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Terminals Of Ecu

  1. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 
    Fig 1: Identifying Main Body ECU RH (Cowl Side Junction Block RH) Connector Terminals
    G05310967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DA, DD, DK, DM, K68 and U1 ECU connectors.
    2. Measure the resistance and voltage of the wire harness side connectors.
      ECU TERMINAL REFERENCE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      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
      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 Power switch OFF Below 1 V
      Power switch ON (ACC) 10 to 14 V
      IG (DM-1) - GND2 (DD-7) B - W-B IG power supply Power switch OFF Below 1 V
      Power switch ON (IG) 10 to 14 V
      DCTY (U1-14) - Body ground R - Body ground Driver side door courtesy light switch input Driver side door open Below 1 Ω
      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
      Passenger side door closed 10 kΩ or higher
      RCTY (U1-16) - Body ground L - Body ground Rear RH side door courtesy light switch input Rear RH side door open Below 1 Ω
      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
      Rear LH side door closed 10 kΩ or higher

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

    3. Reconnect the DA, DD, DK, DM, K68 and U1 ECU connectors.
    4. Measure the voltage of the wire harness side connectors.
      ECU TERMINAL REFERENCE CHART

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

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

  2. CHECK CERTIFICATION ECU 
    Fig 2: Identifying Certification ECU Connector Terminals
    G05299200Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U28 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      ECU TERMINAL REFERENCE CHART

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

      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.
      ECU TERMINAL REFERENCE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      RSSI (U28-39) - E (U28-17) O - W-B Door control receiver output signal Power switch OFF, all doors closed and transmitter switch not pressed 10 to 14 V
      Power switch OFF, all doors closed and transmitter switch pressed Below 1 V
      RDA (U28-38) - E (U28-17) G - W-B Door control receiver output signal Power switch OFF, all doors closed and transmitter switch not pressed 10 to 14 V
      Power switch OFF, all doors closed and transmitter switch pressed Pulse generation
      ASEL (U28-37) - E (U28-17) SB - W-B Change of door control receiver (door to luggage compartment) All doors closed and transmitter LUGGAGE switch not pressed Below 1 V
      All doors closed and transmitter LUGGAGE switch pressed 4.6 to 5.4 V
      RCO (U28-29) - E (U28-17) P - W-B Supply battery to door control receiver Always 4.6 to 5.4 V

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

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