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Terminals Of Ecu [04/2014 - 08/2017]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND DRIVER SIDE JUNCTION BLOCK ASSEMBLY 
    Fig 1: Main Body ECU (multiplex Network Body ECU) And Driver Side Junction Block Assembly Connector End Views
    GTY438294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

      Refer to REMOVAL [08/2013 - ]

    2. Measure the resistance and voltage according to the value(s) in the table below.

      HINT: 

      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-32 (IG) - Body ground - Ignition power supply (IG signal) Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      MB-29 (ACC) - Body ground - Ignition power supply (ACC signal) Ignition switch off Below 1 V
      Ignition switch ACC 11 to 14 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

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

  2. CHECK COMBINATION METER ASSEMBLY 
    Fig 2: Combination Meter Assembly Connector End View
    GTY428790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E43 combination meter assembly connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      E43-39 (IG+) - Body ground P - Body ground Ignition power supply (IG signal) Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      E43-21 (ET) - Body ground BR - Body ground Ground Always Below 1 Ω
      E43-7 (P/SB) - Body ground GR - 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

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

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