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Terminals Of Ecu [12/2017 - 10/2023]

  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY794634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G71 certification ECU (smart key ECU assembly) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Input/Output Terminal Description Condition Specified Condition Related Data List Item
      G71-18 (E) - Body ground W-B - Body ground - Ground Always Below 1 Ω -
      G71-4 (+B) - G71-18 (E) W - W-B Input Power supply Always 11 to 14 V -
      G71-15 (CUTB) - G71-18 (E) P - W-B Input Dark current cut pin* Always 11 to 14 V -
      1. *: In order to prevent the vehicle battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is installed in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of radio waves every 0.25 seconds, which form the detection area, stops).
    3. Reconnect the G71 certification ECU (smart key ECU assembly) connector.
    4. Measure the voltage and check for pulses according to the value(s) in the table below.
      Tester Connection Wiring Color Input/Output Terminal Description Condition Specified Condition Related Data List Item
      G71-17 (IG1D) - G71-18 (E) B - W-B Output IG power supply Engine switch off → on (IG) Below 1 V → 10 V or higher Power Source Control 
      1. IG Relay Monitor (Outside)
      G71-16 (ACCD) - G71-18 (E) SB - W-B Output ACC power supply Engine switch off → on (ACC) Below 1 V → 10 V or higher Power Source Control 
      1. ACC Relay Monitor
      L31-17 (CLG1) - G71-18 (E) V - W-B Output Output to driver door electrical key antenna
      (request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)      		 Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 1)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 2)
      L31-17 (CLG1) - G71-18 (E) V - W-B Input Input to driver door lock sensor
      (front door outside handle assembly (for Driver Door) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      5. Driver door lock sensor touched
      		 Pulse generation
      (See waveform 3)      		 Smart Access 
      1. D-Door Trigger Switch
      L31-17 (CLG1) - G71-18 (E) V - W-B Input Input to driver door unlock sensor
      (when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Driver door unlock sensor touched
      		 Pulse generation
      (See waveform 4)      		 Smart Access 
      1. D-Door Touch Sensor
      L31-16 (CG1B) - G71-18 (E) B - W-B Output Output to driver door electrical key antenna (terminal on opposite side of component from CLG1 output terminal) Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 5)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 6)
      L31-15 (CLG2) - G71-18 (E) GR - W-B Output Output to front passenger door electrical key antenna
      (request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)      		 Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 1)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 2)
      L31-15 (CLG2) - G71-18 (E) GR - W-B Input Input to front passenger door lock sensor
      (front door outside handle assembly (for Front Passenger Door) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      5. Front passenger door lock sensor touched
      		 Pulse generation
      (See waveform 3)      		 Smart Access 
      1. P-Door Touch Sensor
      L31-15 (CLG2) - G71-18 (E) GR - W-B Input Input to front passenger door unlock sensor
      (when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Front passenger door unlock sensor touched
      		 Pulse generation
      (See waveform 4)      		 Smart Access 
      1. P-Door Touch Sensor
      L31-14 (CG2B) - G71-18 (E) R - W-B Output Output to front passenger door electrical key antenna (terminal on opposite side of component from CLG2 output terminal) Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 5)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 6)
      L31-1 (CLG3) - G71-18 (E) Output W - W-B Output to rear door electrical key antenna (for Driver Side)
      (request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)      		 Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 1)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 2)
      L31-1 (CLG3) - G71-18 (E) Input W - W-B Input to rear door lock sensor (for Driver Side)
      (rear door outside handle assembly (for Driver Side) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      5. Rear door (for Driver Side) lock sensor touched
      		 Pulse generation
      (See waveform 3)      		 Smart Access 
      1. Dr-Door Touch Sensor
      L31-1 (CLG3) - G71-18 (E) Input W - W-B Input to rear door unlock sensor (for Driver Side)
      (when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Rear door (for Driver Side) unlock sensor touched
      		 Pulse generation
      (See waveform 4)      		 Smart Access 
      1. Dr-Door Touch Sensor
      L31-2 (CG3B) - G71-18 (E) Output R - W-B Output to rear door (for Driver Side) electrical key antenna (terminal on opposite side of component from CLG3 output terminal) Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 5)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 6)
      L31-9 (CLG4) - G71-18 (E) Output W - W-B Output to rear door electrical key antenna (for Front Passenger Side)
      (request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)      		 Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 1)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 2)
      L31-9 (CLG4) - G71-18 (E) Input W - W-B Input to rear door lock sensor (for Front Passenger Side)
      (rear door outside handle assembly (for Front Passenger Side) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      5. Rear door (for Front Passenger Side) lock sensor touched
      		 Pulse generation
      (See waveform 3)      		 Smart Access 
      1. Pr-Door Trigger Switch
      L31-9 (CLG4) - G71-18 (E) Input W - W-B Input to rear door unlock sensor (for Front Passenger Side)
      (when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Rear door (for Front Passenger Side) unlock sensor touched
      		 Pulse generation
      (See waveform 4)      		 Smart Access 
      1. Pr-Door Touch Sensor
      L31-8 (CG4B) - G71-18 (E) Output R - W-B Output to rear door (for Front Passenger Side) electrical key antenna (terminal on opposite side of component from CLG4 output terminal) Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*1)

