Toyota Venza: System Description

Toyota Venza Service Manual / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / System Description

SYSTEM DESCRIPTION

1. WIRELESS DOOR LOCK CONTROL SYSTEM

The wireless door lock control system functions to lock and unlock all the doors from a distance. The system is controlled by a door control transmitter which sends radio waves to the door control receiver. The main body ECU (driver side junction block assembly) performs an ID code identification process and engages the door lock.

2. FUNCTION OF MAIN COMPONENTS

Component	Function
Door control transmitter	Has LOCK, UNLOCK, POWER BACK DOOR* and PANIC 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 main body ECU (driver side junction block assembly).
Front door courtesy switch LH/RH Rear door courtesy switch LH/RH Back door courtesy switch	Turns on when a door is opened and turns off when it is closed. Outputs door status signals (open or closed) to the main body ECU (driver side junction block assembly).
Unlock warning switch	Detects if the key is inserted in the ignition key cylinder or not.
Door unlock detection switch	Transmits the door lock positions of each door to the main body ECU (driver side junction block assembly).
Main body ECU (driver side junction block assembly)	Sends wireless door lock control signals in response to the code data from the door control receiver and signals from each switch.

*: w/ Power Back Door System

3. SYSTEM FUNCTION

The door control transmitter has the LOCK, UNLOCK, POWER BACK DOOR* and PANIC switches. Operating these switches activates each function.

The wireless door lock control system has the following functions:

HINT:

The default settings of the following functions are on. Some of these functions can be customized (See page ).

Function	Operation
All door lock	Pressing the LOCK switch locks all doors.
All door unlock (Unlock 2 operation)	Pressing the UNLOCK switch twice within 3 seconds unlocks all the doors after the driver door is unlocked.
Automatic lock	If none of the doors is opened within 60 seconds after they are unlocked by the wireless door lock control, all the doors will lock again automatically.
Power back door open/close operation*	Pressing the POWER BACK DOOR switch of the transmitter for longer than about 0.8 seconds opens or closes the back door.
Answer back	When the doors are locked by wireless operation, the hazard warning lights flash once and wireless door lock buzzer sounds once. When the doors are unlocked by wireless operation, the hazard warning lights flash twice and wireless door lock buzzer sounds twice.
Panic alarm	Pressing the PANIC switch of the transmitter for longer than about 0.8 seconds causes the following alarms to activate: Sounds the horn. Flashes the headlights, taillights and hazard warning lights. Illuminates the interior lights (when the switch is in the DOOR position). While the panic alarm is operating, pressing any switch of the transmitter cancels the alarm operation.
Door ajar warning	The buzzer sounds when the LOCK switch is pressed when any of the doors are ajar, and it sounds for 10 seconds continuously. The buzzer stops when all doors are closed or the UNLOCK switch is pressed.
Illuminated entry	When all the doors are locked, pressing UNLOCK switch causes the interior lights to come on simultaneously with the unlock operation.
Self-diagnostic mode	The following are conditions 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 flashes the interior lights and sounds the wireless door lock buzzer in a normal pattern that corresponds to the function of each switch. Read DTCs using the Techstream.
Transmitter recognition code registration	Enables the registration (writing and storing) of transmitter recognition codes in the EEPROM that is contained in the door control receiver.

*: w/ Power Back Door System

4. TRANSMITTER RECOGNITION CODE REGISTRATION FUNCTION

The table below shows the 4 ID registration function modes. The codes are electronically registered (written and stored) in the EEPROM that is contained in the door control receiver.

Mode	Function
Add mode	Adds a newly received code while preserving any previously registered codes. This mode is used when adding a new transmitter. If the maximum registration number is exceeded, the oldest one is cleared first.
Rewrite mode	Clears 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.

5. CONDITIONS THAT WIRELESS FUNCTIONS DO NOT OPERATE

(a) Lock function will not operate when either of the following conditions is met:

Any of the doors is open.
The key is inserted in the ignition key cylinder.

(b) Unlock function will not operate when the following condition is met:

The key is inserted in the ignition key cylinder.

Parts Location

PARTS LOCATION ILLUSTRATION ILLUSTRATION ...

System Diagram

SYSTEM DIAGRAM Communication Table Transmitting ECU (Transmitter) Receiving ECU (Receiver) Signal Line Main body ECU (Driver side j ...

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