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


  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B005PPOC26

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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    2. Reconnect the instrument panel junction block assembly connectors.

    3. 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
      MB-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V
      MB-30 (ACC) - Body ground - Ignition power supply (ACC signal) Engine switch on (ACC) → off 11 to 14 V → Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      2D-24 (LCTY) - Body ground - Rear door courtesy light switch LH input Rear door LH closed (OFF) 10 kΩ or higher
      Rear door LH open (ON) Below 1 Ω
      2A-31 (RCTY) - Body ground - Front door courtesy light switch RH input Rear door RH closed (OFF) 10 kΩ or higher
      Rear door RH open (ON) Below 1 Ω

  2. CHECK COMBINATION METER ASSEMBLY

    A01VVV7N05

    1. Disconnect the J10 combination meter assembly connector.

    2. Measure the voltage and resistance 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
      J10-22 (B) - Body ground G - Body ground Battery power supply Always 11 to 14 V
      J10-21 (IG+) - Body ground GR - Body ground Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V
      J10-31 (ES) - Body ground W-B - Body ground Ground Always Below 1 Ω
      J10-14 (RLSB) - Body ground R - 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
      J10-13 (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
      J10-12 (RRSB) - Body ground W - 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

  3. CHECK AIRBAG SENSOR ASSEMBLY

    A01VV9DN75
    Terminal No. Terminal Symbol Destination
    S9-10 LBE+ Front seat inner belt assembly LH
    S9-18 LBE- Front seat inner belt assembly LH

  4. CHECK OCCUPANT DETECTION ECU

    A01VUKKN20

    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
      B-10 (GND) - Body ground - Ground Always Below 1 V
      B-6 (IG2) - B-10 (GND) - Power source Engine switch on (IG) 11 to 14 V
      B-9 (BGND) - B-10 (GND) - Front passenger buckle switch ground Always Below 1 V
      B-7 (BSW) - B-9 (BGND) - Front passenger buckle switch signal Always Pulse generation
      b10-1 (SVC1) - b10-5 (SGD1) R - G Front occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      b10-2 (SVC3) - b10-6 (SGD3) GR - W Rear occupant classification sensor LH power supply Engine switch on (IG) 11 to 14 V
      b10-3 (SIG1) - b10-5 (SGD1) P - G Front occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      b10-4 (SIG3) - b10-6 (SGD3) SB - W Rear occupant classification sensor LH signal Engine switch on (IG) Pulse generation
      b10-5 (SGD1) - B-10 (GND) G - - Front occupant classification sensor LH ground Always Below 1 V
      b10-6 (SGD3) - B-10 (GND) W - - Rear occupant classification sensor LH ground Always Below 1 V