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Terminals Of Ecu

WARNING: This page is about a different variant/trim than selected.
  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    Fig 1: Instrument Panel Junction Block Assembly & Main Body ECU Connector Terminal Identification
    GTY338660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
    2. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2A-43 - Body ground G - Body ground ACC power supply Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      2B-25 - Body ground B - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      2C-18 (BECU) - Body ground Y - Body ground Auxiliary battery power supply Always 11 to 14 V
      2E-1 - Body ground W - Body ground Auxiliary 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. Measure the resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2B-6 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L8-3 (GND2)*4 - 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 instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
    5. Measure the voltage or check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2B-7 - Body ground BR - Body ground Taillight RH and rear side marker light RH drive output Light control switch in tail position 11 to 14 V
      Light control switch not in tail position Below 1 V
      2B-29 (LSR) - Body ground GR - Body ground Rear door unlock detection switch RH input Rear door RH and LH locked Pulse generation
      Rear door RH or LH unlocked Below 1 V
      2C-8 - Body ground LG - Body ground Front fog lights drive output Light control switch in tail position, front fog light switch on 11 to 14 V
      Light control switch in tail position, front fog light switch off Below 1 V
      2C-10 - Body ground BR - Body ground Parking lights and front side marker lights drive output Light control switch in tail position 11 to 14 V
      Light control switch not in tail position Below 1 V
      2C-20 (PKB) - Body ground R - Body ground Parking brake switch input Parking brake switch on Below 1 V
      Parking brake switch off 11 to 14 V
      2C-22 (DIM) - Body ground Y - Body ground High beam headlights drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V
      2C-32 (HRLY) - Body ground G - Body ground Headlight relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      2C-35 (DRL) - Body ground L - Body ground Daytime running light system drive output Daytime running light system operating Below 1 V
      Daytime running light system not operating 11 to 14 V
      2D-18 - Body ground BR - Body ground Taillight LH, rear side marker light LH and license plate lights drive output Light control switch in tail position 11 to 14 V
      Light control switch not in tail position Below 1 V
      2D-25 (LSR) - Body ground GR - Body ground Rear door unlock detection switch LH input Rear door LH and RH locked Pulse generation
      Rear door LH and RH unlocked Below 1 V
      2D-35 (FLCY) - Body ground V - Body ground Front door courtesy light switch LH input Front door LH open Below 1 V
      Front door LH closed 11 to 14 V
      2D-36 (FRCY) - Body ground BR - Body ground Front door courtesy light switch RH input Front door RH open Below 1 V
      Front door RH closed 11 to 14 V
      L7-6 (LRCY) - Body ground G - Body ground Rear door courtesy light switch RH or LH input Rear door RH or LH open Below 1 V
      Rear door RH and LH closed Pulse generation
      L7-7 (LSFL) - Body ground GR - Body ground Front door unlock detection switch LH input Front door LH locked Pulse generation
      Front door LH unlocked Below 1 V
      L7-8 (HF) - Body ground LG - Body ground Dimmer switch high flash position signal input Dimmer switch in high flash position Below 1 V
      Dimmer switch not in high flash position Pulse generation
      L7-18 (LSFR) - Body ground LG - Body ground Front door unlock detection RH switch input Front door RH locked Pulse generation
      Front door RH unlocked Below 1 V
      L7-19 (BCTY) - Body ground L - Body ground Back door courtesy light switch input Back door open Below 1 V
      Back door closed 11 to 14 V
      L7-20 (CLTB) - L7-22 (CLTE)*1 R - B Automatic light control sensor power supply output Power switch off Below 1 V
      Power switch on (IG) and light control switch in AUTO position 11 to 14 V
      L7-21 (CLTS)*1 - Body ground W - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Automatic light control system operates Pulse generation
      (See waveform 1)
      L7-27 (FFOG)*2 - Body ground LG - Body ground Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off Pulse generation
      L7-28 (A)*1 - Body ground W - Body ground Light control switch AUTO position signal input Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position Pulse generation
      L7-28 (A)*3 - Body ground W - Body ground Light control switch DRL position signal input Light control switch in DRL position Below 1 V
      Light control switch not in DRL position Pulse generation
      L7-29 (HEAD) - Body ground L - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position Pulse generation
      L7-30 (TAIL) - Body ground Y - Body ground Light control switch tail position signal input Light control switch in tail or head position Below 1 V
      Light control switch in neither tail nor head position 11 to 14 V
      • *1: w/ Automatic Light Control
      • *2: w/ Front Fog Light
      • *3: Light control switch w/ DRL position
      • *4: w/ Separate Type Amplifier

      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.

      1. Waveform 1
        Fig 2: Identifying Waveform 1
        GTY123970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Content
        Tool setting 5 V/DIV., 5 ms./DIV.

        HINT: 

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

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