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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 [11/2023 - ] >> Terminals Of Ecu [11/2023 - ]

Terminals Of Ecu [11/2023 - ]

  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY 
    Fig 1: Check Main Body ECU (Multiplex Network Body ECU) And Power Distribution Box Assembly [11/2023 - ]
    GTY1177775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

    2. Reconnect the power distribution box assembly connectors.
    3. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      MB-26 (BECU) - Body ground Auxiliary battery power supply Always 11 to 14 V
      MB-27 (IGR) - Body ground IG power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      MB-22 (CXP1) - Body ground CXPI communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
    4. Install the main body ECU (multiplex network body ECU) to the power distribution box assembly.

      Refer to INSTALLATION [11/2023 - ]

    5. Connect the power distribution box assembly and main body ECU (multiplex network body ECU) connectors.
    6. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      8C-9 - Body ground Front door courtesy light switch RH input Front door RH open Below 1 V
      Front door RH closed 11 to 14 V or pulse output (maximum 14 V)*1
      8G-3 - Body ground Front door courtesy light switch LH input Front door LH open Below 1 V
      Front door LH closed 11 to 14 V or pulse output (maximum 14 V)*1
      8G-31 - Body ground Rear door courtesy light switch RH input Rear door RH open Below 1 V
      Rear door RH closed 11 to 14 V or pulse output (maximum 14 V)*1
      8G-24 - Body ground Rear door courtesy light switch LH input Rear door LH open Below 1 V
      Rear door LH closed 11 to 14 V or pulse output (maximum 14 V)*1
      8G-2 - Body ground Back door courtesy light switch input Back door open Below 1 V
      Back door closed 11 to 14 V or pulse output (maximum 14 V)*1
      8C-4 - Body ground Each interior lights power supply DOME CUT relay off Below 1 V
      DOME CUT relay on 11 to 14 V
      8G-20 - Body ground Each interior lights power supply DOME CUT relay off Below 1 V
      DOME CUT relay on 11 to 14 V
      8G-22 - Body ground Instrument panel illumination power supply PANEL relay off Below 1 V
      PANEL relay on 11 to 14 V
      8C-53 - Body ground Instrument panel illumination power supply PANEL relay off Below 1 V
      PANEL relay on 11 to 14 V
      8C-18 - Body ground Ambient illumination lights ground*2 Ambient illumination light off 11 to 14 V
      Ambient illumination light on Below 1 V
      H135-3 (LSFR) - Body ground Front door unlock detection switch RH input Front door RH locked 11 to 14 V
      Front door RH unlocked Below 1 V
      H135-9 (LSFL) - Body ground Front door unlock detection switch LH input Front door LH locked 11 to 14 V
      Front door LH unlocked Below 1 V
      H136-23 (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
      H135-10 (LSWL) - Body ground Rear door unlock detection switch LH input Rear door LH locked 11 to 14 V
      Rear door LH unlocked Below 1 V
      H135-5 (ILE) - Body ground Illuminated entry system drive output Illuminated entry system inactive 11 to 14 V
      Illuminated entry system operation Below 1 V
      H136-18 (FRCL) - Body ground Courtesy light assembly RH ground Courtesy light assembly RH off 11 to 14 V
      Courtesy light assembly RH on Below 1 V
      H136-19 (FLCL) - Body ground Courtesy light assembly LH ground Courtesy light assembly LH off 11 to 14 V
      Courtesy light assembly LH on Below 1 V

      *1: Differs depending on the vehicle model

      *2: w/ Ambient Illumination Light

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    Fig 2: Check Certification ECU (Smart Key ECU Assembly) [11/2023 - ]
    GTY1178468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H138-20 (SWIL) - H138-30 (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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