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Terminals Of Ecu

  1. CHECK COMBINATION METER 
    Fig 1: Identifying Terminals Of ECU
    G05298438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K31 meter connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      K31-40 (E2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K31-1 (IG+) - E2 (K31-40) R - W-B Engine switch signal Engine switch off Below 1 V
      Engine switch on (IG) 10 to 14 V
      K31-21 (B) - Body ground B - Body ground Battery Always 10 to 14 V

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

    3. Reconnect the K31 meter connector.
    4. Measure the voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      K31-31 (PBLT) - Body ground O - Body ground Seat belt warning light signal (for passenger side) Passenger seat is occupied and its seat belt is unfastened Alternating between 10 to 14 V and below 1 V
      Passenger seat is occupied and its seat belt is fastened Below 1 V
      z2-6 - Body ground - Seat belt warning light signal (driver side) Driver seat belt is unfastened 10 to 14 V
      Driver seat belt is fastened Below 1 V

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

  2. CHECK MULTI-DISPLAY 
    Fig 2: Identifying Multi-Display Connector
    G05298439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K46 multi-display connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      K46-10 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K46-3 (IG) - K46-10 (GND1) B - W-B Engine switch signal Engine switch off Below 1 V
      Engine switch on (IG) 10 to 14 V
      K46-1 (+B1) - Body ground O - Body ground Battery Always 10 to 14 V

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

    3. Reconnect the K46 multi-display connector.
    4. Measure the voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      K46-21 (PBEW) - Body ground V - Body ground Seat belt warning light signal (for passenger side) Passenger seat is occupied and its seat belt is unfastened Alternating between 10 to 14 V and below 1 V
      Passenger seat is occupied and its seat belt is fastened Below 1 V

      If the result is not as specified, the multi-display may have a malfunction.

  3. CENTER AIRBAG SENSOR 
    Fig 3: Identifying Center Airbag Sensor Connector Terminals
    G05298069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CENTER AIRBAG SENSOR SPECIFICATIONS

    Terminal No. Terminal Symbol Destination
    U13-9 FSR+ Occupant classification ECU
    U13-17 FSR- Occupant classification ECU
    V16-15 LBE+ Front seat inner belt assembly LH
  4. CHECK OCCUPANT CLASSIFICATION ECU 
    Fig 4: Identifying Occupant Classification ECU Connector Terminals
    G05298257Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    a17-5 (GND) - Body ground W-B - Body ground Occupant classification ECU ground line Always Below 1 Ω
    a17-6 (PS) - a17-15 (GPS) P - V Pressure sensor signal line Engine switch on (IG) 0 to 5 V
    a17-7 (VPS) - a17-5 (GND) R - W-B Pressure sensor +B line Engine switch on (IG) 4.75 to 5.25 V
    a17-8 (GBT) - a17-5 (GND) GR - W-B Belt tension sensor ground line Always Below 1 Ω
    a17-9 (IG) - a17-5 (GND) L - W-B Occupant classification ECU +B line Engine switch on (IG) 10 to 14 V
    a17-10 (DIA) - a17-5 (GND) R - W-B Diagnosis (DLC3) Engine switch on (IG) Pulse generation
    a17-11 (FSR+) - a17-12 (FSR-) L - P Center airbag sensor communication line Engine switch on (IG) Pulse generation
    a17-12 (FSR-) - a17-5 (GND) P - W-B Center airbag sensor communication ground line Always Below 1 Ω
    a17-13 (BSW) - a17-14 (BGND) W - Y Passenger side buckle switch line Engine switch on (IG) Low: 4 to 7 mA
    Hi: 12 to 18 mA
    a17-14 (BGND) - a17-5 (GND) Y - W-B Passenger side buckle switch ground line Always Below 1 Ω
    a17-15 (GPS) - a17-5 (GND) V - W-B Pressure sensor ground line Always Below 1 Ω
    a17-16 (BT) - a17-5 (GND) BR - W-B Belt tension sensor signal line Engine switch on (IG) 0 to 5 V
    a17-17 (VBT) - a17-5 (GND) G - W-B Belt tension sensor +B line Engine switch on (IG) 4.75 to 5.25 V
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