      		 Pulse generation
      (See waveform 5)      		 -
      Procedure:
      1. Engine switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*1)

      		 Pulse generation
      (See waveform 6)
      L31-11 (CLG7) - G71-18 (E) P - W-B Output Output to No. 3 indoor electrical key antenna assembly (inside luggage compartment) Procedure:
      1. Door is closed
      2. Engine switch off
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. Driver door lock sensor touched
      		 Pulse generation
      (See waveform 7)      		 -
      L31-10 (CG7B) - G71-18 (E) W - W-B Output Output to No. 3 indoor electrical key antenna assembly (inside luggage compartment) (terminal on opposite side of component from CLG7 output terminal) Procedure:
      1. Door is closed
      2. Engine switch off
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. Driver door lock sensor touched
      		 Pulse generation
      (See waveform 7)      		 -
      L31-13 (CLG8) - G71-18 (E) LG - W-B Output Output to electrical key antenna (outside luggage compartment) Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. Luggage electrical key switch off → on
      		 Pulse generation
      (See waveform 8)      		 -
      L31-12 (CG8B) - G71-18 (E) B - W-B Output Output to electrical key antenna (outside luggage compartment) (terminal on opposite side of component from CLG8 output terminal) Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. Luggage electrical key switch off → on
      		 Pulse generation
      (See waveform 8)      		 -
      L31-26 (TSW5) - G71-18 (E) G - W-B Input Luggage electrical key switch signal input Luggage electrical key switch off → on Pulse generation
      (See waveform 9)      		 Smart Access 
      1. Tr/B-Door Unlock SW
      L31-18 (RCO) - G71-18 (E) G - W-B Output Output to door control receiver
      (Power supply for door control receiver. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)      		 Procedure:
      1. Engine switch off
      2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
      3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
      		 Pulse generation
      (See waveform 10)      		 -
      L31-19 (RDAM) - G71-18 (E) BE - W-B Input Door control receiver verifies data received from electrical key transmitter sub-assembly.
      Door control receiver sends data from electrical key transmitter sub-assembly to certification ECU (smart key ECU assembly) (Door control receiver intermittently grounds 12 V signal from certification ECU (smart key ECU assembly)).      		 Proceed:
      1. Engine switch off
      2. All doors locked
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
      5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
      		 Pulse generation
      (See waveform 11)      		 -
      L31-20 (CSEL) - G71-18 (E) P - W-B Output Communication channel switching circuit Procedure:
      1. Engine switch off
      2. All doors closed
      		 Below 1 V → Pulse generation -
      L31-21 (ASEL) - G71-18 (E) B - W-B Output Communication channel switching circuit Procedure:
      1. Engine switch off
      2. All doors locked
      3. Electrical key transmitter sub-assembly held and then luggage electrical key switch off → on
      		 Below 1 V → 4.5 to 6 V -
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2017 - 10/2023] 

    5. Using an oscilloscope, check waveform of the ECU.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      1. Waveform 1
        Item Content
        Tester Connection L31-17 (CLG1) - G71-18 (E)
        L31-15 (CLG2) - G71-18 (E)
        L31-1 (CLG3) - G71-18 (E)
        L31-9 (CLG4) - G71-18 (E)
        Tool Setting 5 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. All doors closed
        3. Electrical key transmitter sub-assembly not inside vehicle
        4. All doors locked through wireless operation

          (electrical key transmitter sub-assembly brought inside detection area*)
        Fig 1: Waveform 1
        GTY448796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. *: For details about the entry function detection area, refer to Operation Check.

          Refer to OPERATION CHECK [12/2017 - 10/2023] 

      2. Waveform 2
        Item Content
        Tester Connection L31-17 (CLG1) - G71-18 (E)
        L31-15 (CLG2) - G71-18 (E)
        L31-1 (CLG3) - G71-18 (E)
        L31-9 (CLG4) - G71-18 (E)
        Tool Setting 5 V/DIV., 100 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. All doors closed
        3. Electrical key transmitter sub-assembly not inside vehicle
        4. All doors locked through wireless operation

          (electrical key transmitter sub-assembly brought outside detection area*)
        Fig 2: Waveform 2
        GTY427636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. *: For details about the entry function detection area, refer to Operation Check.

