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Terminals Of Ecu

  1. CHECK SEAT CLIMATE CONTROL BLOWER LH (FR) (CLIMATE CONTROL ECU) 
    Fig 1: Identifying Terminals Of Climate Control ECU - LH (FR)
    G03001112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C20 and S48 blower connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.

      Standard: 

      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E (C20 - 8) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IG (C20 -7) - Body ground B - Body ground Power source Ignition switch ON 10 to 14 V
      V5 (C20 - 13) - VG (C20 - 9) GR-R - L Power supply for volume switch Always 5 kΩ
      VS (C20 - 12) - VG (20 - 9) R-B - L Volume switch signal Turn volume switch: Max 0 Ω --> 5 kΩ
      TB5 (C20 - 4) - TBS (20 - 3) L-Y - BR-W Seatback temperature sensor Seatback temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      TC5 (S48 - 2) - TCS (S48 - 1) B - B Seat cushion temperature sensor Seatback temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      DSID (C20 - 6) - Body ground P - Body ground Rear seat heater switch*1 Rear seat climate control switch*2 Ignition switch: ON Turn rear seat heater switch*1 or rear seat climate control switch*2 OFF --> ON 0 V --> 10 to 14 V

      HINT:

      *1: For vehicles with a rear seat heater system

      *2: For vehicles with a rear seat climate control system

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the C20 and S48 blower connectors.
    4. Measure the voltage of the connectors.

    Standard: 

    TERMINAL DESCRIPTION AND SPECIFIED CONDITION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IND (C20-5) - Body ground Y-R - Body ground Climate control switch indicator Ignition switch: ON Turn climate control switch: OFF --> ON 0 V --> 10 to 14 V
    IDL (C20-10) - Body ground W - Body ground Engine idle-up signal Ignition switch: ON Turn climate control switch: OFF --> ON 10 to 14 V --> 0 V
    TDB+ (C20-14) - Body ground LG-B - Body ground Power supply for seatback Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDB- (C20-1) - Body ground B - Body ground Power supply for seatback Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V
    TDC+ (S48-3) - Body ground L - Body ground Power supply for seat cushion Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDC- (S48-6) - Body ground Y - Body ground Power supply for seat cushion Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V

    If the result is not as specified, the ECU may have a malfunction.

  2. CHECK SEAT CLIMATE CONTROL BLOWER RH (FR) (CLIMATE CONTROL ECU) 
    Fig 2: Identifying Terminals Of Climate Control ECU - RH (FR)
    G03001113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C21 and S49 blower connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.

      Standard: 

      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E (C21-8) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IG (C21-7) - Body ground G - Body ground Power source Ignition switch ON 10 to 14 V
      V5 (C21-13) - VG (C21-9) BR-Y - V-R Power source for volume switch Always 5 kΩ
      VS (C21-12) - VG (21-9) B-O - V-R Volume switch signal Turn volume switch: Max. COOL --> Max. WARM 0 Ω --> 5 kΩ
      TB5 (C21-4) - TBS (C21-3) G-Y - R Seatback temperature sensor Turn volume switch: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      TC5 (S49-2) - TCS (S49-1) B -B Seat cushion temperature sensor Turn the volume switch: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      DSID (C21-6) - Body ground GR - Body ground Rear seat heater switch*1 Rear seat climate control switch*2 Ignition switch: ON Turn rear seat heater switch*1 or rear seat climate control switch*2 OFF --> ON 0 V --> 10 to 14 V

      HINT:

      *1: For vehicles with a rear seat heater system

      *2: For vehicles with a rear seat climate control system

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the C21 and S49 blower connectors.
    4. Measure the voltage of the connector.

    Standard: 

    TERMINAL DESCRIPTION AND SPECIFIED CONDITION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IND (C21-5) - Body ground Y-B - Body ground Climate control switch indicator Ignition switch: ON Turn climate control switch: OFF --> ON 0 V --> 10 to 14 V
    TDB+ (C21-14) - Body ground LG-B - Body ground Power supply for seatback Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDB- (C21-1) - Body ground B - Body ground Power supply for seatback Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V
    TDC+ (S49-3) - Body ground L - Body ground Power supply for seat cushion Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDC- (S49-6) - Body ground Y - Body ground Power supply for seat cushion Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V

    If the result is not as specified, the ECU may have a malfunction.

  3. SEAT CLIMATE CONTROL BLOWER LH (RR) (CLIMATE CONTROL ECU) 
    Fig 3: Identifying Terminals Of Climate Control ECU - LH (RR)
    G03001114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C27 and C28 blower connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.

      Standard: 

      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (C27-11) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IG (C27-10) - Body ground R-B - Body ground Power source Ignition switch ON 10 to 14 V
      SW (C27-8) - Body ground L - Body ground Climate control switch Turn the climate control switch ON Below 1 Ω
      V5 (C27-18) - VG (C27-16) Y-R - P Volume switch Always 5 kΩ
      VS (C27-17) - VG (C27-16) GR-R - P Volume switch signal Rear left volume switch: Max. COOL --> Max. WARM 0 Ω --> 5 kΩ
      TB5 (C28-7) - TBS (C28-16) G-Y - R Seatback temperature Seatback temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      H5 (C28-5) - HS (C28-14) L-B - Y-R Seat cushion temperature sensor Seat cushion temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      TC5 (C28-6) - TCS (C28-15) BR-R - P-B Heater temperature sensor Heater temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the C27 and C28 blower connectors.
    4. Measure the voltage of the connectors.

