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


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

    B006H6ZN19

    1. Disconnect the main body ECU (multiplex network body ECU) connectors.

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    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
      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-18 (DBKL) - Body ground - Driver seat belt buckle switch signal Driver seat belt fastened 10 kΩ or higher
      Driver seat belt unfastened Below 1 Ω
      MB-2 (RCTY) - Body ground - Rear door courtesy light switch RH input Rear door LH closed (OFF) 10 kΩ or higher
      Rear door LH open (ON) Below 1 Ω
      MB-13 (LCTY) - Body ground - Rear door courtesy light switch LH input Rear door RH closed (OFF) 10 kΩ or higher
      Rear door RH open (ON) Below 1 Ω

  2. CHECK COMBINATION METER ASSEMBLY

    A003P49N25

    1. Disconnect the I6 meter circuit plate 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
      I6-22 (B) - Body ground W*1, GR*2 - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      I6-21 (IG+) - Body ground G - Body ground Ignition power supply (IG signal) Power switch on (IG) → off 11 to 14 V → Below 1 V
      I6-28 (ES) - Body ground W- B - Body ground Ground Always Below 1 Ω
      I6-14 (PBKL) - Body ground L - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt fastened 10 kΩ or higher
      Front passenger seat occupied, seat belt unfastened Below 1 Ω
      I6-13 (PODS) - Body ground G - Body ground Occupant detection sensor signal Front passenger seat occupied Below 100 Ω
      Front passenger seat not occupied 1 MΩ or higher
      I6-12 (RLSB) - Body ground GR - 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
      I6-10 (RRSB) - Body ground P - 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

      • *1: for LHD

      • *2: for RHD