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Terminals Of Ecu

  1. CHECK FRONT CLIMATE CONTROL ECU LH 
    Fig 1: Identifying Front Climate Control ECU LH Connector Terminal Identification
    GTY117463Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e34 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e34-1 (IG) - Body ground P - Body ground Power source Engine switch on (IG) 11 to 14 V
      e34-2 (SYSB) - Body ground R - Body ground Power source Always 11 to 14 V
      e34-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      e34-13 (LIN) - Body ground L - Body ground LIN line Always 10 kΩ or higher

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

    3. Reconnect the e34 ECU connector.
    4. Measure the voltage and resistance of the connectors.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e35-1 (B) - Body ground Y - Body ground Power supply for seat heater Engine switch on (IG)
      Turn climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. WARM      		 11 to 14 V
      e35-5 (E) - Body ground V - Body ground Ground Always Below 1 Ω
      e35-9 (H5) - Body ground P - Body ground Seat heater temp signal Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      e35-10 (HS) - Body ground L - Body ground Seat heater temp signal ground Always Below 1 Ω
      e34-4 (BFC+) - Body ground P - Body ground Climate fan motor signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      e34-5 (BCS) - Body ground BR - Body ground Climate fan motor signal (for seat cushion) Engine switch on (IG)
      Turn climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch ON (fan position)      		 3 to 8 V
      e34-6 (BFC-) - Body ground GR - Body ground Climate fan motor signal (for seat cushion) Always Below 1 Ω
      e34-7 (TDC-) - e34-8 (TDC+) R - Y Power supply for seat cushion
      Peltier element (COOL)      		 Engine switch on (IG)
      Turn climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. COOL      		 Pulse generation (see waveform)
      e34-14 (V5) - Body ground LG - Body ground Climate control switch signal Engine switch on (IG) 5 V
      e34-15 (VG) - Body ground G - Body ground Climate control switch signal ground Always Below 1 Ω
      e34-16 (TCS) - Body ground R - Body ground Climate controller temp signal ground (for seat cushion) Always Below 1 Ω
      e34-17 (TBS) - Body ground L - Body ground Climate controller temp signal ground (for seatback) Always Below 1 Ω
      e34-18 (VS) - Body ground W - Body ground Climate control switch signal Engine switch on (IG)
      Turn climate control switch Max. COOL      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. WARM      		 5 V
      e34-19 (TC5) - Body ground V - Body ground Climate controller temp signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      e34-20 (TB5) - Body ground SB - Body ground Climate controller temp signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      e34-21 (IND) - Body ground B - Body ground Illuminate signal Engine switch on (IG)
      Turn climate control switch OFF      		 11 to 14 V
      Engine switch on (IG)
      Turn climate control switch ON      		 Below 1 V
      • If the result is not as specified, the ECU may have a malfunction.
    5. Using an oscilloscope, check waveform.
      Fig 2: Identifying Waveform 1
      GTY128176Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. (Symbols) e34-7 (TDC-) - e34-8 (TDC+)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Engine switch on (IG)
      Turn climate control switch Max. COOL
  2. CHECK FRONT CLIMATE CONTROL ECU RH 
    Fig 3: Identifying Front Climate Control ECU RH Connector Terminal Identification
    GTY117459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e4 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      Terminal No (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e4-1 (IG) - Body ground Y - Body ground Power source Engine switch on (IG) 11 to 14 V
      e4-2 (SYSB) - Body ground W - Body ground Power source Always 11 to 14 V
      e4-11 (VER) - Body ground W-B - Body ground Ground Always Below 1 Ω
      e4-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      e4-13 (LIN) - Body ground L - Body ground LIN line Always 10 kΩ or higher

