Keyless Entry: Description and Operation

System Diagram:

SYSTEM DESCRIPTION

1. WIRELESS DOOR CONTROL SYSTEM DESCRIPTION

a. This system locks and unlocks the vehicle's doors remotely. The wireless control system has the following features:

1. The door control receiver performs the code identification process and the theft warning ECU (theft deterrent ECU) operates the door lock control. A serial data link is provided for communication between the door control receiver and the theft warning ECU.
2. A key-integrated type transmitter is used and it has a door lock switch, door unlock switch and luggage open switch.
3. An LED is mounted on the transmitter to show if the battery is depleted.





2. FUNCTION OF MAIN COMPONENTS

3. SYSTEM FUNCTION

a. Door lock/unlock operation

1. With no key in the ignition key cylinder (KSW OFF) and all door courtesy lamp switches OFF, press the transmitter LOCK or UNLOCK switch. The transmitter will send a faint electrical wave to the door control receiver. The high frequency circuit built into the door control receiver changes the wave into code data, which is then output to the theft warning ECU. The theft warning ECU receives transmitter LOCK/UNLOCK switch signals through the serial communication line. The ECU then sends LOCK/UNLOCK signals to each seat's door ECU through the multiplex communication line.

When each seat's door ECU receives a LOCK/UNLOCK signal, the door's lock position switch will change to ON or OFF.

b. Luggage compartment door open operation

1. With the unlock warning switch OFF, press the door control transmitter's LUGGAGE switch. Similar to door lock/unlock operation, the following occurs: 1)the theft warning ECU receives the LUGGAGE switch signals through the serial communication line; 2) it sends the luggage compartment door open control signals to the luggage room J/B ECU through the multiplex communication line; and 3) then the luggage closer motor will open the luggage compartment door. Also, the luggage compartment door courtesy lamp turns on.

c. Answer-back operation

1. The door unlock detection switch changes from ON to OFF based on operational control signals. The theft warning ECU receives the ON and OFF status of the door unlock detection switch. Once the theft warning ECU receives confirmation that an operation has finished, the ECU: 1)sounds the wireless door lock buzzer, or 2)through the multiplex communication line, sends a hazard warning lamp output control signal to the driver side J/B ECU to blink the hazard warning lamps.

d. Remote panic operation

1. With no key in the ignition key cylinder (KSW OFF) and all door courtesy switches OFF, press and hold the door control transmitter LOCK (PANIC) switch for over 3 seconds. The following occurs: 1) the theft warning ECU activates an interior relay and the security horn sounds, and2) the alarm control signals of the hazard warning lamps, vehicle horn, headlamps and taillamps are sent to each control ECU, starting the theft deterrent alarm.




e. The wireless door lock control system has the following functions: