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Terminals Of Ecu

  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY ECU) 
    Fig 1: Identifying Terminals Of ECU
    G05265648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the IB, IE, IH, IK, IL, B3 and B5 J/B connectors, and check the voltage or continuity of each terminal of the vehicle side connectors.
      ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Condition Specified Condition
      BDR1 (IE-9) - Body Ground G-W - Body ground Always 10 to 14 V
      BECU (IB-4) - Body Ground W-R - Body ground Always 10 to 14 V
      BECU (IL-4) - Body Ground W-R - Body ground Always 10 to 14 V
      GND1 or GND2 (IH-2) - Body Ground W-B - Body ground Always Below 1 Ω
      KSW (B5-14) - Body Ground G-Y - Body ground No key inserted in ignition key cylinder → Key inserted 10 kΩ or higher → Below Ω
      L1 (IK-5) - Body Ground L-W - Body ground Door control switch (Passenger side) OFF → LOCK 10 kΩ or higher → Below 1 →
      UL1 (IK-1) - Body Ground L-O - Body ground Door control switch (Passenger side) OFF → UNLOCK 10 kΩ or higher → Below 1 Ω
      L2 (IK-3) - Body Ground B-O - Body ground Driver side door key cylinder OFF → LOCK 10 kΩ or higher → Below 1 Ω
      UL2 (B3-22) - Body Ground G - Body ground Driver side door key cylinder OFF → UNLOCK 10 kΩ or higher → Below 1 Ω

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

    2. Reconnect the connectors and check the voltage of each terminal of the connectors.
      ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Condition Specified Condition
      DCTY (B4-23) - Body Ground R-Y - Body ground Driver door CLOSED → OPEN 10 to 14 V → Below 1 V
      PCTY (B4-24) - Body Ground R-Y - Body ground Passenger side door CLOSED → OPEN 10 to 14 V → Below 1 V
      RLCY (B4-11) - Body Ground P-B - Body ground Rear left door CLOSED → OPEN 10 to 14 V → Below 1 V
      RRCY (B4-12) - Body Ground P-L - Body ground Rear right door CLOSED → OPEN 10 to 14 V → Below 1 V
      BCTY (B4-7) - Body Ground R-L - Body ground Back door CLOSED → OPEN 10 to 14 V → Below 1 V
      ACT+ (IL-9) - Body Ground L-R - Body ground Door control switch (master switch or passenger side switch) or driver door key cylinder OFF → LOCK Below 1 V → 10 to 14 V → Below 1 V
      ACT+ (IL-6) - Body Ground L-Y - Body ground
      ACT+ (IL-11) - Body Ground L-R - Body ground
      ACT+ (IL-10) - Body Ground L-R - Body ground
      ACT+ (IL-12) - Body Ground L-R - Body ground
      ACT- (IL-18) - Body Ground L-B - Body ground Door control switch (master switch or passenger side switch) or driver door key cylinder OFF → LOCK Below 1 V → 10 to 14 V → Below 1 V
      ACT- (IL-23) - Body Ground L-B - Body ground
      ACT- (IL-22) - Body Ground L-B - Body ground
      ACT- (IL-24) - Body Ground L-B - Body ground
      ACTD (B3-10) - Body Ground L-0 - Body ground Driver side door UNLOCK → LOCK Below 1 V → 10 to 14 V
      LSWP (B3-30) - Body Ground L-R - Body ground Passenger side door UNLOCK → LOCK Below 1 V → 10 to 14 V
      LSR (IL-16) - Body Ground W - Body ground Rear left door UNLOCK → LOCK Below 1 V → 10 to 14 V
      LSR (IK-15) - Body Ground W - Body ground Rear right door UNLOCK → LOCK Below 1 V → 10 to 14 V
      LSR (IK-16) - Body Ground W - Body ground Back door UNLOCK → LOCK Below 1 V → 10 to 14 V

      If the result is not as specified, the vehicle may be defective. In this case, check the harness, connector and fuse between the ECU and battery. Then repair or replace it if necessary.

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