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Terminals Of Ecu [11/2023 - ]

  1. CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    GTY1250047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

    2. Reconnect the power distribution box assembly connectors.
    3. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      MB-13 (GND1) - Body ground Ground Always Below 1 Ω
      MB-14 (GND2) - Body ground Ground Always Below 1 Ω
      MB-26 (BECU) - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      MB-27 (IGR) - Body ground IG power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
    4. Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.

      Refer to INSTALLATION [11/2023 - ]

    5. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      8E-7 (BZR) - Body ground Wireless door lock buzzer output Active Test Wireless Buzzer is OFF Below 1 V
      Active Test Wireless Buzzer is ON Pulse generation
      (frequency: 2 kHz, high voltage: 11 to 14 V, low voltage: below 1 V)
  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY1178466Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H138 certification ECU (smart key ECU assembly) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H138-6 (+B) - H138-29 (E) Auxiliary battery power supply Ignition switch off 11 to 14 V
      H138-29 (E) - Body ground Ground Always Below 1 Ω
    3. Reconnect the H138 certification ECU (smart key ECU assembly) connector.
    4. Check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      M106-21 (RCO) - H138-29 (E) Output to electrical key and tire pressure monitoring system receiver assembly
      (Power supply for electrical key and tire pressure monitoring system receiver assembly. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)      		 Procedure: 
      1. Turn ignition switch off
      2. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
      3. Press lock or unlock switch of electrical key transmitter sub-assembly
      		 Plus generation (See waveform 1)
      M106-11 (RDAM) - H138-29 (E) Electrical key and tire pressure monitoring system receiver assembly communication circuit Procedure: 
      1. Turn ignition switch off
      2. Lock all doors
      3. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
      4. Press lock or unlock switch of electrical key transmitter sub-assembly
      		 Plus generation (See waveform 2)
      M106-12 (CSEL) - H138-29 (E) Communication channel switching circuit Procedure: 
      1. Turn ignition switch off
      2. Close all doors
      		 No pulse generation → Pulse generation
    5. Using an oscilloscope, check waveform 1.

      HINT: 

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

      GTY751928Courtesy 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
      WAVEFORM 1 (REFERENCE)

      Item Content
      Tester connection M106-21 (RCO) - H138-29 (E)
      Tool setting 2 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Turn ignition switch off
      2. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. Press lock or unlock switch of electrical key transmitter sub-assembly
    6. Using an oscilloscope, check waveform 2.

      HINT: 

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

      GTY746864Courtesy 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
      WAVEFORM 2 (REFERENCE)

      Item Content
      Tester connection M106-11 (RDAM) - H138-29 (E)
      Tool setting 5 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Turn ignition switch off
      2. Lock all doors
      3. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
      4. Press lock or unlock switch of electrical key transmitter sub-assembly
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