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Terminals Of Ecu [12/2012 - 10/2015]

  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    Fig 1: Instrument Panel Junction Block Assembly, Main Body ECU (Multiplex Network Body ECU) Connector End View (1 Of 2)
    GTY366856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Instrument Panel Junction Block Assembly, Main Body ECU (Multiplex Network Body ECU) Connector End View (2 Of 2)
    GTY372774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *A Main Body ECU (Multiplex Network Body ECU) with 1 connector *B Main Body ECU (Multiplex Network Body ECU) with 3 connectors
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [12/2012 - ]

    2. Connect the instrument panel junction block assembly connectors.
    3. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-32 (IG) - Body ground - Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      A-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction in the wire harness or instrument panel junction block assembly.

    4. Install the main body ECU (multiplex network body ECU).

      Refer to INSTALLATION [12/2012 - 08/2016]

    5. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G78-5 (HU) - Body ground Y - Body ground Headlight dimmer switch high signal input Headlight dimmer switch in high position Below 1 V
      Headlight dimmer switch in low position Pulse generation*3
      11 to 14 V*4
      G78-6 (RCTY) - Body ground Y - Body ground Rear door courtesy light switch RH signal Rear door RH open Below 1 V
      Rear door RH close Pulse generation
      G78-8 (HF) - Body ground R - Body ground Headlight dimmer switch high flash signal input Headlight dimmer switch in high flash position Below 1 V
      Headlight dimmer switch not in high flash position 11 to 14 V
      G78-19 (FRCY) - Body ground L - Body ground Front door courtesy light switch RH signal Front door RH open Below 1 V
      Front door RH closed Pulse generation
      G78-20 (CLTB) - G78-22 (CLTE)*1 W - V Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON and headlight dimmer switch in AUTO position 11 to 14 V
      G78-21 (CLTS) - Body ground*1 G - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Ignition switch ON
      Headlight dimmer switch in AUTO position
      Automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light      		 Pulse generation (See waveform 1)
      G78-1 (LCTY) - Body ground W - Body ground Rear door courtesy light switch LH signal Rear door LH open Below 1 V
      Rear door LH closed Pulse generation
      G78-27 (FFOG) - Body ground*2 GR - Body ground Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off Pulse generation*3
      11 to 14 V*4
      G78-28 (A) - Body ground*1 G - Body ground Headlight dimmer switch AUTO signal input Headlight dimmer switch in AUTO position Below 1 V
      Headlight dimmer switch not in AUTO position Pulse generation*3
      11 to 14 V*4
      G78-29 (HEAD) - Body ground L - Body ground Headlight dimmer switch head signal input Headlight dimmer switch in head position Below 1 V
      Headlight dimmer switch not in head position 11 to 14 V
      G78-30 (TAIL) - Body ground W - Body ground Headlight dimmer switch tail signal input Headlight dimmer switch in tail or head position Below 1 V
      Headlight dimmer switch in neither tail nor head position 11 to 14 V
      3B-37 (HRLY) - Body ground BR - Body ground H-LP relay drive output Headlight dimmer switch in head position Below 1 V
      Headlight dimmer switch not in head position 11 to 14 V
      3B-52 (DRL) - Body ground G - Body ground Running light relay drive output Daytime running light on Below 1 V
      Daytime running light off 11 to 14 V
      3B-54 (DIM) - Body ground LG - Body ground Running light relay drive output Headlight dimmer switch in high or high flash position Below 1 V
      Headlight dimmer switch not in high or high flash position 11 to 14 V
      3B-56 (FFGO) - Body ground*2 W - Body ground Front fog light signal output Headlight dimmer switch in tail position and front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      3D-34 (PKB) - Body ground B - Body ground Parking brake switch input Parking brake switch on Below 1 V
      Parking brake switch off 11 to 14 V
      3E-33 (BCTY) - Body ground LG - Body ground Back door courtesy light switch signal Back door open Below 1 V
      Back door closed 11 to 14 V
      3E-40 (FLCY) - Body ground W - Body ground Front door courtesy light switch LH signal Front door LH open Below 1 V
      Front door LH closed Pulse generation

      *1: w/ Automatic Light Control System

      *2: w/ Front Fog Light

      *3: Main Body ECU (multiplex network body ECU) with 3 Connectors

      *4: Main Body ECU (multiplex network body ECU) with 1 Connectors

      1. Waveform 1
        Item Content
        Terminal No. (Symbol) G78-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition Ignition switch ON
        Headlight dimmer switch in AUTO position
        Automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light

        HINT: 

        If the ambient light becomes brighter, width A becomes narrower.

        GTY347379Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK COMBINATION METER ASSEMBLY 
    GTY362539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G16 and G17 combination meter connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G16-21 (ET) - Body ground BR - Body ground Ground Always Below 1 Ω
      G16-39 (IG+) - Body ground B - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      G16-40 (B) - Body ground Y - Body ground Battery power supply Always 11 to 14 V
      G17-1 (B) - Body ground L - Body ground Battery power supply Always 11 to 14 V
    3. Reconnect the G16 and G17 combination meter connectors.
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G16-29 (HAZ) - Body ground BE - Body ground Headlight dimmer switch (turn signal switch) left or right turn position signal input Ignition switch ON
      Headlight dimmer switch (turn signal switch) off      		 11 to 14 V
      Ignition switch ON
      Headlight dimmer switch (turn signal switch) in left or right turn position      		 Below 1 V
      G17-3 (HAZ) - Body ground GR - Body ground Hazard warning signal switch signal input Hazard warning signal switch off 11 to 14 V
      Hazard warning signal switch on Below 1 V
      G17-9 (ER) - Body ground SB - Body ground Headlight dimmer switch (turn signal switch) right turn position signal input Ignition switch ON
      Headlight dimmer switch (turn signal switch) off      		 11 to 14 V
      Ignition switch ON
      Headlight dimmer switch (turn signal switch) in right turn position      		 Below 1 V
      G17-10 (EL) - Body ground LG - Body ground Headlight dimmer switch (turn signal switch) left turn position signal input Ignition switch ON
      Headlight dimmer switch (turn signal switch) off      		 Below 1 V
      Ignition switch ON
      Headlight dimmer switch (turn signal switch) in right turn position      		 Below 1 V ←→ 11 to 14 V
      G17-7 (LR) - Body ground L - Body ground RH turn signal light signal output Ignition switch ON
      RH turn signal light off      		 Below 1 V
      Ignition switch ON
      RH turn signal light blinking      		 Below 1 V ←→ 11 to 14 V
      G17-13 (LL) - Body ground Y - Body ground LH turn signal light signal output Ignition switch ON
      LH turn signal light off      		 Below 1 V
      Ignition switch ON
      LH turn signal light blinking      		 Below 1 V ←→ 11 to 14 V
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