          Refer to OPERATION CHECK [12/2017 - 10/2023] 

      3. Waveform 3
        Item Content
        Tester Connection L31-17 (CLG1) - G71-18 (E)
        L31-15 (CLG2) - G71-18 (E)
        L31-1 (CLG3) - G71-18 (E)
        L31-9 (CLG4) - G71-18 (E)
        Tool Setting 5 V/DIV., 40 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. Electrical key transmitter sub-assembly brought outside vehicle
        3. All doors closed
        4. All doors locked through wireless operation

          (electrical key transmitter sub-assembly brought outside detection area*)

        5. Lock sensor not touched → touched
        Fig 3: Waveform 3
        GTY430392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Lock sensor not touched
        *b Lock sensor touched
        1. *: For details about the entry function detection area, refer to Operation Check.

          Refer to OPERATION CHECK [12/2017 - 10/2023] 

      4. Waveform 4
        Item Content
        Tester Connection L31-17 (CLG1) - G71-18 (E)
        L31-15 (CLG2) - G71-18 (E)
        L31-1 (CLG3) - G71-18 (E)
        L31-9 (CLG4) - G71-18 (E)
        Tool Setting 5 V/DIV., 50 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. Electrical key transmitter sub-assembly brought outside vehicle
        3. All doors locked
        4. Electrical key transmitter sub-assembly not near the vehicle
        5. Unlock sensor not touched → touched
        Fig 4: Waveform 4
        GTY438196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Unlock sensor not touched
        *b Unlock sensor touched
      5. Waveform 5
        Item Content
        Tester Connection L31-16 (CG1B) - G71-18 (E)
        L31-14 (CG2B) - G71-18 (E)
        L31-2 (CG3B) - G71-18 (E)
        L31-8 (CG4B) - G71-18 (E)
        Tool Setting 5 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. All doors closed
        3. Electrical key transmitter sub-assembly not inside vehicle
        4. All doors locked through wireless operation

          (electrical key transmitter sub-assembly brought inside detection area*)
        Fig 5: Waveform 5
        GTY504760Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. *: For details about the entry function detection area, refer to Operation Check.

          Refer to OPERATION CHECK [12/2017 - 10/2023] 

      6. Waveform 6
        Item Content
        Tester Connection L31-16 (CG1B) - G71-18 (E)
        L31-14 (CG2B) - G71-18 (E)
        L31-2 (CG3B) - G71-18 (E)
        L31-8 (CG4B) - G71-18 (E)
        Tool Setting 5 V/DIV., 100 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. All doors closed
        3. Electrical key transmitter sub-assembly not inside vehicle
        4. All doors locked through wireless operation

          (electrical key transmitter sub-assembly brought outside detection area*)
        Fig 6: Waveform 6
        GTY499393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. *: For details about the entry function detection area, refer to Operation Check.

          Refer to OPERATION CHECK [12/2017 - 10/2023] 

      7. Waveform 7
        Item Content
        Tester Connection L31-11 (CLG7) - G71-18 (E)
        L31-10 (CG7B) - G71-18 (E)
        Tool Setting 2 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Door is closed
        2. Engine switch off
        3. Electrical key transmitter sub-assembly not inside vehicle
        4. Driver door lock sensor touched
        Fig 7: Waveform 7
        GTY746166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Driver door lock sensor not touched
        *b Driver door lock sensor touched
      8. Waveform 8
        Item Content
        Tester Connection L31-13 (CLG8) - G71-18 (E)
        L31-12 (CG8B) - G71-18 (E)
        Tool Setting 2 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. Electrical key transmitter sub-assembly brought outside vehicle
        3. All doors closed
        4. Luggage electrical key switch off → on
        Fig 8: Waveform 8
        GTY432845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      9. Waveform 9
        Item Content
        Tester Connection L31-26 (TSW5) - G71-18 (E)
        Tool Setting 2 V/DIV., 500 ms/DIV.
        Condition Luggage electrical key switch off → on
        Fig 9: Waveform 9
        GTY379040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Checking for switch on signal at short intervals
      10. Waveform 10
        Item Content
        Tester Connection L31-18 (RCO) - G71-18 (E)
        Tool Setting 2 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
        3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
        Fig 10: Waveform 10
        GTY376258Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Before lock or unlock switch of electrical key transmitter sub-assembly pressed
        *b After lock or unlock switch of electrical key transmitter sub-assembly pressed
      11. Waveform 11
        Item Content
        Tester Connection L31-19 (RDAM) - G71-18 (E)
        Tool Setting 5 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Engine switch off
        2. All doors locked
        3. Electrical key transmitter sub-assembly not inside vehicle
        4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
        5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
        Fig 11: Waveform 11
        GTY367752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Before lock or unlock switch of electrical key transmitter sub-assembly pressed
        *b After lock or unlock switch of electrical key transmitter sub-assembly pressed
  2. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    Fig 12: Instrument Panel Junction Block Assembly And Main Body ECU (Multiplex Network Body ECU) Connector End View
    GTY810326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [12/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020] , or refer to REMOVAL [10/2020 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023]

    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Input/Output Terminal Description Condition Specified Condition
      A-11 (GND1) - Body ground - - Ground Always Below 1 Ω
      A-31 (BECU) - Body ground - Input Battery power supply (for CPU) Always 11 to 14 V
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