SEAT BELT WARNING SYSTEM TERMINALS OF ECU


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


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

      A01G8U8E06

    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
      MB-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-31 (ALTB) - 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-29 (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
      H9-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

  2. CHECK COMBINATION METER ASSEMBLY


    1. Disconnect the H14 combination meter assembly connector.

      A01G85CE15

    2. Measure the resistance 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
      H14-30 (ES) - Body ground BR - Body ground Ground Always Below 1 Ω
      H14-10 (PBKL) - Body ground V - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt fastened 10 kΩ or higher
      H14-10 (PBKL) - Body ground V - Body ground Front passenger seat belt buckle switch signal Front passenger seat occupied, seat belt unfastened Below 1 Ω

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

    3. Reconnect the H14 combination meter assembly connector.

    4. Measure the voltage according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      H14-22 (B) - Body ground W - Body ground Battery power supply Always 11 to 14 V
      H14-21 (IG+) - Body ground GR - Body ground

      Ignition power supply

      (IG signal)

      		 Engine switch off Below 1 V
      H14-21 (IG+) - Body ground GR - Body ground

      Ignition power supply

      (IG signal)

      		 Engine switch on (IG) 11 to 14 V

      If the result is not as specified, the combination meter assembly may have a malfunction.

  3. CHECK AIRBAG SENSOR ASSEMBLY

    A01G8JWE61
    Terminal No. Terminal Symbol Destination
    P2-10 LBE+ Front seat inner belt assembly LH
    P2-18 LBE- Front seat inner belt assembly LH