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Terminals Of Ecu

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  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 2B, 2C, 2E and L8 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
      2C-18 - Body ground Y - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      2E-1 - Body ground W - Body ground Auxiliary battery power supply Power switch off 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-4 - Body ground W-B - Body ground Ground Always Below 1 Ω
      2B-6 - Body ground W-B - Body ground Ground Always Below 1 Ω
      L8-3 (GND2) - Body ground*2 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 2B, 2C, 2E and L8 instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
    5. 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
      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
      2A-52 - Body ground L - Body ground Interior lights drive output Power switch off, interior lights off (when operated by illuminated system) 11 to 14 V
      Power switch off, interior lights on (when operated by illuminated system) Below 1 V
      2B-17 - Body ground*1 L - Body ground Footwell light RH drive output Footwell light RH off 11 to 14 V
      Footwell light RH on Below 1 V
      2B-18 - Body ground*1 L - Body ground Footwell light LH drive output Footwell light LH off 11 to 14 V
      Footwell light LH on Below 1 V
      2B-13 - Body ground V - Body ground Courtesy light (LH) drive output Courtesy light (LH) off 11 to 14 V
      Courtesy light (LH) on Below 1 V
      2B-31 - Body ground B - Body ground Courtesy light (RH) drive output Courtesy light (RH) off 11 to 14 V
      Courtesy light (RH) on Below 1 V
      2D-35 - 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 - 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 and LH input Rear door RH or LH open Below 1 V
      Rear door RH and LH closed Pulse generation
      L7-19 (BCTY) - Body ground L - Body ground Back door courtesy light switch input Back door open Below 1 V
      Back door closed and luggage compartment light switch on 11 to 14 V
      Back door closed and luggage compartment light switch off 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
      L7-18 (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
      2D-25 - Body ground GR - Body ground Rear door unlock detection switch LH input Rear door LH and RH locked Pulse generation
      Rear door LH or RH unlocked Below 1 V
      2B-29 - Body ground GR - Body ground Rear door unlock detection switch RH input Rear door LH and RH locked Pulse generation
      Rear door LH or RH unlocked Below 1 V
      • *1: w/ Footwell Light
      • *2: 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.
  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    Fig 2: Certification ECU Connector Terminal Identification
    GTY219896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. 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
      L62-11 (SWIL) - Body ground G - Body ground Power switch illumination drive output Power switch illumination on 11 to 14 V or pulse generation
      Power switch illumination off Below 1 V

      If the result is not as specified, the certification ECU (smart key ECU assembly) may have a malfunction.

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