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

    B007WU5C25
    *A for LHD *B for RHD

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

      Click here

    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
      MB-13 (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
      MB-2 (RCTY) - Body ground* - Rear door courtesy light switch RH input Rear door RH closed (OFF) 10 kΩ or higher
      Rear door RH open (ON) Below 1 Ω

      • *: w/ Rear Seat Belt Warning

  2. CHECK COMBINATION METER ASSEMBLY

    B005O4QN16

    1. Disconnect the J10 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
      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
      J10-7 (PODS) - Body ground

      LG - Body ground*1

      L - Body ground*2

      		 Occupant detection sensor signal Front passenger seat occupied Below 100 Ω
      Front passenger seat not occupied 1 MΩ or higher
      J10-14 (RLSB) - Body ground*3 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*3 B - Body ground Rear center seat belt buckle switch signal Rear center seat belt fastened 10 kΩ or higher
      Rear center seat belt fastened Below 1 Ω
      J10-12 (RRSB) - Body ground*3 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
      J10-8 (RLBT) - Body ground*3, *4 R - Body ground Rear No. 2 LH seat belt buckle switch signal Rear No. 2 LH seat belt fastened 10 kΩ or higher
      Rear No. 2 LH seat belt unfastened Below 1 Ω
      J10-6 (RRBT) - Body ground*3, *4 W - Body ground Rear No. 2 RH seat belt buckle switch signal Rear No. 2 RH seat belt fastened 10 kΩ or higher
      Rear No. 2 RH seat belt unfastened Below 1 Ω

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Rear Seat Belt Warning

      • *4: w/ Rear No. 2 Seat

    3. Reconnect the J10 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
      J10-35 (RLMT) - Body ground*1 Y - Body ground Rear seat belt warning light (LH) output signal Engine switch on (IG), rear seat belt warning light (LH) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (LH) on Below 1 V
      J10-36 (RCMT) - Body ground*1 W - Body ground Rear seat belt warning light (center) output signal Engine switch on (IG), rear seat belt warning light (center) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (center) on Below 1 V
      J10-37 (RRMT) - Body ground*1 B - Body ground Rear seat belt warning light (RH) output signal Engine switch on (IG), rear seat belt warning light (RH) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (RH) on Below 1 V
      J10-32 (L) - Body ground*1, *2 L - Body ground Rear seat belt warning light (rear No. 2 seat LH) output signal Engine switch on (IG), rear seat belt warning light (rear No. 2 seat LH) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (rear No. 2 seat LH) on Below 1 V
      J10-33 (SW) - Body ground*1, *2 R - Body ground Rear seat belt warning light (rear No. 2 seat RH) output signal Engine switch on (IG), rear seat belt warning light (rear No. 2 seat RH) off 11 to 14 V
      Engine switch on (IG), rear seat belt warning light (rear No. 2 seat RH) on Below 1 V

      • *1: w/ Rear Seat Belt Warning

      • *2: w/ Rear No. 2 Seat

  3. CHECK AIRBAG SENSOR ASSEMBLY

    B005PQWN73
    for LHD
    Terminal No. (Symbol) Terminal Symbol Destination
    S9-10 LBE+ Front seat inner belt assembly (driver seat)
    S9-18 LBE- Front seat inner belt assembly (driver seat)
    R9-15 RBE+ Front seat inner belt assembly (front passenger seat)
    R9-23 RBE- Front seat inner belt assembly (front passenger seat)
    for RHD
    Terminal No. (Symbol) Terminal Symbol Destination
    R9-15 RBE+ Front seat inner belt assembly (driver seat)
    R9-23 RBE- Front seat inner belt assembly (driver seat)
    S9-10 LBE+ Front seat inner belt assembly (front passenger seat)
    S9-18 LBE- Front seat inner belt assembly (front passenger seat)