System Description

• The door control receiver performs the code identification process and the multiplex network body ECU operates the door lock control. A serial data link is provided for communication between the door control receiver and multiplex network body ECU.
• A key-integrated type transmitter is used and it contains the following 3 switches: the door lock switch, door unlock switch and panic switch.
• An LED is mounted on the transmitter to show if the battery is depleted.

With no key in the key slot (halfway switch is off) and all door courtesy lamp switches off, pressing the door control transmitter's LOCK/UNLOCK switch causes the transmitter to output electric waves which are then input to the door control receiver. The door control receiver converts these waves into code data in its internal high frequency circuit, and outputs the code data to the multiplex network body ECU. The door control receiver and smart key ECU evaluate the code data (recognition codes and function codes) and output the evaluation results to the multiplex network body ECU. Upon receiving a door lock/unlock request signal, the multiplex network body ECU outputs a door lock/unlock control signal to each door lock assy. Each door lock assy then locks/unlocks its respective door and turns on/off its door lock position switch according to the signal.

The multiplex network body ECU receives the door unlock detection switch's on/off signals and uses these signals to confirm if door control operation has completed. The multiplex network body ECU then outputs the hazard warning lamp's output control signals to flash the hazard warning lamp as an answer-back and wireless door lock buzzer signals to cause the wireless door lock buzzer to sound as an answer-back.

When the door control transmitter's PANIC switch is pressed, the door control receiver and smart key ECU evaluate the code data (recognition codes and function codes) from the door control transmitter in the same way as when the LOCK/UNLOCK switch is pressed. Upon receiving a theft deterrent alarm control signal from the smart key ECU, the multiplex network body ECU actuates a built-in relay to cause the security horn to sound, as well as transmit several kinds of warning signals (hazard warning lamp control signal, vehicle horn warning control signal, headlamp warning signal and tail lamp warning signal) in order to output a theft-deterrent alarm.