GENERAL INFORMATION



The keyless operation system (KOS) enables the driver to lock or unlock all the doors (including the tailgate) by just operating the lock/unlock switch on the front door outside handles or operating the tailgate lock release handle (tailgate open switch, tailgate lock switch), without taking the keyless operation key out from his/her pocket or bag when he/she is carrying a keyless operation key which has been registered in the vehicle’s KOS-ECU (Door entry function). The KOS also allows the driver to start the engine without using the conventional mechanical key (engine start function). Moreover, the KOS incorporates the keyless entry function with which, like the conventional keyless entry system, a driver can perform the remote operation (opening/closing of all the doors and the tailgate) by using the lock/unlock switch of the keyless operation key and the immobilizer function that prohibits the starting of engine by using an unauthorised key. The KOS has the following features:



CONSTRUCTION DIAGRAM










Main components and functions
Parts name
Functional description
KOS-ECU
Controls KOS by using the following inputs/outputs and communications.

  • Input of front door lock/unlock switch, input of tailgate lock release handle, and input of tailgate lock switch
  • Communications with ETACS-ECU, OSS-ECU and combination meter via CAN
  • Wireless communication of keyless operation key via the interior and exterior transmitter antennas as well as via the key slot integrated antenna
  • Output to the outer buzzer
  • Output of actuator driving permission signal to electric steering lock
Electric steering lock (incorporates electric steering lock unit)
The steering lock mechanism incorporates a mechanism that can electrically unlock the lock. When the lock is unlocked electrically, the steering lock is unlocked approximately for 30 seconds by the certification communication with OSS-ECU via LIN communication, the power supply permission signal obtained via wire communication, and the actuator driving permission signal received via wire communication from KOS-ECU.
Keyless operation key (incorporates emergency key)

  • The keyless operation key receives signals sent from each interior/exterior transmitter antenna, certifies the key ID code, calculates the encrypted code, and sends the reply data signal to KOS-ECU. If the integrated battery is discharged, the keyless operation key receives signals sent from the key slot when it is inserted in the key slot. Then, it certifies the key ID code, calculates the encrypted code, and sends the reply data signal to KOS-ECU via the key slot. Also, when the lock/unlock switch on the keyless operation key is pressed, the corresponding signal is sent to KOS-ECU.
  • If two or more keyless operation keys registered in KOS-ECU respond at the same time, their signals would interfere. To avoid this interference, each signal from KOS-ECU is given the priority* data, and the keyless operation keys respond in accordance with this priority.

Lock/Unlock switch
Driver’s side
Locks/unlocks all the doors and tailgate when the driver carrying the keyless operation key presses the lock/unlock switch on the front door outside handle.
Passenger’s side
Tailgate lock release handle
Unlocks all the doors and the tailgate when a driver carrying the keyless operation key presses the tailgate lock release handle.
Tailgate lock switch
Locks all the doors and tailgate when the driver carrying the keyless operation key presses the lock switch on the tailgate lock release handle.
Exterior transmitter antenna assembly
Driver’s side
Converts the data output from KOS-ECU via wire into a signal, and sends it to the keyless operation key (For more information on the transmission/reception area, refer to the door entry function valid area ).
Passenger’s side
Tailgate
Interior transmitter antenna assembly
Front
Converts the data output from KOS-ECU via wire into a signal, and sends it to the keyless operation key (For more information on the transmission/reception area, refer to the one-touch start system valid area ).
Rear
Outer buzzer
The outer buzzer sounds when:

  • The doors are locked or unlocked by the door entry function.
  • The keyless operation key is carried out of the vehicle when the power supply mode is other than OFF, and the door is closed.
  • The lock/unlock switch on the front door outside handle is pressed when the power supply mode is other than OFF.
  • The lock/unlock switch on the front door outside handle is pressed when the keyless operation key is still located inside the car.
  • The lock/unlock switch on the front door outside handle is pressed when the door is ajar.
  • With the driver’s door kept open, the keyless operation key is not removed from the key slot located in the glove box.
Key slot
Converts the data output from KOS-ECU via wire into a signal, sends it to the keyless operation key, and then sends the reply data signal from keyless operation key to KOS-ECU.
OSS-ECU
Controls OSS by using the following inputs/outputs and communications.

  • Input from the engine switch
  • Input from stop lamp switch
  • Input from P range detection switch
  • Input of monitoring signal for actuator driving permission of electric steering lock via wire communication with KOS-ECU
  • Output of KOS back-up power supply via wire communication with KOS-ECU
  • Power supply output to electric steering lock unit
  • CAN communication with KOS-ECU, ETACS-ECU, engine ECU, and combination meter
  • LIN communication with electric steering lock
Engine switch

  • Output of engine switch ON/OFF signal to OSS-ECU
  • Input of LED signal from OSS-ECU

Combination meter (keyless operation alarm display)
Communicates with KOS-ECU and OSS-ECU via CAN. Receives the warning request or warning information from KOS-ECU and OSS-ECU, and displays the warning.
ETACS-ECU

  • Communicates with KOS-ECU via CAN. By the door lock/unlock request or tailgate lock/unlock request from KOS-ECU, ETACS-ECU outputs the lock/unlock signal. When the door lock/unlock signal is output, the ETACS-ECU flashes or illuminates the turn-signal lamps and the room lamp to notify the driver that the doors are locked/unlocked. Furthermore, by the multi-mode function of keyless entry, the folding/unfolding of door mirrors is performed depending on the pattern of door lock/unlock request from KOS-ECU.
  • Communicates with OSS-ECU via CAN, and outputs the door switch ON/OFF signal.
  • Receives the ACC output signal or IG1 output signal sent from OSS-ECU via wire communication, and drives the ACC relay or supplies electrical current to the IG1 relay to drive the IG1 relay.
  • Using the welcome light function, the headlamps and tail lamps are illuminated by the door unlock request from KOS-ECU.

Engine-ECU
Communicates with OSS-ECU through ETACS-ECU via CAN. Permits/inhibits the engine starting and controls the engine operation.
note *: When registering the keyless operation keys, KOS-ECU numbers each key (1 to 4) in the order they are registered (initial priority). This priority is renewed each time the doors are locked/unlocked and the engine switch is pressed. For example, when only keys 1 and 3 have responded to the signal sent from KOS-ECU, the new priority of the keys would be 1-3-2-4. When keys 3 and 4 have responded, then the priority of the keys becomes 3-4-1-2.

System configuration