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Terminals Of Ecu

  1. CHECK INSTRUMENT PANEL J/B ASSEMBLY (BODY ECU) 
    1. Disconnect the B4 and B6 ECU connectors.
      Fig 1: Identifying B4 And B6 ECU Connectors
      G04115333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 1D, 1F and 1M J/B connectors.
    3. Measure the voltage and resistance according to the value(s) in the table below.

      Standard resistance 

      TERMINAL SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BECU (1D-10) - Body ground W - Body ground +B (BECU) power supply Constant 10 to 14 V
      GND1 (1F-10) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      GND2 (1M-9) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      DCTY (B6-14) - Body ground L - Body ground Driver door courtesy switch input Driver door CLOSED --> OPEN 10 kΩ or higher --> Below 1 Ω
      KSW (B4-21) - Body ground B - Body ground Key unlock warning switch input No key in ignition key cylinder --> Key inserted 10 kΩ or higher --> Below 1 Ω

      HINT:

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

    4. Reconnect the 1D, 1F, 1M, B4 and B6 connectors.
    5. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TERMINAL SPECIFICATIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      DCTY (B6-14) - Body ground L - Body ground Driver door courtesy switch input Driver door CLOSED --> OPEN 10 to 14 --> 0 V
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