System Description

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

WIRELESS DOOR LOCK CONTROL SYSTEM
1. The wireless door lock control system functions to lock and unlock all the doors from a distance. The system is controlled by an intelligent transmitter which sends radio waves to the door control receiver. The multiplex network body ECU performs an ID code identification process and engages the door lock control.

FUNCTION OF MAIN COMPONENTS

Component	Function
Door control transmitter	Has lock, unlock, panic and trunk opener switches. Transmits weak radio waves (recognition codes and function codes) to the door control receiver. Illuminates the indicator light (LED) during transmission.
Door control receiver	Receives weak radio waves (recognition codes and function codes) and outputs them as code data to the multiplex network body ECU.
Front door courtesy light switch Rear door courtesy light switch Luggage compartment door courtesy light switch	Turns on when a door is open and turns off when it is closed. Outputs door status codes (open or closed) to the multiplex network body ECU.
Unlock warning switch	Detects if the key is inserted in the ignition switch or not.
Door lock position switch	Transmits the door lock positions of each door to the multiplex network body ECU.
Wireless door lock buzzer	Emits beep (answer back) when doors are locked or unlocked.
Multiplex network body ECU	Sends wireless door lock control signals in response to the code data from the door control receiver and signals from each switch.

SYSTEM FUNCTION

The door control transmitter has lock, unlock, panic and trunk opener switches. Operating these switches activates each function.

The wireless door lock control system has the following functions:

Function	Operation
All door lock	Pressing the lock switch of the transmitter locks all doors.
All door unlock	Pressing the unlock switch of the transmitter unlocks all doors.
All door unlock (2-step unlock)	Pressing the unlock switch of the transmitter once unlocks the driver's door, and pressing it again within 3 seconds unlocks all the doors.
Panic alarm	Pressing the panic switch of the transmitter for longer than about 0.8 seconds causes the following alarms to activate: Sounds the vehicle horn and security horn. Flashes the hazard warning lights, headlights, and tail lights. Illuminates the room light when the switch is in the DOOR position.
Automatic lock	If none of the doors is opened within 30 seconds after they are unlocked by the wireless door lock control, all the doors will lock again automatically.
Door ajar warning	If any door is open or ajar, pressing the lock switch of the transmitter will cause the wireless door lock buzzer to sound for about 10 seconds.
Illuminated entry	When all the doors are locked, pressing the unlock switch causes the room lights to illuminate simultaneously with the unlock operation.
Repeat	If a door is not locked in response to the locking operation of the transmitter, the body ECU will output a lock signal after 1 second.
Answer back	The hazard warning light flashes once when locking, and flashes twice when unlocking, to signal that the operation has been completed. When the transmitter is used to lock or unlock the doors, this function sounds the wireless door lock buzzer to signal that the operation has been completed.
Trunk opener	Keeping the trunk opener switch of the transmitter pressed for longer than about 0.8 seconds opens the trunk.
Security	Sends an operation signal as a rolling code.
Self-diagnostic mode	The following are ways to enter the self-diagnostic mode. If the door control receiver receives normal radio waves from the door control transmitter when the system is in diagnostic mode, it sounds the wireless door lock buzzer in a normal pattern that corresponds to the function of each switch. Short terminals TC and CG of the DLC3 with the SST check wire. Read DTCs with the Techstream.
Buzzer cancel	The wireless door lock buzzer can be turned ON/OFF by operating the ignition switch or any of the door control transmitter switches.
Transmitter recognition code registration	Enables the registration (writing and storing) of 4 types of transmitter recognition codes in the EEPROM that is contained in the body ECU.

TRANSMITTER RECOGNITION CODE REGISTRATION FUNCTION

The table below shows the 4 ID registration function modes by which up to 4 different codes can be registered. The codes are electronically registered (written and stored) in the EEPROM that is contained in the multiplex network body ECU.

Mode	Function
Add mode	Adds a newly received code while preserving any previously registered codes. The mode is used when adding a new transmitter. If the number of codes exceeds 4, the oldest registered code is erased first.
Rewrite mode	Erases all previously registered codes and registers only newly input codes.
Confirmation mode	Confirms how many codes are currently registered. When adding a new code, this mode is used to check how many codes already exist.
Prohibition mode	Deletes all the registered codes and disables the wireless door lock function. This mode is used when the transmitter is lost.

OPERATION OF INTERLOCK FUNCTION
1. Lock operation is not available when:
  - Any of the doors is open.
  - The key is inserted in the ignition switch.
2. Unlock operation is not available when:
  - The key is inserted in the ignition switch.
3. Trunk opener operation is not available when:
  - The key is inserted in the ignition switch.