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Terminals Of Ecu

  1. CHECK DRIVER SIDE J/B ASSEMBLY (MULTIPLEX NETWORK BODY ECU) 
    1. Disconnect the 1C, 1J, 1L, 1K, 1P, B6, B7 and B9 J/B connectors.
      Fig 1: Identifying 1C, 1J, 1L, 1K, 1P, B6, B7 And B9 J/B ECU Connectors Terminal
      G05140882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard 

      TERMINALS VOLTAGE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BECU (1L-7) - Body ground W-L - Body ground +B (BECU) power supply Always 10 to 14 V
      BECU (1C-24) - Body ground W-L - Body ground +B (BECU) power supply Always 10 to 14 V
      ALTB (1C-30) - Body ground B - Body ground +B (power system, generator system) power supply Always 10 to 14 V
      KSW (B6-21)-Body ground L-B - Body ground Key unlock warning switch input No key in ignition key cylinder → Key inserted 10 kΩ or higher → Below 1 Ω
      GND1 (1L-16) - Body ground W-B - Body ground Ground Always Below 1 Ω
      GND2 (1K-17) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L1 (1J-3) - Body ground R-Y - Body ground Passenger side door control switch LOCK input Passenger door control switch OFF Ω LOCK 10 kΩ or higher Ω Below 1 Ω
      UL1 (1J-4) - Body ground G - Body ground Passenger side door control switch UNLOCK input Passenger door control switch OFF Ω UNLOCK 10 kΩ or higher Ω Below 1 Ω
      L1 (1K-25) - Body ground R-Y - Body ground Passenger side door control switch LOCK input Passenger door control switch OFF Ω LOCK 10 kΩ or higher → Below 1 Ω
      UL1 (1K-22) - Body ground G - Body ground Passenger side door control switch UNLOCK input Passenger door control switch OFF Ω UNLOCK 10 kΩ or higher → Below 1 Ω
      L2 (1K-26) - Body ground LG - Body ground Driver side door key-linked LOCK input Driver side door key cylinder OFF → LOCK 10 kΩ or higher → Below 1 Ω
      L2 (1J-5) - Body ground LG - Body ground Passenger side door key-linked LOCK input Passenger side door key cylinder OFF → LOCK 10 kΩ or higher → Below 1 Ω
      UL3 (B9-8) - Body ground L - Body ground Driver side door key-linked UNLOCK input Driver side door key cylinder OFF → UNLOCK 10 kΩ or higher → Below 1 Ω
      UL2 (B7-4) - Body ground L-Y - Body ground Passenger side door key-linked LOCK input Passenger side door key cylinder OFF → UNLOCK 10 kΩ or higher → Below 1 Ω
      DCTY (B9-14) - Body ground R-Y - Body ground Driver side door courtesy switch input Driver door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω
      PCTY (B7-23) - Body ground R-Y - Body ground Passenger side door courtesy switch input Passenger door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω
      LCTY (1P-19) - Body ground GR - Body ground Rear left door courtesy switch input Rear left door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω
      RCTY (B9-16) - Body ground R-W - Body ground Rear right door courtesy switch input Rear right door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω
      BCTY (B7-25) - Body ground G-W - Body ground Back door courtesy switch input Back door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω
      BDSU (B7-3)*1 - Body ground G-B - Body ground Back door opener switch (outside handle switch) input Back door opener switch OFF → ON 10 kΩ or higher → Below 1 Ω
      HINT:
      • If the result is not as specified, there may be a malfunction on the wire harness side.
      • *1: w/o Power back door
    3. Reconnect the J/B and ECU connectors and measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TERMINALS VOLTAGE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (1A-1) - Body ground W - Body ground Ignition power supply Ignition switch OFF → ON 10 to 14 V → Below 1 V
      ACT+(1K-2)-Body ground L-R - Body ground Door lock motor LOCK drive output (Driver door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → LOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      ACT+ (1J-1) - Body ground L-R - Body ground Door lock motor LOCK drive output (Passenger door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → LOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      ACT+ (1P-17) - Body ground L-R - Body ground Door lock motor LOCK drive output (Rear left door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → LOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      TR+ (B6-1)*1 - Body ground L-B - Body ground Door lock motor LOCK drive output (Back door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → LOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      ACTD (B9-4) - Body ground W-R - Body ground Door lock motor UNLOCK drive output (Driver door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → UNLOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      ACT - (1J-2) - Body ground L-B - Body ground Door lock motor UNLOCK drive output (Passenger door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → UNLOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      ACT - (1P-6) - Body ground L-B - Body ground Door lock motor UNLOCK drive output (Rear left door) Door control switch (Master switch or passenger side switch) or driver side door key cylinder OFF → UNLOCK → OFF Below 1 V → 10 to 14 V → Below 1 V
      LSWD (B9-7) - Body ground BR-R - Body ground Driver side door lock position switch Driver side door UNLOCK → LOCK Below 1 V → 10 to 14 V (or pulse generation)
      LSWP (B7-27) - Body ground Y - Body ground Passenger side door lock position switch input Passenger door UNLOCK → LOCK Below 1 V → 10 to 14 V (or pulse generation)
      LSWL (1P-5) - Body ground L-R - Body ground Rear left door lock position switch input Rear left door UNLOCK → LOCK Below 1 V → 10 to 14 V (or pulse generation)
      LSWR (B7-5) - Body ground L-R - Body ground Rear right door lock position switch input Rear right door UNLOCK → LOCK Below 1 V → 10 to 14 V (or pulse generation)
      HINT:
      • *1 : w/o Power Back Door
      • Use an oscilloscope to check the output voltages of terminals LSWD, LSWP, LSWL and LSWR.
      • If the result is not as specified, the J/B (body ECU) may have a malfunction.
  2. CHECK POWER BACK DOOR ECU (w/ Power back door system) 
    1. Disconnect the P13 and P14 ECU connectors.
      Fig 2: Identifying P13 And P14 ECU Connectors Terminals
      G05140883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard 

      TERMINALS VOLTAGE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ECUB (P13-10) - Body ground W-L - Body ground ECU (ECUB) power supply Always 10 to 14 V
      B (P14-2) - Body ground B-R - Body ground +B (ECUB) power supply Always 10 to 14 V
      GND (P14-8) - Body ground W-B - Body ground Ground Always Below 1 Ω
      IG (P13-9) - Body ground B-R - Body ground Ignition switch input Ignition switch OFF → ON Below 1 V → 10 to 14 V
      HSW (P13-3) - Body ground G-B - Body ground Back door opener switch (outside handle switch) input Back door opener switch OFF → ON 10 kΩ or higher → Below 1 Ω

      HINT:

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

    3. Reconnect the ECU connectors and measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TERMINALS VOLTAGE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CTYO (P14-4) - Body ground G-W - Body ground Back door courtesy switch output Back door CLOSED Ω OPEN 10 to 14 V Ω Below 1 V
      FUL (P13-8) - Body ground B-W - Body ground Back door lock full-latch switch input Back door CLOSED Ω OPEN 10 to 14 V Ω Below 1 V

      HINT:

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

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