LIN COMMUNICATION SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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    Text in Illustration
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

    		 *b

    Component without harness connected

    (Main Body ECU (Multiplex Network Body ECU))

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly Click here.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Switch Condition Specified Condition
      MB-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω
      MB-29 (ACC) - Body ground None - Body ground Auxiliary battery power supply Ignition switch ACC 11 to 14 V
      MB-30 (BECU) - Body ground None - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      MB-32 (IG) - Body ground None - Body ground Auxiliary battery power supply Ignition switch ON (IG) 11 to 14 V

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

    3. Reinstall the main body ECU (multiplex network body ECU) onto the instrument panel junction block assembly.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Switch Condition Specified Condition
      3B-12(LIN2)*1 - 3B-8 (GND1) W - W-B LIN Communication line Ignition switch ON (IG) Pulse generation
      3B-26 (LIN2)*2 - 3B-8 (GND1) R - W-B LIN Communication line Ignition switch ON (IG) Pulse generation

      • *1: w/ Power Window

      • *2: w/ Double Locking System

      If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may have a malfunction.

  2. CHECK FRONT DOOR WINDOW REGULATOR ASSEMBLY LH (POWER WINDOW REGULATOR MOTOR ASSEMBLY LH) (DRIVER SIDE) (w/ Power Window, for LHD)

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    1. Disconnect the H3 front door window regulator assembly LH (power window regulator motor assembly LH) (driver side) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      H3-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      H3-2 (B) - Body ground G - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V

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

    3. Reconnect the H3 front door window regulator assembly LH (power window regulator motor assembly LH) (driver 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
      H3-9 (LIN) - H3-1 (GND) B - W-B LIN communication line Ignition switch ON (IG) Pulse generation

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

  3. CHECK FRONT DOOR WINDOW REGULATOR ASSEMBLY RH (POWER WINDOW REGULATOR MOTOR ASSEMBLY RH) (DRIVER SIDE) (w/ Power Window, for RHD)

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    1. Disconnect the G3 front door window regulator assembly RH (power window regulator motor assembly RH) (driver side) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G3-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G3-2 (B) - Body ground G - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V

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

    3. Reconnect the G3 front door window regulator assembly RH (power window regulator motor assembly RH) (driver 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
      G3-9 (LIN) - G3-1 (GND) B - W-B LIN communication line Ignition switch ON (IG) Pulse generation

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

  4. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Power Switch)

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    1. Disconnect the F47 and F48 certification ECU (smart key ECU assembly) connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Switch Condition Specified Condition
      F47-5 (+B) - Body ground BE - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      F48-1 (E) - Body ground BR - 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 F47 and F48 certification ECU (smart key ECU assembly) connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F47-16 (IG) - F48-1 (E) P - BR IG power supply Ignition switch ON (IG) 11 to 14 V
      F47-16 (IG) - F48-1 (E) P - BR IG power supply Ignition switch off Below 1 V
      F47-12 (LIN) - F48-1 (E) BE - BR LIN communication line Ignition switch ON (IG) Pulse generation

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

  5. CHECK POWER MANAGEMENT CONTROL ECU (w/ Power Switch)

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    1. Disconnect the F55 and F56 power management control ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Switch Condition Specified Condition
      F55-1 (AM22) - Body ground B - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      F56-7 (AM21) - Body ground B - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      F55-6 (E1) - Body ground BR - 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 F55 and F56 power management control ECU connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F56-11 (LIN2) - F55-6 (E1) BE - BR LIN communication line Ignition switch ON (IG) Pulse generation

      If the result is not as specified, the power management control ECU may be malfunctioning.

  6. CHECK STEERING LOCK ACTUATOR ASSEMBLY (w/ Power Switch)

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    1. Disconnect the F44 steering lock actuator assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Switch Condition Specified Condition
      F44-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F44-6 (IG2) - Body ground SB - Body ground Auxiliary battery power supply Ignition switch ON (IG) 11 to 14 V
      F44-7 (B) - Body ground GR - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V

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

    3. Reconnect the F44 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
      F44-5 (LIN) - F44-1 (GND) BE - W-B LIN communication line Ignition switch ON (IG) Pulse generation

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

  7. CHECK ID CODE BOX (IMMOBILISER CODE ECU) (w/ Power Switch)

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    1. Disconnect the F43 ID code box (immobiliser code ECU) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F43-1 (+B) - Body ground BE - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      F43-5 (GND) - Body ground BR - 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 F43 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
      F43-2 (LIN1) - F43-5 (GND) B - BR LIN communication line Ignition switch ON (IG) Pulse generation

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

  8. CHECK DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY (w/ Double Locking Function)

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    1. Disconnect the F58 double lock door control relay assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F58-1 (+B) - Body ground L - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      F58-7 (CPUB) - Body ground BE - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      F58-14 (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 F58 double lock door control relay 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
      F58-9 (MPX1) - F58-14 (GND) R - W-B LIN communication line Ignition switch ON (IG) Pulse generation

      If the result is not as specified, the double lock door control relay assembly may be malfunctioning.