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Terminals Of Ecu

  1. CHECK SEAT CLIMATE CONTROL ECU LH 
    Fig 1: Identifying Terminals Of ECU
    G05764894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the c38 and c39 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      CONNECTOR TERMINAL REFERENCE

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      c38-1 (IG) - Body ground G - Body ground Power source Engine switch on (IG) 11 to 14 V
      c38-2 (B) - Body ground G - Body ground Power source Always 11 to 14 V
      c38-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the c38 and c39 ECU connectors.
    4. Measure the voltage and resistance of the connectors.
      CONNECTOR TERMINAL REFERENCE

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      c39-1 (B) - Body ground W - Body ground Power supply for seat heater Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max warm 11 to 14 V
      c39-5 (E) - Body ground B - Body ground Ground Always Below 1 Ω
      c39-9 (H5) - Body ground LG - Body ground Seat heater temperature signal Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4V
      c39-10 (HS) - Body ground O - Body ground Seat heater temperature signal ground Always Below 1 Ω
      c38-4 (BFC+) - Body ground LG - Body ground Seat climate control blower signal (for seat cushion) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch on 11 to 14 V
      c38-5 (BCS) - Body ground L - Body ground Seat climate control blower signal (for seat cushion) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch on (blower position) 3 to 8V
      c38-6 (BFC-) - Body ground B - Body ground Seat climate control blower signal (for seat cushion) Always Below 1 Ω
      c38-7 (TDC-) - Body ground L - Body ground Power supply for seat cushion Peltier element (Cool) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max cool Pulse generation
      c38-8 (TDC+) - Body ground R - Body ground Power supply for seat cushion Peltier element (Warm) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max warm Pulse generation
      c38-9 (TDB-) - Body ground SB - Body ground Power supply for seatback Peltier element (Cool) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max cool Pulse generation
      c38-10 (TDB+) - Body ground R - Body ground Power supply for seatback Peltier element (Warm) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max warm Pulse generation
      c38-14 (V5) - Body ground B - Body ground Climate control seat switch signal Engine switch on (IG) 5V
      c38-15 (VG) - Body ground BR - Body ground Climate control seat switch signal ground Always Below 1 Ω
      c38-16 (TCS) - Body ground V - Body ground Seat climate control controller temperature signal ground (for seat cushion) Always Below 1 Ω
      c38-17 (TBS) - Body ground GR - Body ground Seat climate control controller temperature signal ground (for seatback) Always Below 1 Ω
      c38-18 (VS) - Body ground W - Body ground Climate control seat switch signal Engine switch on (IG) Climate control seat switch max cool Below 1 V
      Engine switch on (IG) Climate control seat switch max warm 5V
      c38-19 (TC5) - Body ground Y - Body ground Seat climate control controller temperature signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4V
      c38-20 (TB5) - Body ground G - Body ground Seat climate control controller temperature signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      c38-21 (IND) - Body ground R - Body ground Illumination signal Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch on 11 to 14 V

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

  2. CHECK SEAT CLIMATE CONTROL ECU RH 
    Fig 2: Identifying c24 And c25 ECU Connectors
    G05764895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the c24 and c25 ECU connectors.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      CONNECTOR TERMINAL REFERENCE

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      c24-1 (IG) - Body ground G - Body ground Power source Engine switch on (IG) 11 to 14 V
      c24-2 (B) - Body ground G - Body ground Power source Always 11 to 14 V
      c24-11 (VER) - Body ground W-B - Body ground Ground Always Below 1 Ω
      c24-12(GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the c24 and c25 ECU connectors.
    4. Measure the voltage and resistance according to the value(s) in the table below.
      CONNECTOR TERMINAL REFERENCE

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      c25-1 (B) - Body ground W - Body ground Power supply for seat heater Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max warm 11 to 14 V
      c25-5 (E) - Body ground B - Body ground Ground Always Below 1 Ω
      c25-9 (H5) - Body ground LG - Body ground Seat heater temperature signal Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4V
      c25-10 (HS) - Body ground O - Body ground Seat heater temperature signal ground Always Below 1 Ω
      c24-4 (BFC+) - Body ground LG - Body ground Seat climate control blower signal (for seat cushion) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch on 11 to 14 V
      c24-5 (BCS) - Body ground L - Body ground Seat climate control blower signal (for seat cushion) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch on (blower position) 3 to 8 V
      c24-6 (BFC-) - Body ground B - Body ground Seat climate control blower signal (for seat cushion) Always Below 1 Ω
      c24-7 (TDC-) - Body ground Y - Body ground Power supply for seat cushion Peltier element (Cool) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max cool Pulse generation
      c24-8 (TDC+) - Body ground R - Body ground Power supply for seat cushion Peltier element (Warm) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max warm Pulse generation
      c24-9 (TDB-) - Body ground SB - Body ground Power supply for seatback Peltier element (Cool) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max cool Pulse generation
      c24-10 (TDB+) - Body ground R - Body ground Power supply for seatback Peltier element (Warm) Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch max warm Pulse generation
      c24-14 (V5) - Body ground B - Body ground Climate control seat switch signal Engine switch on (IG) 5V
      c24-15 (VG) - Body ground BR - Body ground Climate control seat switch signal ground Always Below 1 Ω
      c24-16 (TCS) - Body ground V - Body ground Seat climate control controller temperature signal ground (for seat cushion) Always Below 1 Ω
      c24-17 (TBS) - Body ground GR - Body ground Seat climate control controller temperature signal ground (for seatback) Always Below 1 Ω
      c24-18 (VS) - Body ground W - Body ground Climate control seat switch signal Engine switch on (IG) Climate control seat switch max cool Below 1 V
      Engine switch on (IG) Climate control seat switch max warm 5V
      c24-19(TC5) - Body ground L - Body ground Seat climate control controller temperature signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      c24-20 (TB5) - Body ground G - Body ground Seat climate control controller temperature signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      c24-21 (IND) - Body ground R - Body ground Illumination signal Engine switch on (IG) Climate control seat switch off Below 1 V
      Engine switch on (IG) Climate control seat switch on 11 to 14 V

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

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