LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> LS 460L >> Repair and Diagnosis >> Body & Frame >> Seats >> Climate Control Seat System >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

  1. CHECK FRONT CLIMATE CONTROL ECU LH 
    Fig 1: Identifying e34 And e35 Front Climate Control ECU Connector Terminals
    G04952605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e34 and e35 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 and e35 ECU connectors.
    4. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 on (IG) Turn climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch ON 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-) - Body ground O - Body ground 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
      e34-8 (TDC+) - Body ground V - Body ground Power supply for seat cushion Peltier element (WARM) Engine switch on (IG) Turn climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      e34-9 (TDB-) - Body ground R - Body ground Power supply for seatback 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
      e34-10 (TDB+) - Body ground G - Body ground Power supply for seatback Peltier element (WARM) Engine switch on (IG) Turn climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      e34-14 (V5) - Body ground LG - Body ground Climate control switch signal Engine switch on (IG) 5V
      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 5V
      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 Below 1 V
      Engine switch on (IG) Turn climate control switch ON 11 to 14 V

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

  2. CHECK FRONT CLIMATE CONTROL ECU RH 
    Fig 2: Identifying e3 And e4 Front Climate Control ECU Connector Terminals
    G04952606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e3 and e4 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 e3 and e4 ECU connectors.
    4. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 on (IG) Turn climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch ON 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-) - Body ground G - Body ground 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
      e4-8 (TDC+) - Body ground Y - Body ground Power supply for seat cushion Peltier element (WARM) Engine switch on (IG) Turn climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      e4-9 (TDB-) - Body ground O - Body ground Power supply for seatback 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
      e4-10 (TDB+) - Body ground V - Body ground Power supply for seatback Peltier element (WARM) Engine switch on (IG) Turn climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      e4-14 (V5) - Body ground LG - Body ground Climate control switch signal Engine switch on (IG) 5V
      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 5V
      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 Below 1 V
      Engine switch on (IG) Turn climate control switch ON 11 to 14 V

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

  3. CHECK REAR SEAT CLIMATE CONTROL ECU RH 
    Fig 3: Identifying f7 And f8 Rear Seat Climate Control ECU Connector Terminals
    G04952607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the f7 and f8 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 f7 and f8 ECU connectors.
    4. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Climate control switch ON 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 O - Body ground Climate fan motor signal (for seat cushion) Always Below 1 Ω
      f8-7 (TDC-) - Body ground BR - Body ground 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
      f8-8 (TDC+) - Body ground Y - Body ground Power supply for seat cushion Peltier element (WARM) Engine switch on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      f8-9 (TDB-) - Body ground W - Body ground Power supply for seatback 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
      f8-10 (TDB+) - Body ground LG - Body ground Power supply for seatback Peltier element (WARM) Engine switch on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      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 on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Climate control switch ON 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.

  4. CHECK REAR SEAT CLIMATE CONTROL ECU LH 
    Fig 4: Identifying f27 And f28 Rear Seat Climate Control ECU Connector Terminals
    G04952608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the f27 and f28 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 f27 and f28 ECU connectors.
    4. Measure the voltage and resistance of the connectors.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      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 on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Climate control switch ON 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 O - Body ground Climate fan motor signal (for seat cushion) Always Below 1 Ω
      f28-7 (TDC-) - Body ground BR - Body ground 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
      f28-8 (TDC+) - Body ground Y - Body ground Power supply for seat cushion Peltier element (WARM) Engine switch on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      f28-9 (TDB-) - Body ground W - Body ground Power supply for seatback 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
      f28-10 (TDB+) - Body ground LG - Body ground Power supply for seatback Peltier element (WARM) Engine switch on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Turn climate control switch Max. WARM Pulse generation
      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 on (IG) Climate control switch OFF Below 1 V
      Engine switch on (IG) Climate control switch ON 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) 4to7V
      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.

scientia non olet · About LEMON Manuals