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Terminals Of Ecu

  1. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 
    Fig 1: Identifying Main Body ECU (Instrument Panel Junction Block) Terminals (1 Of 2)
    G05402685Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Main Body ECU (Instrument Panel Junction Block) Terminals (2 Of 2)
    G05402686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 4B and 4E junction block connectors.
    2. Measure the resistance and voltage of the wire harness side connectors.
      RESISTANCE AND VOLTAGE SPECIFICATION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4E-17 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      4B-30 (BECU) - 4E-17 (GND1) L - W-B Battery (power supply) Always 11 to 14 V

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

    3. Reconnect the 4B and 4E junction block connectors.
    4. Measure the voltage of the wire harness side connectors.
      VOLTAGE SPECIFICATION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4D-7 (KSW) - Body ground Y - Body ground Key unlock warning switch input Key inserted 11 to 14 V
      No key in ignition key cylinder Below 1 V
      4A-21 (DCTY) - Body ground R - Body ground Driver side door courtesy light switch input Driver side door closed 11 to 14 V
      Driver side door open Below 1 V
      4A-24 (PCTY) - Body ground L - Body ground Passenger side door courtesy light switch input Passenger side door closed 11 to 14 V
      Passenger side door open Below 1 V
      4A-5 (RRTY) - Body ground G - Body ground Rear LH door courtesy light switch input Rear LH door closed 11 to 14 V
      Rear LH door open Below 1 V
      4A-20 (RRTY) - Body ground L - Body ground Rear RH door courtesy light switch input Rear RH door closed 11 to 14 V
      Rear RH door open Below 1 V
      4A-7 (BCTY) - Body ground SB - Body ground Back door courtesy switch input Back side door closed 11 to 14 V
      Back side door open Below 1 V
      4H-4 (L1) - Body ground LG - Body ground Door lock motor LOCK drive output Master switch (door control switch) OFF Below 1 V
      Master switch (door control switch) ON (LOCK) 11 to 14 V → Below 1 V
      4E-11 (L1)- Body ground BR - Body ground Door lock motor LOCK drive output Passenger side door control switch OFF Below 1 V
      Passenger side door control switch ON (LOCK) 11 to 14 V → Below 1 V
      4H-5 (UL1) - Body ground O - Body ground Door lock motor UNLOCK drive output Master switch (door control switch) OFF Below 1 V
      Master switch (door control switch) ON (UNLOCK) 11 to 14 V → Below 1 V
      4C-10 (UL1) - Body ground O - Body ground Door lock motor UNLOCK drive output Passenger side door control switch OFF Below 1 V
      Passenger side door control switch ON (UNLOCK) 11 to 14 V → Below 1 V
      F38-2 (ACTD) - Body ground SB - Body ground Front door lock motor LH 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) 11 to 14 V → Below 1 V
      4H-8 (ACT+) - Body ground O - Body ground Door lock motor LOCK drive output Master switch (door control switch) or driver side door key cylinder OFF Below 1 V
      4H-17 (ACT+) - Body ground W - Body ground
      4A-3 (ACT+) - Body ground GR - Body ground Master switch (door control switch) or driver side door key cylinder ON (LOCK) 11 to 14 V → Below 1 V
      4H-18 (ACT-) - Body ground 4A-4 (ACT-) - Body ground P - 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) 11 to 14 V → Below 1 V
      F38-21 (LSWD) - Body ground L - Body ground Driver side door lock position switch input Driver side door UNLOCK Below 1 V
      Driver side door LOCK 11 to 14 V
      F38-5 (LSWP) - Body ground L - Body ground Passenger side door lock position switch input Passenger side door UNLOCK Below 1 V
      Passenger side door LOCK 11 to 14 V
      F38-14 (UL3) - Body ground Y - Body ground Front door lock LH key switch input Driver side door key cylinder OFF Below 1 V
      Driver side door key cylinder ON (UNLOCK) 11 to 14 V → Below 1 V
      4H-7 (L2) - Body ground BR - Body ground Front door lock LH key switch input Master switch or driver side door key cylinder OFF Below 1 V
      Master switch or driver side door key cylinder ON (LOCK) 11 to 14 V → Below 1 V
      F38-7 (BDSU) - Body ground Y - Body ground Back door opener switch signal input Back door opener switch OFF Below 1 V
      Back door opener switch ON 11 to 14 V → Below 1 V
      F38-1 (TR+) - Body ground O - Body ground Back door lock motor drive output Back door opener switch OFF Below 1 V
      Back door opener switch ON 11 to 14 V → Below 1 V

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

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