    Standard: 

    TERMINAL DESCRIPTION AND SPECIFIED CONDITION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IND (C27-7) - Body ground R-B - Body ground Climate control switch indicator (rear) Ignition switch: ON Turn climate control switch: OFF --> ON 0 V --> 10 to 14 V
    INDC (C27-6)* - Body ground G-B - Body ground Climate control switch indicator (front) Ignition switch: ON Turn climate control switch: OFF --> ON 0 V --> 10 to 14 V
    TDB+ (C28-1) - Body ground LG-B - Body ground Power supply for seatback Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDB- (C28-2) - Body ground B - Body ground Power supply for seatback Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDC+ (C28-10) - Body ground Y - Body ground Power supply for seat cushion Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDC- (C28-11) - Body ground BR-W - Body ground Power supply for seat cushion Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V
    BBS (C27-3) - Body ground Y-B - Body ground Monitor of fan motor (seatback) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BCS (C27-13) - Body ground V - Body ground Monitor of fan motor (seat cushion) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BFB+ (C27-2) - Body ground G-W - Body ground Power supply for fan motor (seatback) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BFC+ (C27-12) - Body ground L - Body ground Power supply for fan motor (seat cushion) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BFB- (C28-9) - Body ground GR-R - Body ground Ground for fan motor (seatback) Always Below 1 V
    BFC- (C27-1) - Body ground O - Body ground Ground for fan motor (seat cushion) Always Below 1 V
    B (C28-18) - Body ground V-G - Body ground Power supply for seat heater Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    E (C28-8) - Body ground B-R - Body ground Ground for seat heater Always Below 1 V
    IDL (C28-3) - Body ground G - Body ground Engine idle-up signal Ignition switch: ON Turn climate control switch: OFF --> ON 10 to 14 V --> 0 V

    HINT:

    *: For vehicles with a front seat climate control system

    If the result is not as specified, the ECU may have a malfunction.

  4. SEAT CLIMATE CONTROL BLOWER RH (RR) (CLIMATE CONTROL ECU) 
    Fig 4: Identifying Terminals Of Climate Control ECU - RH (RR)
    G03001115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C29 and C30 blower connectors.
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard: 

      TERMINAL DESCRIPTION AND SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (C29-11) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IG (C29-10) - Body ground R-B - Body ground Power source Ignition switch ON 10 to 14 V
      SW (C29-8) - Body ground V-R - Body ground Climate control switch Turn climate control switch ON Below 1 Ω
      V5 (C29-18) - VG (C29-16) L-R - BR-Y Volume switch Always 5 kΩ
      VS (C29-17) - VG (C29-16) GR - BR-Y Volume switch signal Volume switch: 10°C --> 30°C (50°F --> 86°F) 0 Ω --> 5 kΩ
      TB5 (C30-7) - TBS (C30-16) G-Y - R Seatback temperature sensor Seatback temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      H5 (C30-5) - HS (C30-14) L-B - Y-R Seat cushion temperature sensor Seat cushion temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ
      TC5 (C30-6) - TCS (C30-15) BR-R - P-B Seat heater temperature sensor Heater temperature: 10°C --> 30°C (50°F --> 86°F) Approx. 3.7 kΩ --> Approx. 1.7 kΩ

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the C29 and C30 blower connectors.
    4. Measure the voltage of the connectors.

    Standard: 

    TERMINAL DESCRIPTION AND SPECIFIED CONDITION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IND (C29-7) - Body ground B-O - Body ground Climate control switch indicator (rear) Ignition switch: ON Turn climate control switch: OFF --> ON 0 V --> 10 to 14 V
    INDC (C29-6)* - Body ground G-B - Body ground Climate control switch indicator (front) Ignition switch: ON Turn climate control switch: OFF --> ON 0 V --> 10 to 14 V
    TDB+ (C30-1) - Body ground LG-B - Body ground Power supply for seatback Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDB- (C30-2) - Body ground B - Body ground Power supply for seatback Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V
    TDC+ (C30-10) - Body ground Y - Body ground Power supply for seat cushion Peltier element (WARM) Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    TDC- (C30-11) - Body ground BR-W - Body ground Power supply for seat cushion Peltier element (COOL) Ignition switch: ON Turn climate control switch: OFF --> Max. COOL 0 V --> 10 to 14 V
    BBS (C29-3) - Body ground Y-B - Body ground Monitor of fan motor (seatback) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BCS (C29-13) - Body ground V - Body ground Monitor of fan motor (seat cushion) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BFB+ (C29-2) - Body ground G-W - Body ground Power supply for fan motor (seatback) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BFC+ (C29-12) - Body ground L - Body ground Power supply for fan motor (seat cushion) Ignition switch: ON Turn climate control switch: OFF --> ON (airflow) 0 V --> 10 to 14 V
    BFB- (C30-9) - Body ground GR-R - Body ground Ground for fan motor (seatback) Always Below 1 V
    BFC- (C29-1) - Body ground O - Body ground Ground for fan motor (seat cushion) Always Below 1 V
    B (C30-18) - Body ground V-G - Body ground Power supply for seat heater Ignition switch: ON Turn climate control switch: OFF --> Max. WARM 0 V --> 10 to 14 V
    E (C30-8) - Body ground B-R - Body ground Ground for seat heater Always Below 1 V
    IDL (C30-3) - Body ground G - Body ground Engine idle-up signal Ignition switch: ON Turn climate control switch: OFF --> ON 10 to 14 V --> 0 V

    HINT:

    *: For vehicles with a front seat climate control system

    If the result is not as specified, the ECU may have a malfunction.

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