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Home >> Lexus >> 2016 >> RC 350 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Lighting System (Ext) - Diagnostics - Introduction) >> Lighting System >> System Description [09/2020 - 11/2021] >> System Description [09/2020 - 11/2021]
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System Description [09/2020 - 11/2021]

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  1. AUTOMATIC LIGHT CONTROL SYSTEM 

    When the light control switch is in the AUTO position, the automatic light control system detects ambient light levels and controls the low beam headlights, parking lights, side marker lights, taillights and license plate lights.

  2. LIGHT AUTO TURN-OFF SYSTEM 

    The light auto turn-off system is used to prevent the exterior lights from being accidentally left on (headlights, taillights, parking lights, license plate lights and side marker lights).

    • This system has the following functions.
    Function Outline
    Delay Function The exterior lights automatically turn off after 30 seconds when all of the following conditions are met:
    • The engine switch is turned from on (IG) to off.
    • The low beam headlights are on.
    • All doors are closed after any of the doors are opened.
    Door Control Transmitter-linked Function The exterior lights turn off immediately when the delay function is active and the following condition is met:
    • The lock button on the key is pushed after all doors are locked.
    Door Open-linked The exterior lights automatically turn off immediately when all of the following conditions are met:
    • The engine switch is turned from on (IG) to off.
    • The taillights are on. (The low beam headlights are off.)
    • The driver door is opened.
  3. DAYTIME RUNNING LIGHT SYSTEM 

    The daytime running light system is designed to automatically illuminate the daytime running lights (high-intensity parking lights) during the daytime to make the vehicle more visible to other vehicles.

    • This system is controlled by the main body ECU (multiplex network body ECU).
    • There are 2 LED type parking light circuits in each clearance light assembly. One is for a conventional low-intensity parking light that illuminates with the taillights, and the other is for the high-intensity parking light that is used for the DRL system.
    • This system is enabled when the following conditions are met:
      • The engine switch is on (IG).
      • The engine speed signal is input (engine running).
      • The turn signal switch and hazard warning signal switch is off.
      • The light control switch is in the off, tail or AUTO position (and the low beam headlights are not turned on via the automatic light control system). (w/o DRL OFF Switch)
      • The light control switch is in the tail or AUTO position (and the low beam headlights are not turned on via the automatic light control system). (w/ DRL OFF Switch)
      • The parking brake operation signal is off.
  4. WELCOME LIGHT ILLUMINATION CONTROL 

    When a wireless door unlock operation or entry door unlock operation is performed at nighttime, the parking lights illuminate for 15 seconds.

  5. OUTSIDE HANDLE FOOT LIGHT CONTROL 
    1. General
      • The outside handle foot light control consists primarily of the fade-in/fade-out/2 steps fade-out function and timer illumination function.
      • This control is controlled by the main body ECU (multiplex network body ECU). According to various information, the main body ECU (multiplex network body ECU) performs fade-in/fade-out/2 steps fade-out control of the outside handle foot lights.
    2. The outside handle foot light control has the following control functions:
      Function Outline
      Actuation Area-linked When all of the following conditions are met, the lights that operate fade-in:
      • The engine switch is off.
      • All doors are closed.
      • A key is detected in the actuation area.
      When the following condition is met, the lights that operate fade-out:
      • A key is not detected in the actuation area.
      Door Lock/Unlock-linked When all of the following conditions are met, the lights that operate fade-in:
      • The engine switch is off.
      • All doors are closed.
      • Any door is unlocked when all doors are locked.
      When either of the following conditions is met, the lights that operate fade-out:
      • All doors are locked when all doors are closed and any door is unlocked.
      • All doors are locked again when all doors are closed and locked.
      Door Open/Close-linked When the following conditions is met, the lights that operate fade-in:
      • The engine switch is off, any door is open.
      When the following conditions is met, the lights that operate fade-in:
      • Any door is closed or opened.
      Engine Switch-linked When the following condition is met, the lights that operate fade-out:
      • The engine switch is on (IG).
      Delay When approximately 15 seconds elapse after any of the following conditions are met, the lights that operate fade-out:
      • An actuation area-linked function is used.
      • The door unlock-linked function is active.
      • Any door is opened and then closed.
  6. CORNERING LIGHT CONTROL 
    1. The cornering light control ensures the visibility of the area ahead when driving around a corner by turning on the cornering light in the direction the vehicle is turning. The cornering lights are installed to the front bumper.
    2. This control is controlled by the No. 1 headlight ECU sub-assembly.
    3. The cornering lights operate as follows when the vehicle is being driven at 30 km/h (19 mph) or less with the low beam headlights illuminated.
      • When the turn signal switch is moved to the right turn position, the cornering light RH illuminates. When the turn signal switch moves to the neutral position, the cornering light RH will turn off.
      • When the turn signal switch is moved to the left turn position, the cornering light LH illuminates. When the turn signal switch moves to the neutral position, the cornering light LH will turn off.
      • When the steering wheel is turned 80 degrees or more to the right, the cornering light RH illuminates. When the steering wheel is returned to an angle 30 degrees or less, the cornering light RH will turn off.
      • When the steering wheel is turned 80 degrees or more to the left, the cornering light LH illuminates. When the steering wheel is returned to an angle 30 degrees or less, the cornering light LH will turn off.
    4. When all of the following conditions are met, the cornering light LH and cornering light RH will turn on:
      • The engine switch is on (IG).
      • The low beam headlights are illuminated.
      • The shift lever is in R.