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Terminals Of Ecu

  1. CHECK DOOR CONTROL RELAY ASSEMBLY 
    Fig 1: Identifying ECU Connector Terminals
    G04229235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D4 relay connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (D4-1) - Body ground L-W - Body ground +B (B) power supply Always 10 to 14 V
      E (D4-12) - Body ground W-B - Body ground Ground Always Below 1Ω
      IG (D4-26) - Body ground R-B - Body ground Ignition power supply Ignition switch ON 10 to 14 V
      KSW (D4-8) - Body ground Y - Body ground Unlock warning switch input No key in ignition key cylinder 10 kΩ or higher
      Key inserted Below 1 Ω
      DCTY (D4-5) - Body ground R - Body ground Driver side courtesy switch input Driver side door Closed 10 kΩ or higher
      Driver side door Open Below 1 Ω
      PCTY (D4-7) - Body ground R-W - Body ground Courtesy switch input other than driver side door Front passenger side door, rear door (LH, RH) or back door Closed 10 kΩ or higher
      Front passenger side door, rear door (LH, RH) or back door Open Below 1 Ω
      L1 (D4-18) - Body ground BR-Y - Body ground Door control switch (master switch and front passenger side switch) lock input Door control switch (master switch or front passenger side switch) OFF 10 kΩ or higher
      Door control switch (master switch or front passenger side switch) LOCK Below 1 Ω
      UL1 (D4-19) - Body ground G-B - Body ground Door control switch (master switch and front passenger side switch) unlock input Door control switch (master switch or front passenger side switch) OFF 10 kΩ or higher
      Door control switch (master switch or front passenger side switch) UNLOCK Below 1 Ω
      LSWD (D4-6) - Body ground L-R - Body ground Driver side door lock position switch input Driver side door UNLOCK 10 kΩ or higher
      Driver side door LOCK Below 1 Ω
      L2 (D4-20) - Body ground L-W - Body ground Driver and front passenger side door key-linked door lock input Driver side or front passenger side door key cylinder OFF 10 kΩ or higher
      Driver side or front passenger side door key cylinder LOCK Below 1 Ω
      UL3 (D4-21) - Body ground Y-B - Body ground Driver side door key-linked door unlock input Driver side door key cylinder OFF 10 kΩ or higher
      Driver side door key cylinder UNLOCK Below 1 Ω
      UL2 (D4-22) - Body ground L-R - Body ground Front passenger side door key-linked door unlock input Front passenger side door key cylinder OFF 10 kΩ or higher
      Front passenger side door key cylinder UNLOCK Below 1 Ω
      BDSU (D4-17) - Body ground BR-Y - Body ground Back door opener switch input Back door opener switch (outside handle switch) OFF 10 kΩ or higher
      Back door opener switch (outside handle switch) ON Below 1 Ω

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

    3. Reconnect the D4 relay connector.
    4. Measure the voltage of the connector.
      TERMINAL NUMBER SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ACT+ (D4-2) - Body ground L-O - Body ground Door lock motor LOCK drive output (driver, front passenger, rear LH and rear RH doors) Door control switch (master switch or front passenger side switch) or door key cylinder (driver or front passenger)
      1. OFF -->
      2. LOCK -->
      3. OFF
      1. Below 1 V -->
      2. 10 to 14 V -->
      3. Below 1 V
      ACTD (D4-11) - Body ground Y-G - Body ground Door lock motor UNLOCK drive output (driver door) Door control switch (master switch or front passenger side switch) or door key cylinder (driver or front passenger)
      1. OFF -->
      2. UNLOCK -->
      3. OFF
      1. Below 1 V -->
      2. 10 to 14 V -->
      3. Below 1 V
      ACT- (D4-3) - Body ground L-B - Body ground Door lock motor UNLOCK drive output (front passenger, rear LH and rear RH doors)
      BACT (D4-10) - Body ground L-Y - Body ground Back door lock motor OPEN drive output Back door unlocked, back door opener switch (outside handle switch)
      1. OFF -->
      2. ON -->
      3. OFF
      1. Below 1 V -->
      2. 10 to 14 V -->
      3. Below 1 V

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

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