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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> Restraints >> Seat Belts >> Seat Belt Warning System (Except Hybrid) - Diagnostics & Symptom Tests >> SEAT BELT WARNING SYSTEM (for Gasoline Model) >> Terminals Of Ecu [06/2018 - 07/2019] >> Terminals Of Ecu [06/2018 - 07/2019]

Terminals Of Ecu [06/2018 - 07/2019]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    Fig 1: Main Body ECU (Multiplex Network Body ECU) And Instrument Panel Junction Block Assembly [06/2018 - 07/2019]
    GTY820038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

      Refer to REMOVAL [06/2018 - 08/2021]

    2. Reconnect the instrument panel junction block assembly connectors.
    3. Measure the resistance and voltage according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      MB-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Engine power supply (IG signal) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      MB-30 (ACC) - Body ground - Engine power supply (ACC signal) Engine switch on (ACC) 11 to 14 V
      Engine switch off Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-2 (RCTY) - Body ground - Rear door courtesy light switch RH input Rear door RH closed (OFF) 10 kΩ or higher
      Rear door RH open (on (IG)) Below 1 Ω
      MB-13 (LCTY) - Body ground - Rear door courtesy light switch LH input Rear door LH closed (OFF) 10 kΩ or higher
      Rear door LH open (on (IG)) Below 1 Ω
  2. CHECK COMBINATION METER ASSEMBLY 
    Fig 2: Combination Meter Assembly [06/2018 - 07/2019]
    GTY797386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G17 combination meter assembly connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G17-22 (B) - Body ground LA-B - Body ground Battery power supply Always 11 to 14 V
      G17-21 (IG+) - Body ground LA-GR Body ground Engine power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      G17-31 (ES) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G17-14 (RLSB) - Body ground SB - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt fastened 10 kΩ or higher
      Rear LH seat belt unfastened Below 1 Ω
      G17-12 (RRSB) - Body ground LG - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt fastened 10 kΩ or higher
      Rear RH seat belt unfastened Below 1 Ω
      G17-13 (RCSB) - Body ground B - Body ground Rear center seat belt buckle switch signal Rear center seat belt fastened 10 kΩ or higher
      Rear center seat belt unfastened Below 1 Ω
  3. AIRBAG SENSOR ASSEMBLY 
    Fig 3: Airbag Sensor Assembly [06/2018 - 07/2019]
    GTY790101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Terminal No. Terminal Symbol Destination
    N34-28 LBE+ Front seat inner belt assembly LH
    N34-27 LBE- Front seat inner belt assembly LH
  4. CHECK OCCUPANT DETECTION ECU 
    Fig 4: Occupant Detection ECU [06/2018 - 07/2019]
    GTY792945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U28-10 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
      U28-6 (IG2) - U28-10 (GND) B - W-B Power source Engine switch on (IG) 11 to 14 V
      U28-9 (BGND) - U28-10 (GND) P - W-B Front passenger buckle switch ground Always Below 1 V
      U28-7 (BSW) - U28-9 (BGND) G - P Front passenger buckle switch signal Always Pulse generation
      U29-1 (SVC1) - U29-5 (SGD1) R - G Front occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      U29-2 (SVC3) - U29-6 (SGD3) GR - W Rear occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      U29-3 (SIG1) - U29-5 (SGD1) P - G Front occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      U29-4 (SIG3) - U29-6 (SGD3) SB - W*1
      Y - W*2      		 Rear occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      U29-5 (SGD1) - U28-10 (GND) G - W-B Front occupant classification sensor LH ground Always Below 1 V
      U29-6 (SGD3) - U28-10 (GND) W - W-B Rear occupant classification sensor LH ground Always Below 1 V
      1. *1: TMC Made
      2. *2: TMMK Made
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