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Terminals Of Ecu

  1. CHECK COWL SIDE JUNCTION BLOCK RH ASSEMBLY (MULTIPLEX NETWORK BODY ECU) 
    Fig 1: Identifying DA, DD, DK, DM Junction Block And K68 And U1 ECU Connector Terminals
    G05299199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DA, DD, DK and DM junction block connectors.
    2. Disconnect the K68 and U1 ECU connectors.
    3. Measure the resistance and voltage of the wire harness side connectors.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BECU (DK-5) - GND2 (DD-7) G-R - W-B BECU power supply Always 10 to 14 V
      ACC (DM-1) - GND2 (DD-7) B - W-B ACC power supply Always 10 to 14 V
      IG (DM-1) - GND2 (DD-7) B - W-B IG power supply Always 10 to 14 V
      DTCY (U1-14) - Body ground R - Body ground Driver side door courtesy light switch input Driver side door open Below 1 Ω
      DTCY (U1-14) - Body ground R - Body ground Driver side door courtesy light switch input Driver side door closed 10 kΩ or higher
      PCTY (K68-23) - Body ground R - Body ground Passenger side door courtesy light switch input Passenger side door open Below 1 Ω
      PCTY (K68-23) - Body ground R - Body ground Passenger side door courtesy light switch input Passenger side door closed 10 kΩ or higher
      RCTY (U1-16) - Body ground G - Body ground Rear RH side door courtesy light switch input Rear RH side door open Below 1 Ω
      RCTY (U1-16) - Body ground G - Body ground Rear RH side door courtesy light switch input Rear RH side door closed 10 kΩ or higher
      LCTY (DA-11) - Body ground G - Body ground Rear LH side door courtesy light switch input Rear LH side door open Below 1 Ω
      LCTY (DA-11) - Body ground G - Body ground Rear LH side door courtesy light switch input Rear LH side door closed 10 kΩ or higher
      GND2 (DD-7) - Body ground W-B - Body ground Ground Always Below 1 Ω
      GND2 (DA-5) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    4. Reconnect the DA, DD, DK and DM junction connectors.
    5. Reconnect the K68 and U1 ECU connectors.
    6. Measure the voltage of the wire harness side connectors.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      HAZ (K67-2) - Body ground O - Body ground Hazard warning light drive Answer-back ON Pulse generation
      HAZ (K67-2) - Body ground O - Body ground Hazard warning light drive Answer-back OFF 10 to 14 V
      BZR (A39-2) - Body ground G - Body ground Wireless warning buzzer drive Answer-back ON Pulse generation
      BZR (A39-2) - Body ground G - Body ground Wireless warning buzzer drive Answer-back OFF 10 to 14 V

      If the result is not as specified, the Junction Block (ECU) may have a malfunction.

  2. CHECK CERTIFICATION ECU ASSEMBLY 
    Fig 2: Identifying U28 ECU Certification Assembly Connector Terminals
    G05299200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U28 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B1 (U28-1) - E (U28-17) G - W-B Battery power supply Always 10 to 14 V
      IG (U28-18) - E (U28-17) B - W-B IG power supply Engine switch on (IG) 10 to 14 V
      IG (U28-18) - E (U28-17) B - W-B IG power supply Engine switch off Below 1 V
      E (U28-17) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the U28 ECU connector.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      RSS1 (U28-39) - E (U28-17) O - W-B Door control receiver output signal Engine switch off, all doors closed and transmitter switch not pressed 10 to 14 V
      RSS1 (U28-39) - E (U28-17) O - W-B Door control receiver output signal Engine switch off, all doors closed and transmitter switch pressed Below 1 V
      RDA (U28-38) - E (U28-17) LG - W-B Door control receiver output signal Engine switch off, all doors closed and transmitter switch not pressed 10 to 14 V
      RDA (U28-38) - E (U28-17) LG - W-B Door control receiver output signal Engine switch off, all doors closed and transmitter switch pressed Pulse generation

      If the result is not as specified, the ECU may have a malfunction.

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