CLIMATE CONTROL SEAT SYSTEM TERMINALS OF ECU


  1. CHECK FRONT CLIMATE CONTROL ECU LH

    A000XLQE02

    1. Disconnect the e34 and e114 ECU connectors.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e34-1 (IG) - Body ground P - Body ground Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 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

    3. Reconnect the e34 and e114 ECU connectors.

    4. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e114-1 (B) - Body ground Y - Body ground Power supply for seat heater

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. WARM

      		 11 to 14 V
      e114-6 (H5) - Body ground P - Body ground Seat heater temp signal Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      e114-7 (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) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      e34-5 (BCS) - Body ground BR - Body ground Climate fan motor signal (for seat cushion)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. COOL

      		 Pulse generation (see waveform)
      e34-14 (V5L) - Body ground LG - Body ground Climate control switch signal Power switch on (IG) 5 V
      e34-15 (VGL) - 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 (VSL) - Body ground W - Body ground Climate control switch signal

      Power switch on (IG)

      Climate control switch Max. COOL

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. WARM

      		 5 V
      e34-19 (TC5) - Body ground V - Body ground Climate controller temp signal (for seat cushion) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      e34-20 (TB5) - Body ground SB - Body ground Climate controller temp signal (for seatback) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      e34-21 (INDL) - Body ground B - Body ground Illuminate signal

      Power switch on (IG)

      Climate control switch OFF

      		 11 to 14 V

      Power switch on (IG)

      Climate control switch ON

      		 Below 1 V
    5. A000ZGY

      Using an oscilloscope, check waveform.

      Item Content
      Terminal No. (Symbols) e34-7 (TDC-) - e34-8 (TDC+)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition

      Power switch on (IG)

      Climate control switch Max. COOL

  2. CHECK FRONT CLIMATE CONTROL ECU RH

    A000VVEE02

    1. Disconnect the e105 and e4 ECU connectors.

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

      Terminal No (.Symbols) Wiring Color Terminal Description Condition Specified Condition
      e4-1 (IG) - Body ground

      Y*1 - Body ground

      GR*2 - Body ground

      		 Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 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

    3. Reconnect the e105 and e4 ECU connectors.

    4. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      e105-1 (B) - Body ground Y - Body ground Power supply for seat heater

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. WARM

      		 11 to 14 V
      e105-6 (H5) - Body ground P - Body ground Seat heater temp signal Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      e105-7 (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) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      e4-5 (BCS) - Body ground BR - Body ground Climate fan motor signal (for seat cushion)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. COOL

      		 Pulse generation (see waveform)
      e4-14 (V5R) - Body ground LG - Body ground Climate control switch signal Power switch on (IG) 5 V
      e4-15 (VGR) - 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 (VSR) - Body ground W - Body ground Climate control switch signal

      Power switch on (IG)

      Climate control switch Max. COOL

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. WARM

      		 5 V
      e4-19 (TC5) - Body ground V - Body ground Climate controller temp signal (for seat cushion) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      e4-20 (TB5) - Body ground SB - Body ground Climate controller temp signal (for seatback) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      e4-21 (INDR) - Body ground B - Body ground Illuminate signal

      Power switch on (IG)

      Climate control switch OF

      		 11 to 14 V

      Power switch on (IG)

      Climate control switch ON

      		 Below 1 V

      Tech Tips


      • *1: for LHD

      • *2: for RHD

    5. A000ZGY

      Using an oscilloscope, check waveform.

      Item Content
      Terminal No. (Symbols) e4-7 (TDC-) - e4-8 (TDC+)
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition

      Power switch on (IG)

      Climate control switch Max. COOL

  3. CHECK REAR SEAT CLIMATE CONTROL ECU RH

    A000U1YE02

    1. Disconnect the f47 and f8 ECU connectors.

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

      Terminal No (.Symbols) Wiring Color Terminal Description Condition Specified Condition
      f8-1 (IG) - Body ground Y - Body ground Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 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

    3. Reconnect the f47 and f8 ECU connectors.

    4. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      f47-1 (AMP) - Body ground L - Body ground Power supply for seat heater

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. WARM

      		 11 to 14 V
      f47-6 (H5) - Body ground BR - Body ground Seat heater temp signal Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      f47-7 (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) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      f8-5 (BCS) - Body ground V - Body ground Climate fan motor signal (for seat cushion)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power 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)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 Ω
      f8-19 (TC5) - Body ground L - Body ground Climate controller temp signal (for seat cushion) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      f8-20 (TB5) - Body ground L - Body ground Climate controller temp signal (for seatback) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      f8-24 (BFB+) - Body ground G - Body ground Climate fan motor signal (for seatback) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      f8-25 (BBS) - Body ground Y - Body ground Climate fan motor signal (for seatback)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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
    5. A000Y76

      Using an oscilloscope, check waveform.

      Item Content
      Terminal No. (Symbols) f8-7 (TDC-) - f8-8 (TDC+)
      Tool Setting 500 mV/DIV., 200 ms/DIV.
      Condition

      Power switch on (IG)

      Climate control switch Max. COOL

  4. CHECK REAR SEAT CLIMATE CONTROL ECU LH

    A000XF0E02

    1. Disconnect the f51 and f28 ECU connectors.

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

      Terminal No (Symbols.) Wiring Color Terminal Description Condition Specified Condition
      f28-1 (IG) - Body ground P - Body ground Power source Power switch on (IG) 11 to 14 V
      Power switch off Below 1 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

    3. Reconnect the f51 and f28 ECU connectors.

    4. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      f51-1 (AMP) - Body ground L - Body ground Power supply for seat heater

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      Climate control switch Max. WARM

      		 11 to 14 V
      f51-9 (H5) - Body ground BR - Body ground Seat heater temp signal Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      f51-10 (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) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      f28-5 (BCS) - Body ground V - Body ground Climate fan motor signal (for seat cushion)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 Ω
      f28-17 (TBS) - Body ground B - Body ground Climate controller temp signal ground (for seatback)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 Ω
      f28-19 (TC5) - Body ground L - Body ground Climate controller temp signal (for seat cushion) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      f28-20 (TB5) - Body ground L - Body ground Climate controller temp signal (for seatback) Power switch off Below 1 V
      Power switch on (IG) 1 to 4 V
      f28-24 (BFB+) - Body ground G - Body ground Climate fan motor signal (for seatback) Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      f28-25 (BBS) - Body ground Y - Body ground Climate fan motor signal (for seatback)

      Power switch on (IG)

      Climate control switch OFF

      		 Below 1 V

      Power switch on (IG)

      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
    5. A000Y76

      Using an oscilloscope, check waveform.

      Item Content
      Terminal No. (Symbols) f28-7 (TDC-) - f28-8 (TDC+)
      Tool Setting 500 mV/DIV., 200 ms/DIV.
      Condition

      Power switch on (IG)

      Climate control switch Max. COOL