System Description

WIRELESS DOOR LOCK CONTROL SYSTEM DESCRIPTION
1. This system locks and unlocks the vehicle's doors remotely. The wireless door lock control system has the following features:
  - The door control receiver performs the code identification process and the main body ECU operates the door lock control. A serial data link is provided for communication between the door control receiver and main body ECU.
  - A key-integrated type transmitter is used and it contains the following 3 switches: the LOCK switch, UNLOCK switch and PANIC switch.
  - An LED is mounted on the transmitter to show if the battery is depleted.

FUNCTION OF MAIN COMPONENTS

Components	Functions
Door control transmitter	Contains LOCK, UNLOCK and PANIC switches Transmits faint electric wave (recognition codes and function codes) to door control receiver Illumination indicator light (LED) during transmission
Door control receiver	Receives faint electric waves (recognition code and function codes) and outputs them as code data to main body ECU
Key slot (halfway switch)	Detects if key slot has key or not
Front door courtesy light switch Rear door courtesy light switch Back door courtesy light switch	Turns on when door is open and turns off when door is closed. Outputs door status (open or closed) to main body ECU.
Door lock position switch	Transmits door lock positions of each door to main body ECU

SYSTEM FUNCTION

Door lock/unlock function:
With no key in the key slot (halfway switch is off) and all courtesy light switches off, pressing the door control transmitter's LOCK/UNLOCK switch causes the transmitter to output electric waves which are 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 main body ECU. The door control receiver and certification ECU evaluate the code data (recognition codes and function codes) and output the evaluation results to the main body ECU. Upon receiving a door lock/unlock request signal, the main body ECU outputs a door lock/unlock control signal to each door lock. Each door lock then locks/unlocks its respective door and turns on/off its door lock position switch according to the signal.
Answer-back function:
The main 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 main body ECU then outputs the hazard warning light's output control signal to flash the hazard warning light as an answer-back and wireless door lock buzzer signals to cause the wireless door buzzer to sound as an answer-back.
Panic function:
When the door control transmitter's PANIC switch is pressed, the door control receiver and certification 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 certification ECU, the main body ECU actuates a built-in relay to causer the security horn to sound, as well as transmit several kinds of warning signals (hazard warning light control signal, vehicle horn warning control signal, headlight warning signal and taillight warning signal) in order to output a theft deterrent alarm.

The wireless door lock control system has the following functions.

DOOR FUNCTION CHART

Function	Outline
All door unlock function	Pressing LOCK switch locks all doors
All door unlock function (for 2 step unlock operation)	Pressing UNLOCK switch once will unlock driver side door. Pressing UNLOCK switch again within 3 seconds will unlock remaining doors.
Answer-back function	Hazard warning lights flash once when doors are locked, and flash twice when doors are unlock to inform that operation has been completed Wireless door lock buzzer sounds once when doors are locked and sounds twice when doors are unlocked to inform that operation has been completed
Panic function	Holding down PANIC switch sets off theft deterrent alarm, which consists of sounding horn, and flashing headlights, taillights and hazard warning lights
Automatic lock function	If no doors are opened within 30 seconds after they are unlocked by wireless door lock remote control, all doors will lock again automatically
Repeat function	If door is not locked in response to locking operation of transmitter, main body ECU will output lock signal after 1 second
Illuminated entry function	With all doors locked, pressing door unlock switch causes room light to illuminate simultaneously with unlocking operation
Security function	Sends signal as rolling code
Transmitter recognition code registration function	Enables 4 modes for registering (writing and storing) transmitter recognition codes in EEPROM, which is built into main body ECU
Self-diagnosis	If system has malfunction, main body ECU sets DTC in its memory