LIN COMMUNICATION SYSTEM TERMINALS OF ECU


  1. CHECK MAIN BODY ECU


    1. Disconnect the 4K and 4A junction block connectors.

    2. Disconnect the G50 main body ECU connector.

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    3. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4K-1 (BECU) - Body ground R - Body ground Battery power supply Always 11 to 14 V
      4A-26 (ACC) - Body ground GR - Body ground ACC power supply Always 11 to 14 V
      G50-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    4. Reconnect the 4K and 4A junction block connectors.

    5. Reconnect the G50 main body ECU connector.

    6. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G50-10 (LIN2) - G50-1 (GND) LG - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the main body ECU may be malfunctioning.

  2. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for DRIVER SIDE)


    1. Disconnect the J4*1 or I4*2 power window regulator motor assembly (for driver side) connector.


      • *1: for LHD

      • *2: for RHD

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J4-2 (B) - J4-1 (GND) B - W-B Battery power supply Always 11 to 14 V
      J4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I4-2 (B) - I4-1 (GND) B - W-B Battery power supply Always 11 to 14 V
      I4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the J4*1 or I4*2 power window regulator motor assembly (for driver side) connector.


      • *1: for LHD

      • *2: for RHD

    4. Check for pulses according to the value(s) in the table below.

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J4-9 (LIN) - J4-1 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I4-9 (LIN) - I4-1 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the power window regulator motor assembly (for driver side) may be malfunctioning.

  3. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for FRONT PASSENGER SIDE)


    1. Disconnect the I4*1 or J4*2 power window regulator motor assembly (for front passenger side) connector.


      • *1: for LHD

      • *2: for RHD

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I4-2 (B) - I4-1 (GND) B - W-B Battery power supply Always 11 to 14 V
      I4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J4-2 (B) - J4-1 (GND) B - W-B Battery power supply Always 11 to 14 V
      J4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the I4*1 or J4*2 power window regulator motor assembly (for front passenger side) connector.


      • *1: for LHD

      • *2: for RHD

    4. Check for pulses according to the value(s) in the table below.

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I4-9 (LIN) - I4-1 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J4-9 (LIN) - J4-1 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the power window regulator motor assembly (for front passenger side) may be malfunctioning.

  4. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR RH SIDE)


    1. Disconnect the K2 power window regulator motor assembly (for rear RH side) connector.

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K2-2 (B) - K2-1 (GND) L - W-B Battery power supply Always 11 to 14 V
      K2-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the K2 power window regulator motor assembly (for rear RH side) connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K2-9 (LIN) - K2-1 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the power window regulator motor assembly (for rear RH side) may be malfunctioning.

  5. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for REAR LH SIDE)


    1. Disconnect the L2 power window regulator motor assembly (for rear LH side) connector.

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L2-2 (B) - L2-1 (GND) L - W-B Battery power supply Always 11 to 14 V
      L2-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the L2 power window regulator motor assembly (for rear LH side) connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L2-9 (LIN) - L2-1 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the power window regulator motor assembly (for rear LH side) may be malfunctioning.

  6. CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. Disconnect the J10*1 or I3*2 multiplex network master switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J10-11 (B) - J10-12 (GND) B - W-B Battery power supply Always 11 to 14 V
      J10-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I3-11 (B) - I3-12 (GND) B - W-B Battery power supply Always 11 to 14 V
      I3-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the J10*1 or I3*2 multiplex network master switch assembly connector.


      • *1: for LHD

      • *2: for RHD

    4. Check for pulses according to the value(s) in the table below.

      for LHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J10-17 (LIN1) - J10-12 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation
      for RHD
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      I3-17 (LIN1) - I3-12 (GND) R - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the multiplex network master switch assembly may be malfunctioning.

  7. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)


    1. Disconnect the M2 sliding roof ECU (sliding roof drive gear assembly) connector.

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      M2-10 (B) - M2-8 (E) SB - W-B Battery power supply Always 11 to 14 V
      M2-8 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the M2 sliding roof ECU (sliding roof drive gear assembly) connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      M2-3 (L1) - M2-8 (E) LG - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the sliding roof ECU (sliding roof drive gear assembly) may be malfunctioning.

  8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the G20 certification ECU (smart key ECU assembly) connector.

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G20-1 (+B) - G20-17 (E) R - W-B Battery power supply Always 11 to 14 V
      G20-17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the G20 certification ECU (smart key ECU assembly) connector.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G20-18 (IG) - G20-17 (E) R - W-B Engine switch power supply Engine switch on (IG) 11 to 14 V
      G20-18 (IG) - G20-17 (E) R - W-B Engine switch power supply Engine switch off Below 1 V
      G20-10 (LIN) - G20-17 (E) GR - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.

  9. CHECK ID CODE BOX (IMMOBILISER CODE ECU)


    1. Disconnect the G15 ID code box (immobiliser code ECU) connector.

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G15-1 (+B) - G15-8 (GND) R - W-B Battery power supply Always 11 to 14 V
      G15-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the G15 ID code box (immobiliser code ECU) connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G15-3 (LIN1) - G15-8 (GND) GR - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the ID code box (immobiliser code ECU) may be malfunctioning.

  10. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


    1. Disconnect the G22 steering lock ECU (steering lock actuator assembly) connector.

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    2. Measure the voltage and resistance according to the value(s) in the table below.

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G22-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G22-6 (IG2) - G22-1 (GND) B - W-B Engine switch power supply Engine switch on (IG) 11 to 14 V
      G22-6 (IG2) - G22-1 (GND) B - W-B Engine switch power supply Engine switch off Below 1 V
      G22-7 (B) - G22-1 (GND) B - W-B Battery power supply Always 11 to 14 V

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

    3. Reconnect the G22 steering lock ECU (steering lock actuator assembly) connector.

    4. Check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G22-5 (LIN) - G22-1 (GND) GR - W-B LIN communication line Engine switch on (IG) Pulse generation

      If the result is not as specified, the steering lock ECU (steering lock actuator assembly) may be malfunctioning.