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

    3. Reconnect the e4 ECU connector.
    4. Measure the voltage and resistance of the connectors.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e3-1 (B) - Body ground Y - Body ground Power supply for seat heater Engine switch on (IG)
      Turn climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. WARM      		 11 to 14 V
      e3-5 (E) - Body ground V - Body ground Ground Always Below 1 Ω
      e3-9 (H5) - Body ground P - Body ground Seat heater temp signal Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      e3-10 (HS) - Body ground L - Body ground Seat heater temp signal ground Always Below 1 Ω
      e4-4 (BFC+) - Body ground P - Body ground Climate fan motor signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      e4-5 (BCS) - Body ground BR - Body ground Climate fan motor signal (for seat cushion) Engine switch on (IG)
      Turn climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch ON (fan position)      		 3 to 8 V
      e4-6 (BFC-) - Body ground GR - Body ground Climate fan motor signal (for seat cushion) Always Below 1 Ω
      e4-7 (TDC-) - e4-8 (TDC+) BE - Y Power supply for seat cushion
      Peltier element (COOL)      		 Engine switch on (IG)
      Turn climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. COOL      		 Pulse generation (see waveform)
      e4-14 (V5) - Body ground LG - Body ground Climate control switch signal Engine switch on (IG) 5 V
      e4-15 (VG) - Body ground G - Body ground Climate control switch signal ground Always Below 1 Ω
      e4-16 (TCS) - Body ground R - Body ground Climate controller temp signal ground (for seat cushion) Always Below 1 Ω
      e4-17 (TBS) - Body ground L - Body ground Climate controller temp signal ground (for seatback) Always Below 1 Ω
      e4-18 (VS) - Body ground W - Body ground Climate control switch signal Engine switch on (IG)
      Turn climate control switch Max. COOL      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. WARM      		 5 V
      e4-19 (TC5) - Body ground V - Body ground Climate controller temp signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      e4-20 (TB5) - Body ground SB - Body ground Climate controller temp signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      e4-21 (IND) - Body ground B - Body ground Illuminate signal Engine switch on (IG)
      Turn climate control switch OF      		 11 to 14 V
      Engine switch on (IG)
      Turn climate control switch ON      		 Below 1 V
      • If the result is not as specified, the ECU may have a malfunction.
    5. Using an oscilloscope, check waveform.
      Fig 4: Identifying Waveform 1
      GTY128176Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. (Symbols) e4-7 (TDC-) - e4-8 (TDC+)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Engine switch on (IG)
      Turn climate control switch Max. COOL
  3. CHECK REAR SEAT CLIMATE CONTROL ECU RH 
    Fig 5: Rear Seat Climate Control ECU RH Connector Terminal Identification
    GTY117460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the f8 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      Terminal No (.Symbols) Wiring Color Terminal Description Condition Specified Condition
      f8-1 (IG) - Body ground Y - Body ground Power source Engine switch on (IG) 11 to 14 V
      f8-2 (SYSB) - Body ground G - Body ground Power source Always 11 to 14 V
      f8-11 (VER) - Body ground W-B - Body ground Ground Always Below 1 Ω
      f8-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      f8-13 (LIN) - Body ground V - Body ground LIN line Always 10 kΩ or higher

