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Terminals Of Ecu

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  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU) 
    Fig 1: Identifying Terminals Of ECU - Instrument Panel Junction Block (Main Body ECU) Vehicle Rear Side
    G05586129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Terminals Of ECU - Instrument Panel Junction Block (Main Body ECU) Vehicle Front Side
    G05586130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the IB and IE junction block connectors.
    2. Measure the resistance and voltage of the wire harness side connectors.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND1 (IE-17) - Body ground W-B - Body ground Ground Always Below 1 Ω
      BECU (IB-30) - GND1 (IE-17) R - W-B Battery (power supply) Always 10 to 14 V

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

    3. Reconnect the IB and IE junction block connectors.
    4. Measure the voltage of the wire harness side connectors.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (IE-26) - GND1 (IE-17) L - W-B Key unlock warning switch input Key inserted 10 to 14 V
      No key in ignition key cylinder Below 1 V
      DCTY (IA-21) - Body ground W - Body ground Driver side door courtesy switch input Driver side door closed 10 to 14 V
      Driver side door open Below 1 V
      PCTY (IC-14) - Body ground BR - Body ground Passenger side door courtesy switch input Passenger side door closed 10 to 14 V
      Passenger side door open Below 1 V
      RRCY (ID-7) - Body ground LG - Body ground Rear RH door courtesy switch input Rear RH door closed 10 to 14 V
      Rear RH door open Below 1 V
      LCTY (E15-8) - Body ground SB - Body ground Rear LH door courtesy switch input Rear LH door closed 10 to 14 V
      Rear LH door open Below 1 V
      BCTY (IA-7) - Body ground LG - Body ground Back door courtesy switch input Back side door closed 10 to 14 V
      Back side door open Below 1 V
      L1 (IH-4) - Body ground P - Body ground Door lock motor LOCK drive output Master switch (door control switch) OFF Below 1 V
      Master switch (door control switch) ON (LOCK) 10 to 14 V → Below 1 V
      UL1 (IH-5) - Body ground B - Body ground Door lock motor UNLOCK drive output Master switch (door control switch) OFF Below 1 V
      Master switch (door control switch) ON (UNLOCK) 10 to 14 V → Below 1 V
      ACTD (E15-5) - Body ground B - Body ground Door lock motor UNLOCK drive output Master switch (door control switch) or driver side door key cylinder OFF Below 1 V
      Master switch (door control switch) or driver side door key cylinder ON (UNLOCK) 10 to 14 V → Below 1 V
      ACT+ (IH-8) - Body ground R - Body ground Door lock motor LOCK drive output Master switch (door control switch) or driver side door key cylinder OFF Below 1 V
      Master switch (door control switch) or driver side door key cylinder ON (LOCK) 10 to 14 V → Below 1 V
      ACT- (IH-18) - Body ground B - Body ground Door lock motor UNLOCK drive output Master switch (door control switch) or driver side door key cylinder OFF Below 1 V
      Master switch (door control switch) or driver side door key cylinder ON (UNLOCK) 10 to 14 V → Below 1 V
      LSWD (E15-25) - Body ground Y - Body ground Driver side door lock position switch input Driver side door UNLOCK Below 1 V
      Driver side door LOCK 10 to 14 V
      LSWP (E15-10) - Body ground Y - Body ground Passenger side door lock position switch input Passenger side door UNLOCK Below 1 V
      Passenger side door LOCK 10 to 14 V
      UL3 (E15-9) - Body ground LG - Body ground Door lock motor UNLOCK drive output Driver side door key cylinder OFF Below 1 V
      Driver side door key cylinder ON (UNLOCK) 10 to 14 V → Below 1 V
      L2 (IH-7) - Body ground SB - Body ground Door lock motor LOCK drive output Master switch or driver side door key cylinder OFF Below 1 V
      Master switch or driver side door key cylinder ON (LOCK) 10 to 14 V → Below 1 V
      PRG (E17-6) - Body ground Y - Body ground Door control receiver output Transmitter switch ON → OFF (No key in ignition key cylinder, all doors closed) 6 to 7 V → Below 1 V → 6 to 7 V
      RDA (E17-5) - Body ground G - Body ground Door control receiver input Transmitter switch ON → OFF (No key in ignition key cylinder, all doors closed) Below 1 V → 6 to 7 V → Below 1 V
      HAZ (IS-17) - Body ground GR- Body ground Hazard warning light signal Answer-back ON Pulse generation
      Answer-back OFF Below 1 V
      BZR (E17-2) - Body ground L- Body ground Wireless door lock buzzer signal Answer-back ON Pulse generation
      Answer-back OFF Below 1 V

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

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