THEFT DETERRENT SYSTEM TERMINALS OF ECU


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

    A005KMOE03
    Text in Illustration
    *1 Instrument Panel Junction Block Assembly *2

    Main Body ECU

    (Multiplex Network Body ECU)

    1. Remove the main body ECU (multiplex network body ECU) Click here.

    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
      MB-30 (BECU) - Body ground None - Body ground Battery power supply Always 11 to 14 V
      MB-31 (ALTB) - Body ground None - Body ground Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground None - Body ground Ignition switch power supply Ignition switch to ON 11 to 14 V
      None - Body ground Ignition switch power supply Ignition switch off Below 1 V
      MB-29 (ACC) - Body ground None - Body ground ACC power supply Ignition switch ACC 11 to 14 V
      None - Body ground ACC power supply Ignition switch off Below 1 V
      MB-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω

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

    3. Install the main body ECU (multiplex network body ECU) Click here.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3D-36 (FLCY) - Body ground L - Body ground Front door LH courtesy switch input Front door LH open Below 1 V
      L - Body ground Front door LH courtesy switch input Ignition switch off, all doors closed and Front door LH closed Pulse generation (See waveform 1 or 2)
      F76-19 (FRCY) - Body ground Y - Body ground Front door RH courtesy switch input Front door RH open Below 1 V
      Y - Body ground Front door RH courtesy switch input Ignition switch off, all doors closed and Front door RH closed Pulse generation (See waveform 1 or 2)
      F76-6 (LRCY) - Body ground G - Body ground Rear door LH courtesy light switch input Rear door LH open Below 1 V
      G - Body ground Rear door LH courtesy light switch input Rear door LH closed Pulse generation (See waveform 1 or 2)
      G - Body ground Rear door RH courtesy light switch input Rear door RH open Below 1 V
      G - Body ground Rear door RH courtesy light switch input Rear door RH closed Pulse generation (See waveform 1 or 2)
      3D-35 (BCTY) - Body ground B - Body ground Back door courtesy light switch input Back door open Below 1 V
      B - Body ground Back door courtesy light switch input Back door closed Pulse generation (See waveform 1 or 2)
      F76-7 (LSFL) - Body ground L - Body ground Front door LH lock position switch input Front door LH unlocked Below 1 V
      L - Body ground Front door LH lock position switch input Ignition switch off, all doors closed and front door LH locked 11 to 14 V
      F76-18 (LSFR) - Body ground LG - Body ground Front door RH lock position switch input Front door RH unlocked Below 1 V
      LG - Body ground Front door RH lock position switch input Ignition switch off, all doors closed and front door RH locked Pulse generation (See waveform 1 or 2)
      3D-24 (LSR) - Body ground Y - Body ground Rear door LH lock position switch input Rear door LH unlocked Below 1 V
      Y - Body ground Rear door LH lock position switch input Ignition switch off, all doors closed and rear door LH locked 11 to 14 V
      3D-25 (LSR) - Body ground V - Body ground Rear door RH lock position switch input Rear door RH unlocked Below 1 V
      V - Body ground Rear door RH lock position switch input Ignition switch off, all doors closed and rear door RH locked 11 to 14 V
      F77-22 (IND) - Body ground SB - Body ground Security indicator light signal Security indicator light illuminates (illuminates only for 9 (+/-0.45) seconds in alarm sounding state (blinks when system in armed state)) 5 V or higher
      F77-5 (HCTY) - Body ground GR - Body ground Security courtesy switch Engine hood open Below 1 V
      GR - Body ground Security courtesy switch Ignition switch off, all doors closed and engine hood closed Pulse generation (See waveform 13 or 14)
      3C-19 (HORN) - Body ground LG - Body ground Vehicle horn signal Vehicle horn sounding (theft warning system in alarm sounding state) Pulse generation
      LG - Body ground Vehicle horn signal Vehicle horn not sounding (theft warning system in armed state) 11 to 14 V
      3C-20 (SH) - Body ground GR - Body ground Security horn signal Security horn sounding (theft warning system in alarm sounding state) Pulse generation
      GR - Body ground Security horn signal Security horn not sounding (theft warning system in armed state) 11 to 14 V

      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.

    5. A005M02E01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) F76-6 (LRCY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and rear door LH closed
      Item Content
      Terminal No. (Symbol) F76-6 (LRCY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and rear door RH closed
      Item Content
      Terminal No. (Symbol) 3D-35 (BCTY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and back door closed
      Item Content
      Terminal No. (Symbol) F76-7 (LSFL) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and front door LH locked
      Item Content
      Terminal No. (Symbol) F76-18 (LSFR) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and front door RH locked
      Item Content
      Terminal No. (Symbol) F77-5 (HCTY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and engine hood closed
    6. A005JC5E01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) F76-6 (LRCY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and rear door LH closed
      Item Content
      Terminal No. (Symbol) F76-6 (LRCY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and rear door RH closed
      Item Content
      Terminal No. (Symbol) 3D-35 (BCTY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and back door closed
      Item Content
      Terminal No. (Symbol) F76-7 (LSFL) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and front door LH locked
      Item Content
      Terminal No. (Symbol) F76-18 (LSFR) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and front door RH locked
      Item Content
      Terminal No. (Symbol) F77-5 (HCTY) - Body ground
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition Ignition switch off, all doors closed and engine hood closed