RX400h · Service Manual SECURITIES

TERMINALS OF ECU

System information


CHECK TRANSPONDER KEY AMPLIFIER

  1. Disconnect the T7 amplifier connector and measure the resistance between the terminal of the wire harness side connector and body ground.
    B065593E07

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    GND (T7-7) - Body ground
    		 W - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

  2. Reconnect the T8 amplifier connector and measure the resistance and voltage of each terminal of the connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    VC5 (T7-1) - GND (T7-7)
    		 P - W
    		 Power source
    		 No key is in ignition key cylinder
    		 Below 1 V
    Key is in ignition key cylinder
    		 4.6 to 5.4 V
    CODE (T7-4) - GND (T7-7)
    		 LG - W
    		 Demodulated signal of key code date
    		 No key is in ignition key cylinder
    		 Below 1 V
    Key is in ignition key cylinder
    		 Waveform 1
    TEXT (T7-5) - GND (T7-7)
    		 BR - W
    		 Key code output signal
    		 No key is in ignition key cylinder
    		 Below 1 V
    Key is in ignition key cylinder
    		 Waveform 2
    GND (T7-7) - Body ground
    		 W - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    If the result is not as specified, the amplifier may have a malfunction.

  3. Inspect using an oscilloscope.

    1. B111835E01
      Waveform 1 (Reference):
      Terminal
      		 CODE - GND
      Tool Setting
      		 2 V/DIV., 20 ms/DIV.
      Condition
      		 Key is in ignition key cylinder

    2. B111836E01
      Waveform 2 (Reference):
      Terminal
      		 TXCT - GND
      Tool Setting
      		 2 V/DIV., 10 ms/DIV.
      Condition
      		 Key is in ignition key cylinder


CHECK TRANSPONDER KEY ECU ASSEMBLY

  1. Disconnect the T8 ECU connector and measure the resistance and voltage between each terminal of the wire harness side connector.
    B111613E06

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    CPUB (T8-1) - GND (T8-14)
    		 V - W-B
    		 Battery
    		 Always
    		 10 to 14 V
    IG2 (T8-2) - GND (T8-14)
    		 V - W
    		 Ignition switch
    		 Ignition switch off
    		 Below 1 V
    Ignition switch on
    		 10 to 14 V
    KSW (T8-3) - GND (T8-14)
    		 B - W
    		 Unlock warning switch
    		 No key is in ignition key cylinder
    		 10 kΩ or higher
    Key is in ignition key cylinder
    		 Below 1 Ω
    MPX1 (T8-4) - Body ground
    		 O - Body ground
    		MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (T8-5) - Body ground
    		 R (LHD) - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    MPX2 (T8-5) - Body ground
    		 Y (RHD) - Body ground
    		 MPX line
    		 Always
    		 10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

  2. Reconnect the T8 ECU connector and measure the voltage of each terminal of the connector.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    AGND (T8-13) - Body ground
    		 W - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    KSW (T8-3) - GND (T8-14)
    		 B - W
    		 Unlock warning switch
    		 No key is in ignition key cylinder
    		 10 to 14 V
    Key is in ignition key cylinder
    		 Below 1 V
    VC5 (T8-9) - AGND (T8-13)
    		 P - W
    		 Power source
    		 Ignition switch off
    		 Below 1 V
    Ignition switch on
    		 4.6 to 5.4 V
    TXCT (T8-12) - AGND (T8-13)
    		 BR - W
    		 Transponder key amplifier communication signal
    		 No key is in ignition key cylinder
    		 Below 1 V
    Key is in ignition key cylinder
    		 Waveform 1
    CODE (T8-10) - AGND (T8-13)
    		 LG - W
    		 Transponder key amplifier ground
    		 No key is in ignition key cylinder
    		 Below 1 V
    Key is in ignition key cylinder
    		 Waveform 2
    EFIO (T8-6) - GND (T8-14)
    		 GR - W
    		 Hybrid vehicle control ECU output signal
    		 Ignition switch off
    		 Below 1 V
    Ignition switch on
    		 Waveform 3
    EFII (T8-7) - GND (T8-14)
    		 L - W
    		 Hybrid vehicle control ECU input signal
    		 Ignition switch off
    		 Below 1 V
    Ignition switch on
    		 Waveform 4
    If the result is not as specified, the ECU may have a malfunction.

  3. Inspect using an oscilloscope.

    1. B111836E01
      Waveform 1 (Reference):
      Terminal
      		 TXCT - AGND
      Tool Setting
      		 2 V/DIV., 10 ms/DIV.
      Condition
      		 Key is in ignition key cylinder

    2. B111835E01
      Waveform 2 (Reference):
      Terminal
      		 CODE - AGND
      Tool Setting
      		 2 V/DIV., 20 ms/DIV.
      Condition
      		 Key is in ignition key cylinder

    3. B111838E01
      Waveform 3 (Reference):
      Terminal
      		 EFIO - GND
      Tool Setting
      		 2 V/DIV., 1 s/DIV.
      Condition
      		 Ignition switch on

    4. B111837E01
      Waveform 4 (Reference):
      Terminal
      		 EFII - GND
      Tool Setting
      		 2 V/DIV., 200 ms/DIV.
      Condition
      		 Ignition switch on


CHECK HYBRID VEHICLE CONTROL ECU

  1. Disconnect the H32 hybrid vehicle control ECU connector and measure the resistance between the terminal of the wire harness side connector and body ground.
    B111585E04

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    E1 (H32-5) - Body ground
    		 BR - Body ground
    		 Ground
    		 Always
    		 Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

  2. Reconnect the H32 hybrid vehicle control ECU. Measure the voltage between each terminal of the connector according to the value(s) in the table below.

    Symbols (Terminal No.)
    		 Wiring Color
    		 Terminal Description
    		 Condition
    		 Specified Condition
    IMI (H29-22) - E1 (H32-5)
    		 GR - BR
    		 Transponder key ECU input signal
    		 Ignition switch off
    		 Below 1 V
    Ignition switch on
    		 Waveform 1
    IMO (H29-28) - E1 (H32-5)
    		 L- BR
    		 Transponder key ECU output signal
    		 Ignition switch off
    		 Below 1 V
    Ignition switch on
    		 Waveform 2
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Inspect using an oscilloscope.

    1. B111838E01
      Waveform 1 (Reference):
      Terminal
      		 IMI - E1
      Tool Setting
      		 2 V/DIV., 1 s/DIV.
      Condition
      		 Ignition switch on

    2. B111837E01
      Waveform 2 (Reference):
      Terminal
      		 IMO - E1
      Tool Setting
      		 2 V/DIV., 200 ms/DIV.
      Condition
      		 Ignition switch on

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