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Terminals Of Ecu

  1. CHECK MAIN BODY ECU 
    Fig 1: Identifying Terminals Of ECU Connector Terminal
    G05402389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Terminals Of ECU Connector Terminal
    G05402390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 4B, 4D and 4E main body ECU (vehicle rear side) connectors.
    2. Measure the resistance and voltages of the wire harness side connectors.

      Standard: 

      CONNECTOR TERMINAL REFERENCE

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4B-30 (BECU) - 4E-17 (GND1) L - W-B Battery (Power supply) Always 11 to 14 V
      4D-7 (KSW) - Body ground Y - Body ground Key unlock warning switch signal No key is in ignition key cylinder 10 kΩ or higher
      4D-7 (KSW) - Body ground Y - Body ground Key unlock warning switch signal Key is in ignition key cylinder Below 1 Ω
      4E-17 (GND1) - 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.

    3. Reconnect the main body ECU (vehicle rear side) connectors.
    4. Measure the voltages of the wire harness side connectors.

      Standard voltage: 

      STANDARD VOLTAGE SPECIFICATIONS

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4A-21 (DCTY) - Body ground R - Body ground Driver door courtesy light switch input Driver door closed 11 to 14 V
      4A-21 (DCTY) - Body ground R - Body ground Driver door courtesy light switch input Driver door open 0 V
      4A-24 (PCTY) - Body ground L - Body ground Front passenger door courtesy light switch input Passenger door closed 11 to 14 V
      4A-24 (PCTY) - Body ground L - Body ground Front passenger door courtesy light switch input Passenger door open 0 V
      4A-20 (RRTY) - Body ground L - Body ground Rear RH door courtesy light switch input Rear RH door closed 11 to 14 V
      4A-20 (RRTY) - Body ground L - Body ground Rear RH door courtesy light switch input Rear RH door open 0 V
      4A-5 (RRTY) - Body ground G - Body ground Rear LH door courtesy light switch input Rear LH door closed 11 to 14 V
      4A-5 (RRTY) - Body ground G - Body ground Rear LH door courtesy light switch input Rear LH door open 0 V
      4A-7 (BCTY) - Body ground SB- Body ground Back door courtesy switch input Back door closed 11 to 14 V
      4A-7 (BCTY) - Body ground SB- Body ground Back door courtesy switch input Back door open 0 V

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

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