Keyless Entry: Description and Operation

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: 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:

* The door control receiver performs the code identification procedure and the main body ECU operates the door lock control. A serial data link is provided for communication between the receiver and main 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.

2. FUNCTION OF MAIN COMPONENTS





3. SYSTEM FUNCTION

(a) Door lock / unlock function:

* With no key in the ignition key cylinder (unlock warning switch is OFF) and all door courtesy switches OFF, pressing the door control transmitter's LOCK / UNLOCK switch causes the transmitter to output faint electric waves. The transmitter sends the faint electrical wave to the door control receiver. The high frequency circuit built into the door control receiver demodulates the wave into code data, computes the data, and compares the data with previously registered ID codes. If the data is verified, a door lock / unlock request signal is output to the main body ECU. When the request signal is received, the main body ECU outputs a door lock / unlock control signal to each door lock assembly. Each door lock assembly then locks / unlocks its respective door and turns ON / OFF its door lock position switch in accordance with the signal.

(b) Answer-back function:

* The main body ECU receives the door unlock detection switch's ON / OFF signals and uses these signals to confirm if the door control operation has been completed. The main body ECU then outputs the hazard warning light control signals to flash the hazard warning lights and the wireless door lock buzzer control signals to sound the wireless door lock buzzer as an answer-back indication.

(c) The wireless door lock control system has the following functions.