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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clock Assembly (without Navigation System) 
    Fig 1: Identifying Terminals Of ECU
    G04050668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL SPECIFICATION TABLE

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    ILL+ (J54-3) - Body ground G - Body ground Illumination Signal Combination switch OFF Below 1 V
    Combination switch Head 10 to 14 V
    IG+ (J54-4) - Body ground B - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    ACC (J54-5) - Body ground O - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    E (J54-8) - Body ground W-B - Body ground Ground Always Below 1 V
    ILL-(J54-10) - Body ground LG - Body ground Illumination Signal Engine switch on (IG), combination switch Head, and light control rheostat position MAX. Pulse generation (See waveform)
    B (J54-14) - Body ground LG - Body ground Battery Always 10 to 14 V
    1. Waveform (Reference): Using an oscilloscope:

      OK: 

    WAVEFORM REFERENCE TABLE

    Item Condition
    Tool setting 5 V/DIV., 200 ms./DIV.
    Vehicle condition Engine switch on (IG), light control rheostat is in the MID. position.
    Fig 2: Identifying Wave Graph
    G04050669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Clock Assembly (with Navigation System) 
    Fig 3: Identifying Clock Assembly (With Navigation System) Connector Terminal
    G04050670Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL SPECIFICATION TABLE

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    E (J53-2) - Body ground W-B - Body ground Ground Always Below 1 V
    ILL+ (J53-4) - Body ground G - Body ground Illumination Signal Combination switch OFF Below 1 V
    Combination switch Head 10 to 14 V
    ACC (J53-5) - Body ground W-B - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    +B (J53-6) - Body ground BR - Body ground Battery Always 10 to 14 V
    ILL - (J53-10) - Body ground W - Body ground Illumination Signal Engine switch on (IG), combination switch Head, and light control rheostat position MAX. Pulse generation (See waveform)
    IG (J53-11) - Body ground B - Body ground Ignition Switch Signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    1. Waveform (Reference): Using an oscilloscope:

      OK: 

      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 5 V/DIV., 200 ms./DIV.
      Vehicle condition Engine switch on (IG), light control rheostat is in the MID. position.
    Fig 4: Identifying Wave Graph
    G04050671Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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