V/DIV., 500 .,
        Vehicle condition Engine switch on (IG), seat heater switch ON

        OK: The waveform is displayed as shown in the illustration. 

    Fig 11: Identifying Seat Climate Control Blower Connector Terminals
    G04051058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result 

    RESULT CHART

    NG A
    OK (Seat cushion blower side) B
    OK (Seatback blower side) C

    B: REPLACE SEAT CUSHION BLOWER 

    C: REPLACE SEATBACK BLOWER 

    A: Go to next step. 

  10. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER) 
    1. Disconnect the J59, T12 and T13 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J59-8 (ROUT) - T12-3 (SIGN) Always Below 1 Ω
      J59-8 (ROUT) - T13-3 (VSVG) Always Below 1 Ω
      J59-8 (ROUT) - Body ground Always 10 kΩ or higher
    Fig 12: Identifying A/C Amplifier Assembly - Seat Climate Control Blower Connector Terminals
    G04051059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  11. CHECK WIRE HARNESS (SEAT HEATER SWITCH) 
    1. Disconnect the J45 connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-12 (E) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-5 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 13: Identifying Seat Heater Switch Connector Terminals
    G04051060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  12. INSPECT SEAT HEATER SWITCH 
    1. Disconnect the J45 switch.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-8 (ASS5) - J45-10 (SGND) Always Below 1 kΩ
      J45-7 (RH) - J45-10 (SGND) Blower switch OFF Below 1.1 kΩ
      Blower switch ON (Vol: 3) Below 111 Ω
    Fig 14: Identifying Seat Heater Switch Connector Terminals
    G04051061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SEAT HEATER SWITCH 

    OK: Go to next step. 

  13. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY) 
    1. Disconnect the J45 and J59 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-7 (RH) - J59-2 (SW-5) Always Below 1 Ω
      J45-8 (ASS5) - J59-7 (S5-4) Always Below 1 Ω
      J45-10 (SGND) - J59-10 (SG-4) Always Below 1 Ω
      J45-12 (E) - Body ground Always Below 1 Ω
      J45-7 (RH) - J59-2 (SW-5) Always 10 kΩ or higher
      J45-8 (ASS5) - J59-7 (S5-4) Always 10 kΩ or higher
    Fig 15: Identifying Seat Heater Switch - A/C Amplifier Assembly Connector Terminals
    G04051062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: REPLACE A/C AMPLIFIER ASSEMBLY 

  14. CHECK WIRE HARNESS 
    1. Disconnect the U12 (T12) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      *1: Front LH

      *2: Front RH

      Resistance: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U12-4 (GND) - Body ground Always Below 1 Ω

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T12-4 (GND) - Body ground Always Below 1 Ω

      Voltage: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U12-1 (IG) - Body ground Engine switch on (IG) 10 to 14 V
      Fig 16: Identifying U12 (T12) Seat Cushion Blower Connector
      G04051063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T12-4 (GND) - Body ground Always Below 1 Ω
    3. Reconnect the U12 (T12) connector.
    4. Disconnect the U13 (T13) connector.
    5. Measure the voltage and resistance according to the value(s) in the table below.

      *1: Front LH

      *2: Front RH

      Resistance: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U13-1 (GND) - Body ground Always Below 1 Ω

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      T13-1 (GND) - Body ground Always Below 1 Ω

      Voltage: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U13-2 (IG) - Body ground Engine switch on (IG) 10 to 14 V

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      U13-2 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 17: Identifying U12 (T12) Seatback Blower Connector
    G04051064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  15. INSPECT SEAT CLIMATE CONTROL BLOWER 
    1. Check the input signal waveform.
      1. Connect the oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.
      2. Check the signal waveform according to the condition(s) in the table below.
        WAVEFORM REFERENCE CHART

        Item Condition
        Tool setting 2 V/DIV., 500 .,
        Vehicle condition Engine switch on (IG), seat heater switch ON
        Fig 18: Identifying Seat Climate Control Blower Connector Terminals
        G04051065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK: The waveform is displayed as shown in the illustration. 

    *1: Front LH

    *2: Front RH

    Result 

    RESULT CHART

    NG A
    OK (Seat cushion blower side) B
    OK (Seatback blower side) C

    B: REPLACE SEAT CUSHION BLOWER 

    C: REPLACE SEATBACK BLOWER 

    A: Go to next step. 

  16. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER) 
    1. Disconnect the J59, U12 (T12) and U13 (T13) connectors.

      *1: Front LH

      *2: Front RH

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

      Resistance: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J59-16 (LOUT) - U12-3 (SIGN) Always Below 1 Ω
      J59-16 (LOUT) - U13-3 (FCTB) Always Below 1 Ω
      J59-16 (LOUT) - Body ground Always 10 kΩ or higher

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J59-8 (ROUT) - T12-3 (SIGN) Always Below 1 Ω
      J59-8 (ROUT) - T13-3 (VSVG) Always Below 1 Ω
      J59-8 (ROUT) - Body ground Always 10 kΩ or higher
    Fig 19: Identifying A/C Amplifier Assembly - Seat Climate Control Blower Connector Terminals
    G04051066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  17. CHECK WIRE HARNESS (SEAT HEATER SWITCH) 
    1. Disconnect the J45 connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-12 (E) - Body ground Always Below 1 Ω

      Voltage 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-5 (IG) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 20: Identifying Seat Heater Switch Connector Terminals
    G04051067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step. 

  18. INSPECT SEAT HEATER SWITCH 
    1. Disconnect the J45 switch.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-8 (ASS5) - J45-10 (SGND) Always Below 1 kΩ
      J45-9 (LH) - J45-10 (SGND) Blower switch OFF Below 1.1 kΩ
      Blower switch ON (Vol: 3) Below 111 Ω

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-8 (ASS5) - J45-10 (SGND) Always Below 1 kΩ
      J45-7 (RH) - J45-10 (SGND) Blower switch OFF Below 1.1 kΩ
      Blower switch ON (Vol: 3) Below 111 Ω
    Fig 21: Identifying Seat Heater Switch Connector Terminals
    G04051068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SEAT HEATER SWITCH 

    OK: Go to next step. 

  19. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY) 
    1. Disconnect the J45 and J59 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance: 

      Front LH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-8 (ASS5) - J59-7 (S5-4) Always Below 1 Ω
      J45-9 (LH) - J59-3 (SW-4) Always Below 1 Ω
      J45-10 (SGND) - J59-10 (SG-4) Always Below 1 Ω
      J45-12 (E) - Body ground Always Below 1 Ω
      J45-8 (ASS5) - Body ground Always 10 kΩ or higher
      J45-9 (LH) - Body ground Always 10 kΩ or higher

      Front RH 

      TESTER CONDITION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J45-7 (RH) - J59-2 (SW-5) Always Below 1 Ω
      J45-8 (ASS5) - J59-7 (S5-4) Always Below 1 Ω
      J45-10 (SGND) - J59-10 (SG-4) Always Below 1 Ω
      J45-12 (E) - Body ground Always Below 1 Ω
      J45-7 (RH) - Body ground Always 10 kΩ or higher
      J45-8 (ASS5) - Body ground Always 10 kΩ or higher
    Fig 22: Identifying Seat Heater Switch - A/C Amplifier Assembly Connector Terminals
    G04051069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE WIRE HARNESS 

    OK: REPLACE A/C AMPLIFIER ASSEMBLY 

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