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

    3. Reconnect the f8 ECU connector.
    4. Measure the voltage and resistance of the connectors.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      f7-1 (B) - Body ground L - Body ground Power supply for seat heater Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. WARM      		 11 to 14 V
      f7-5 (E) - Body ground Y - Body ground Ground Always Below 1 Ω
      f7-9 (H5) - Body ground BR - Body ground Seat heater temp signal Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      f7-10 (HS) - Body ground P - Body ground Seat heater temp signal ground Always Below 1 Ω
      f8-4 (BFC+) - Body ground W - Body ground Climate fan motor signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      f8-5 (BCS) - Body ground V - Body ground Climate fan motor signal (for seat cushion) Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Climate control switch (fan position)      		 3 to 8 V
      f8-6 (BFC-) - Body ground BE - Body ground Climate fan motor signal (for seat cushion) Always Below 1 Ω
      f8-7 (TDC-) - f8-8 (TDC+) W - Y Power supply for seat cushion
      Peltier element (COOL)      		 Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. COOL      		 Pulse generation (see waveform)
      f8-16 (TCS) - Body ground B - Body ground Climate controller temp signal ground (for seat cushion) Always Below 1 Ω
      f8-17 (TBS) - Body ground B - Body ground Climate controller temp signal ground (for seatback) Always Below 1 Ω
      f8-19 (TC5) - Body ground L - Body ground Climate controller temp signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      f8-20 (TB5) - Body ground L - Body ground Climate controller temp signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      f8-24 (BFB+) - Body ground G - Body ground Climate fan motor signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      f8-25 (BBS) - Body ground Y - Body ground Climate fan motor signal (for seatback) Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch ON (fan position)      		 4 to 7 V
      f8-26 (BFB-) - Body ground GR - Body ground Climate fan motor signal (for seatback) Always Below 1 Ω
      • If the result is not as specified, the ECU may have a malfunction.
    5. Using an oscilloscope, check waveform.
      Fig 6: Identifying Waveform 1
      GTY128113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. (Symbols) f8-7 (TDC-) - f8-8 (TDC+)
      Tool Setting 500 mV/DIV., 200 ms/DIV.
      Condition Engine switch on (IG)
      Turn climate control switch Max. COOL
  4. CHECK REAR SEAT CLIMATE CONTROL ECU LH 
    Fig 7: Rear Seat Climate Control ECU LH Connector Terminal Identification
    GTY288638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the f28 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      Terminal No (Symbols.) Wiring Color Terminal Description Condition Specified Condition
      f28-1 (IG) - Body ground P - Body ground Power source Engine switch on (IG) 11 to 14 V
      f28-2 (SYSB) - Body ground V - Body ground Power source Always 11 to 14 V
      f28-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      f28-13 (LIN) - Body ground V - Body ground LIN line Always 10 kΩ or higher

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

    3. Reconnect the f28 ECU connector.
    4. Measure the voltage and resistance of the connectors.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      f27-1 (B) - Body ground L - Body ground Power supply for seat heater Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. WARM      		 11 to 14 V
      f27-5 (E) - Body ground Y - Body ground Ground Always Below 1 Ω
      f27-9 (H5) - Body ground BR - Body ground Seat heater temp signal Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      f27-10 (HS) - Body ground P - Body ground Seat heater temp signal ground Always Below 1 Ω
      f28-4 (BFC+) - Body ground W - Body ground Climate fan motor signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      f28-5 (BCS) - Body ground V - Body ground Climate fan motor signal (for seat cushion) Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch ON (fan position)      		 3 to 8 V
      f28-6 (BFC-) - Body ground BE - Body ground Climate fan motor signal (for seat cushion) Always Below 1 Ω
      f28-7 (TDC-) - f28-8 (TDC+) W - Y Power supply for seat cushion
      Peltier element (COOL)      		 Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch Max. COOL      		 Pulse generation (see waveform)
      f28-16 (TCS) - Body ground B - Body ground Climate controller temp signal ground (for seat cushion) Always Below 1 Ω
      f28-17 (TBS) - Body ground B - Body ground Climate controller temp signal ground (for seatback) Always Below 1 Ω
      f28-19 (TC5) - Body ground L - Body ground Climate controller temp signal (for seat cushion) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      f28-20 (TB5) - Body ground L - Body ground Climate controller temp signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 1 to 4 V
      f28-24 (BFB+) - Body ground G - Body ground Climate fan motor signal (for seatback) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      f28-25 (BBS) - Body ground Y - Body ground Climate fan motor signal (for seatback) Engine switch on (IG)
      Climate control switch OFF      		 Below 1 V
      Engine switch on (IG)
      Turn climate control switch ON (fan position)      		 4 to 7 V
      f28-26 (BFB-) - Body ground GR - Body ground Climate fan motor signal (for seatback) Always Below 1 Ω
      • If the result is not as specified, the ECU may have a malfunction.
    5. Using an oscilloscope, check waveform.
      Fig 8: Identifying Waveform 1
      GTY128113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Content
      Terminal No. (Symbols) f28-7 (TDC-) - f28-8 (TDC+)
      Tool Setting 500 mV/DIV., 200 ms/DIV.
      Condition Engine switch on (IG)
      Turn climate control switch Max. COOL
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