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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System (Int) - Diagnostics & Circuit Tests (1 Of 2) >> Lighting System >> Terminals Of Ecu [12/2019 - 11/2023] >> Terminals Of Ecu [12/2019 - 11/2023]

Terminals Of Ecu [12/2019 - 11/2023]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    Fig 1: Check Main Body ECU (Multiplex Network Body ECU) And Instrument Panel Junction Block Assembly [12/2019 - 11/2023]
    GTY848255Courtesy 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 and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      4C-1 - Body ground Auxiliary battery power supply Always*1
      Ignition switch off*2      		 11 to 14 V
      4F-1 - Body ground Auxiliary battery power supply Always*1
      Ignition switch off*2      		 11 to 14 V
      4B-3 - Body ground Ground Always Below 1 Ω
      H42-19 (GND2) - Body ground Ground Always Below 1 Ω

      *1: for Gasoline Model

      *2: for HV Model

    3. Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
    4. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      4A-17 - Body ground IG power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      4A-30 - Body ground ACC power supply Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      4A-31 - Body ground Rear door courtesy light switch assembly (for RH) input Rear door RH open Below 1 V
      Rear door RH closed 11 to 14 V
      4B-9 - Body ground Courtesy light assembly power supply DOME CUT relay on 11 to 14 V
      DOME CUT relay off Below 1 V
      4B-10 - Body ground Map light assembly, spot light assembly, No. 1 room light assembly and vanity light assembly power supply DOME CUT relay on 11 to 14 V
      DOME CUT relay off Below 1 V
      4B-12 - Body ground Front door unlock detection switch RH input Front door RH locked 11 to 14 V
      Front door RH unlocked Below 1 V
      4B-13 - Body ground Front door unlock detection switch LH input Front door LH locked 11 to 14 V
      Front door LH unlocked Below 1 V
      4B-14 - Body ground Rear door unlock detection switch LH input Rear door LH locked 11 to 14 V
      Rear door LH unlocked Below 1 V
      4B-24 - Body ground*1*2 Center tray illumination light (No. 1 instrument panel light sub-assembly), front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) and door ambient light (door trim board sub-assembly) power supply Always 11 to 14 V
      4B-29 - Body ground Illuminated entry system drive output Map light assembly, spot light assembly and No. 1 room light assembly off (when operated by illuminated entry system) 11 to 14 V
      Map light assembly, spot light assembly and No. 1 room light assembly on (when operated by illuminated entry system) Below 1 V
      4D-24 - Body ground Rear door courtesy light switch assembly (for LH) input Rear door LH open Below 1 V
      Rear door LH closed 11 to 14 V
      4D-34 - Body ground Back door lock assembly with courtesy light switch input Back door open Below 1 V
      Back door closed 11 to 14 V
      H43-17 (LSWR) - Body ground Rear door unlock detection switch RH input Rear door RH locked 11 to 14 V
      Rear door RH unlocked Below 1 V
      H43-1 (FLCY) - Body ground Front door courtesy light switch assembly (for LH) input Front door LH open Below 1 V
      Front door LH closed 11 to 14 V
      H43-2 (FLCL) - Body ground Courtesy light assembly LH drive output Courtesy light assembly LH off 11 to 14 V
      Courtesy light assembly LH on Below 1 V
      H43-3 (FRCL) - Body ground Courtesy light assembly RH drive output Courtesy light assembly RH off 11 to 14 V
      Courtesy light assembly RH on Below 1 V
      H43-6 (FRCY) - Body ground Front door courtesy light switch assembly (for RH) input Front door RH open Below 1 V
      Front door RH closed 11 to 14 V
      H44-20 (LED1) - Body ground*1 Center tray illumination light (No. 1 instrument panel light sub-assembly), front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) and door ambient light (door trim board sub-assembly) drive output Center tray illumination light (No. 1 instrument panel light sub-assembly), front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) and door ambient light (door trim board sub-assembly) off 11 to 14 V*2
      10.5 to 16 V*3
      Center tray illumination light (No. 1 instrument panel light sub-assembly), front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) and door ambient light (door trim board sub-assembly) dimmer control operating (dimming) Pulse generation
      Center tray illumination light (No. 1 instrument panel light sub-assembly), front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) and door ambient light (door trim board sub-assembly) at full brightness Below 2.2 V

      *1: w/ Ambient Illumination Light

      *2: w/o Stop and Start System

      *3: w/ Stop and Start System

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    Fig 2: Check Certification ECU (Smart Key ECU Assembly) [12/2019 - 11/2023]
    GTY912453Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *A For Gasoline Model - -
    1. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H48-10 (SWIL) - H48-11 (AGND) Push start switch illumination drive output Push start switch illumination on 11 to 14 V
      Push start switch illumination off Below 1 V
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