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Home >> Lexus >> 2012 >> IS 350C >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Lock Control System (Diagnostics - Introduction) >> Power Door Lock Control System >> System Description >> System Description
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System Description

  1. POWER DOOR LOCK CONTROL SYSTEM DESCRIPTION 
    1. The power door lock control system locks/unlocks all doors.
      • The driver and front passenger side door control switches send lock/unlock request signals to the main body ECU RH (cowl side junction block RH) by multiplex communication (BEAN). Then, the main body ECU RH (cowl side junction block RH) sends these request signals to the door lock motors in each door to lock/unlock all doors at once in response to the inputs.
      • The driver door key cylinder lock/unlock request signals are sent to the power window regulator master switch assembly. Then, the power window regulator master switch assembly sends these request signals to the main body ECU RH (cowl side junction block RH) by multiplex communication (BEAN).
  2. FUNCTION OF MAIN COMPONENTS 
    Component Function
    Door control switch (power window regulator master switch assembly) Driver side door control switch on the power window regulator master switch assembly locks or unlocks all doors.
    Door control switch (power window regulator switch assembly) Front passenger side door control switch on the power window regulator switch assembly locks or unlocks all doors.
    Front door courtesy light switch assembly
    • Placed on each door.
    • Detects door status (open or closed) and outputs data to main body ECU RH (cowl side junction block RH).
    • Turns on when door is opened and turns off when door is closed.
    Front door lock assembly (for driver side)
    • Built-in motor locks or unlocks door.
    • Built-in key lock and unlock switch detects door key operation status (locked or unlocked) and outputs a signal to power window regulator master switch assembly.
    • Built-in door unlock detection switch detects door status (locked or unlocked) and outputs a signal to power window regulator master switch assembly. This switch turns off when door is locked and turns on when door is unlocked.
    Front door lock assembly (for front passenger side)
    • Built-in motor locks or unlocks door.
    • Built-in door unlock detection switch detects door status (locked or unlocked) and outputs a signal to main body ECU RH (cowl side junction block RH). This switch turns off when door is locked and turns on when door is unlocked.
    Luggage compartment door lock
    • Built-in motor opens door.
  3. SYSTEM FUNCTION 
    1. This system is controlled by the main body ECU RH (cowl side junction block RH). The main body ECU RH (cowl side junction block RH) outputs signals to each door lock motor. The power door lock control system has the following functions:
      Function Outline
      Manual lock and unlock function This function can lock or unlock all doors by the door control switch operation.
      Key-linked lock and unlock function This function, which is linked with the mechanical key cylinder, can lock or unlock all doors when a lock or unlock operation is effected.
      Manual unlock prohibition function When the condition below is met, unlocking the vehicle using the door control switch will be prohibited:
      • The doors are locked using a mechanical key, door control transmitter or entry lock operation with all doors closed.
      Key lock-in prevention function When the key is in the vehicle, performing the door lock operation will not lock all doors.
      Collision door lock release If the SRS has been deployed and the main body ECU RH (cowl side junction block RH) has detected the signal that is output from the center airbag sensor assembly, the main body ECU RH (cowl side junction block RH) will unlock all doors.
      Key-linked 2-step unlock function Unlocks only the driver door by turning the key cylinder once and unlocks the other doors by turning it twice.
      Shift-linked automatic door lock function*1, *2 When the conditions listed below are met consecutively, this function causes all doors to be automatically locked:
      • All doors are closed.
      • The engine is started.
      • The shift lever is moved out of P.
      Shift-linked automatic door unlock function*1 When the conditions listed below are met consecutively, this function causes all doors to be automatically unlocked:
      • The engine switch is on (IG).
      • The shift lever is moved to P from any position other than P.
      Speed-sensitive automatic door lock function*3 When the conditions listed below are met consecutively, this function causes all doors to be automatically locked:
      • Vehicle speed is higher than approximately 20 km/h (12 mph).
      • All doors are closed.
      • Any of the doors is unlocked.
      Opening driver door-linked automatic door unlock*4 All doors are unlocked automatically when the driver door is opened within approximately 45 seconds after the engine switch is turned from on (IG) to off.
      • *1: for A/T
      • *2: The default setting for models without the Occupant Classification System is OFF
      • *3: The default setting for models with the Occupant Classification System and A/T is OFF
      • *4: The default setting for A/T is OFF
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