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Terminals Of Ecu

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  1. CHECK INSTRUMENT PANEL J/B ASSEMBLY (MULTIPLEX NETWORK BODY ECU) 
    Fig 1: Instrument Panel J/B Assembly (Multiplex Network Body ECU) Connector Terminals
    G04387360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2D, 2F, 2J, 2K and 2M J/B connectors.
    2. Disconnect the B6, B7, B8 and B9 ECU connectors.
    3. Measure the voltage and resistance of the wire harness side connectors.
      MULTIPLEX NETWORK BODY ECU VOLTAGE AND RESISTANCE SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ALTB (2D-16) - Body ground L-W - Body ground +B (power system, generator system) power supply Always 10 to 14V
      BECU (2F-1) - Body ground W-R - Body ground +B (BECU) power supply Always 10 to 14V
      GND1 (2F-10) - Body ground W-B - Body ground Ground Always Below 1Ω
      GND2 (2M-9) - Body ground W-B(1) - Body ground Ground Always Below 1Ω
      GND2 (2M-9) - Body ground BR(2) - Body ground Ground Always Below 1Ω
      KSW (B6-21) - Body ground L - Body ground Key unlock warning switch input 1: No key in ignition key cylinder --> 2: Key inserted 1: 10 kΩ or higher --> 2: Below 1Ω
      DBKL (B8-9) - Body ground BR-Y(1) - Body ground Driver side seat belt buckle switch input Driver side seat belt  
      1: Not fastened --> 1: 10 kΩ or higher -->
      2: Key inserted 2: Below 1Ω
      DBKL (B8-9) - Body ground G-Y(2) - Body ground Driver side seat belt buckle switch input Driver side seat belt  
      1: Not fastened --> 1: 10 kΩ or higher -->
      2: Key inserted 2: Below 1Ω
      HCTY(3) (B9-10) - Body ground B - Body ground Engine hood courtesy switch input Engine hood  
      1: Closed --> 1: 10 kΩ or higher -->
      2: Open 2: Below 1Ω
      DCTY (B8-14) - Body ground R-G - Body ground Driver side courtesy switch input Driver side door  
      1: Closed --> 1: 10 kΩ or higher -->
      2: Open 2: Below 1Ω
      PCTY (B7-23) - Body ground R-G - Body ground Passenger side courtesy switch input Passenger side door  
      1: Closed --> 1: 10 kΩ or higher -->
      2: Open 2: Below 1Ω
      LGCY (B7-25) - Body ground G-R(1) - Body ground Luggage compartment door courtesy switch input Luggage compartment door  
      1: Closed --> 1: 10 kΩ or higher -->
      2: Open 2: Below 1Ω
      LGCY (B7-25) - Body ground R(2) - Body ground Luggage compartment door courtesy switch input Luggage compartment door  
      1: Closed --> 1: 10 kΩ or higher -->
      2: Open 2: Below 1Ω
      L1 (2K-15) - Body ground
      L1 (2J-3) - Body ground      		 R-Y(1) - Body ground Door control switch (master switch and passenger side switch) lock input Door control switch (master switch or passenger side switch)  
      1: OFF --> 1: 10 kΩ or higher -->
      2: LOCK 2: Below 1Ω
      L1 (2K-15) - Body ground
      L1 (2J-3) - Body ground      		 LG(2) - Body ground Door control switch (master switch and passenger side switch) lock input Door control switch (master switch or passenger side switch)  
      1: OFF --> 1: 10 kΩ or higher -->
      2: LOCK 2: Below 1Ω
      UL1 (2K-12) - Body ground
      UL1 (2J-4) - Body ground      		 G-R - Body ground Door control switch (master switch and passenger side switch) unlock input Door control switch (master switch or passenger side switch)  
      1: OFF --> 1: 10 kΩ or higher -->
      2: UNLOCK 2: Below 1Ω
      LSWD (B8-7) - Body ground BR-R(1) - Body ground Driver side door lock position switch input Driver side door  
      1: Unlocked --> 1: 10 kΩ or higher -->
      2: Locked 2: Below 1Ω
      LSWD (B8-7) - Body ground LG-R(2) - Body ground Driver side door lock position switch input Driver side door  
      1: Unlocked --> 1: 10 kΩ or higher -->
      2: Locked 2: Below 1Ω
      LSWP (B7-27) - Body ground Y - Body ground Passenger side door lock position switch input Passenger side door  
      1: Unlocked --> 1: 10 kΩ or higher -->
      2: Locked 2: Below 1Ω
      L2 (2K-16) - Body ground LG(1) - Body ground Driver side door key-linked door lock input Driver side door key cylinder  
      1: OFF --> 1: 10 kΩ or higher -->
      2: LOCK 2: Below 1Ω
      L2 (2K-16) - Body ground L-Y(2) - Body ground Driver side door key-linked door lock input Driver side door key cylinder  
      1: OFF --> 1: 10 kΩ or higher -->
      2: LOCK 2: Below 1Ω
      UL3 (B8-8) - Body ground L - Body ground Driver side door key-linked door unlock input Driver side door key cylinder  
      1: OFF --> 1: 10 kΩ or higher -->
      2: UNLOCK 2: Below 1Ω
      (1) Coupe
      (2) Convertible
      (3) Coupe, convertible w/VSC

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

    4. Reconnect the 2D, 2F, 2J, 2K and 2M J/B connectors.
    5. Reconnect the B6, B7, B8 and B9 ECU connectors.
    6. Measure the voltage of the connectors.

      Voltage: 

      CONNECTOR TERMINALS VOLTAGE SPECIFIED CONDITIONS

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ACT+ (2K-2) - Body ground
      ACT+ (2F-5)(1) - Body ground      		 L-Y(1) - Body ground Door lock motor LOCK drive output (driver and passenger side doors) Door control switch (master switch or passenger side switch) or driver side door key cylinder  
      1: OFF --> 1: Below 1V -->
      2: LOCK --> 2: 10 to 14V -->
      3: OFF 3: Below 1V
      ACT+ (2K-2) - Body ground
      ACT+ (2J-1)(2) - Body ground      		 L-R(2) - Body ground Door lock motor LOCK drive output (driver and passenger side doors) Door control switch (master switch or passenger side switch) or driver side door key cylinder  
      1: OFF --> 1: Below 1V -->
      2: LOCK --> 2: 10 to 14V -->
      3: OFF 3: Below 1V
      ACTD (B8-4) - Body ground L-B - Body ground Door lock motor UNLOCK drive output (driver side door) Door control switch (master switch or passenger side switch) or driver side door key cylinder  
      1: OFF --> 1: Below 1V -->
      2: LOCK --> 2: 10 to 14V -->
      3: OFF 3: Below 1V
      ACT- (2J-2) - Body ground L-B - Body ground Door lock motor UNLOCK drive output (passenger side door) Door control switch (master switch or passenger side switch) or driver side door key cylinder  
      1: OFF --> 1: Below 1V -->
      2: LOCK --> 2: 10 to 14V -->
      3: OFF 3: Below 1V
      TR+ (B6-1) - Body ground W-L - Body ground Luggage compartment door lock motor OPEN drive output Transmitter switch (luggage compartment door)  
      1: OFF --> 1: Below 1V -->
      2: ON --> 2: 10 to 14V -->
      3: OFF 3: Below 1V
      (1) Coupe
      (2) Convertible

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

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