SEAT BELT WARNING SYSTEM(w/ Occupant Classification System) TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY

    B006DW9E03

    1. Disconnect the G34 combination meter assembly connector.

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

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G34-22 (B) - Body ground LA-B - Body ground Battery power supply Always 11 to 14 V
      G34-21 (IG+) - Body ground LA-G - Body ground Ignition power supply Engine switch on (IG) 11 to 14 V
      G34-31 (ES) - Body ground LA - Body ground Ground Always Below 1 Ω
      G34-14 (RLSB) - Body ground LG - 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
      G34-12 (RRSB) - Body ground SB - 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
      G34-13 (RCSB) - Body ground P - 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. Reconnect the G34 combination meter assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G34-24 (RLMT) - Body ground L - Body ground Rear LH seat belt warning light output signal Engine switch on (IG), rear LH seat belt warning light off 11 to 14 V
      Engine switch on (IG), rear LH seat belt warning light on Below 1 V
      G34-27 (RCMT) - Body ground LG - Body ground Rear center seat belt warning light output signal Engine switch on (IG), rear center seat belt warning light off 11 to 14 V
      Engine switch on (IG), rear center seat belt warning light on Below 1 V
      G34-28 (RRMT) - Body ground W - Body ground Rear RH seat belt warning light output signal Engine switch on (IG), rear RH seat belt warning light off 11 to 14 V
      Engine switch on (IG), rear RH seat belt warning light on Below 1 V

  2. CHECK AIRBAG ECU ASSEMBLY

    B006GN6N12
    Terminal No. Terminal Symbol Destination
    L37-28 LBE+ Front seat inner belt assembly LH
    L37-27 LBE- Front seat inner belt assembly LH

  3. CHECK OCCUPANT DETECTION ECU

    B006DD2E25

    1. Measure the resistance, voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q42-1 (SVC1) - Q42-5 (SGD1) R - B Front occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      Q42-2 (SVC3) - Q42-6 (SGD3) L - GR Rear occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      Q42-3 (SIG1) - Q42-5 (SGD1) Y - B Front occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      Q42-4 (SIG3) - Q42-6 (SGD3) LG - GR Rear occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      Q42-5 (SGD1) - Q41-10 (GND) B - W-B Front occupant classification sensor LH ground Always Below 1 Ω
      Q42-6 (SGD3) - Q41-10 (GND) GR - W-B Rear occupant classification sensor LH ground Always Below 1 Ω
      Q41-6 (IG) - Q41-10 (GND) G - W-B Power source Engine switch on (IG) 11 to 14 V
      Q41-7 (BSW) - Q41-9 (BGND) L - BR Front passenger side buckle switch signal Always Pulse generation
      Q41-9 (BGND) - Q41-10 (GND) BR - W-B Front passenger side buckle switch ground Always Below 1 Ω
      Q41-10 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω