SEAT BELT WARNING SYSTEM TERMINALS OF ECU


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

    B0077UOE06

    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
      O2-6 (FLCY) - Body ground* - Front door courtesy light switch LH input Front door LH closed (OFF) 10 kΩ or higher
      O2-6 (FLCY) - Body ground* - Front door courtesy light switch LH input Front door LH open (ON) Below 1 Ω
      O2-27 (FRCY) - Body ground* - Front door courtesy light switch RH input Front door RH closed (OFF) 10 kΩ or higher
      O2-27 (FRCY) - Body ground* - Front door courtesy light switch RH input Front door RH open (ON) Below 1 Ω

      • *: w/ Rear Seat Belt Warning

  2. CHECK COMBINATION METER ASSEMBLY

    A01FAWXN09

    1. Disconnect the O3 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
      O3-22 (B) - Body ground LG - Body ground Battery power supply Always 11 to 14 V
      O3-21 (IG+) - Body ground B - Body ground Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V
      O3-31 (ES) - Body ground BR - Body ground Ground Always Below 1 Ω
      O3-6 (PBKL) - Body ground P - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt fastened 10 kΩ or higher
      O3-6 (PBKL) - Body ground P - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt unfastened Below 1 Ω
      O3-7 (PODS) - Body ground V - Body ground Occupant detection sensor signal Front passenger seat occupied Below 100 Ω
      O3-7 (PODS) - Body ground V - Body ground Occupant detection sensor signal Front passenger seat not occupied 1 MΩ or higher
      O3-14 (RLSB) - Body ground* G - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt fastened 10 kΩ or higher
      O3-14 (RLSB) - Body ground* G - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt unfastened Below 1 Ω
      O3-12 (RRSB) - Body ground* R - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt fastened 10 kΩ or higher
      O3-12 (RRSB) - Body ground* R - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt unfastened Below 1 Ω

      • *: w/ Rear Seat Belt Warning

  3. CHECK AIRBAG ECU ASSEMBLY

    A01FB1NN56
    Terminal No. (Symbol) Terminal Symbol Destination
    U9-23*1 LBE- Front seat inner belt assembly (driver seat)
    U9-15*1 LBE+ Front seat inner belt assembly (driver seat)
    T31-10*2 RBE+ Front seat inner belt assembly (driver seat)
    T31-18*2 RBE- Front seat inner belt assembly (driver seat)

    • *1: for LHD

    • *2: for RHD