SEAT BELT WARNING SYSTEM TERMINALS OF ECU


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


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

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      B003YD6N15

    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.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      MB-31 (BECU) - Body ground - Auxiliary battery power supply Power switch off 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply (IG signal) Power switch on (IG) → off 11 to 14 V → Below 1 V
      MB-30 (ACC) - Body ground - Ignition power supply (ACC signal) Power switch on (ACC) → off 11 to 14 V → Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-13 (LCTY) - Body ground* - Rear door courtesy light switch LH input Rear door LH closed (OFF) 10 kΩ or higher
      MB-13 (LCTY) - Body ground* - Rear door courtesy light switch LH input Rear door LH open (ON) Below 1 Ω
      MB-2 (RCTY) - Body ground* - Rear door courtesy light switch RH input Rear door RH closed (OFF) 10 kΩ or higher
      MB-2 (RCTY) - Body ground* - Rear door courtesy light switch RH input Rear door RH open (ON) Below 1 Ω

      • *: w/ Rear Seat Belt Warning

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

  2. CHECK COMBINATION METER ASSEMBLY


    1. Disconnect the K3 combination meter assembly connector.

      B003Y7VN05

    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.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      K3-22 (B) - Body ground LG - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      K3-21 (IG+) - Body ground B - Body ground Ignition power supply (IG signal) Power switch on (IG) → off 11 to 14 V → Below 1 V
      K3-31 (ES) - Body ground BR - Body ground Ground Always Below 1 Ω
      K3-6 (PBKL) - Body ground P - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt fastened 10 kΩ or higher
      K3-6 (PBKL) - Body ground P - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt unfastened Below 1 Ω
      K3-7 (PODS) - Body ground V - Body ground Occupant detection sensor signal Front passenger seat occupied Below 100 Ω
      K3-7 (PODS) - Body ground V - Body ground Occupant detection sensor signal Front passenger seat not occupied 1 MΩ or higher
      K3-14 (RLSB) - Body ground* G - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt fastened 10 kΩ or higher
      K3-14 (RLSB) - Body ground* G - Body ground Rear LH seat belt buckle switch signal Rear LH seat belt unfastened Below 1 Ω
      K3-13 (RCSB) - Body ground* W - Body ground Rear center seat belt buckle switch signal Rear center seat belt fastened 10 kΩ or higher
      K3-13 (RCSB) - Body ground* W - Body ground Rear center seat belt buckle switch signal Rear center seat belt unfastened Below 1 Ω
      K3-12 (RRSB) - Body ground* R - Body ground Rear RH seat belt buckle switch signal Rear RH seat belt fastened 10 kΩ or higher
      K3-12 (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

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

  3. CHECK AIRBAG SENSOR ASSEMBLY

    B003YDIN29
    Terminal No. Terminal Symbol Destination
    Q9-23*1 LBE- Front seat inner belt assembly (driver seat)
    Q9-15*1 LBE+ Front seat inner belt assembly (driver seat)
    P31-10*2 RBE+ Front seat inner belt assembly (driver seat)
    P31-18*2 RBE- Front seat inner belt assembly (driver seat)

    • *1: for LHD

    • *2: for RHD