Toyota Venza: System Description

Toyota Venza Service Manual / Door / Hatch / Power Back Door System / System Description

SYSTEM DESCRIPTION

1. POWER BACK DOOR SYSTEM DESCRIPTION

(a) The power back door system controls the power back door by automatically opening and closing the power back door with a motor.

(1) The power back door system operates only when the necessary conditions are satisfied.

(2) The power back door ECU records the back door positions in the power back door ECU.

If the battery, power back door fuse, power back door ECU or back door motor unit is removed and then reinstalled, the power back door ECU loses the memory of the door positions.

In such cases, initialization of the power back door system is necessary. Refer to the Initialization (See page ).

(3) "OPEN/CLOSE" request signals for the back door are received by the power back door ECU.

Then, the power back door ECU controls the back door opening/closing operation by sending commands to the back door lock assembly and back door motor unit.

(4) The power back door system has various request signals: "OPEN/CLOSE" request signal from the transmitter switch, "OPEN/CLOSE" request signal from the power back door control switch, "CLOSE" request signal from the power back door closer switch, and "OFF" request signal from the back door main switch.

(5) The power back door system sets off an alarm (using a buzzer) and hazard warning lights when the power back door starts operating.

(6) The power back door reverses the direction that the power back door is operating if any switch is pressed during operation.

(7) A pulse sensor and a touch sensor are used to prevent anything from being caught in the door while the power back door is closing (jam protection function).

(8) The power back door system stops motor operation and switches to the manual operation mode when the jam protection function is activated repeatedly more than the specified number of times.

(9) The power back door system slows the back door down when the back door approaches the fully opened position or fully closed position in order to reduce the impact against the vehicle body.

(b) Function of main components:

Component	Function
Power back door warning buzzer	Sounds for 0.8 seconds when the power back door closer switch, power back door control switch or transmitter switch is pressed. Sounds intermittently while the power back door is operating*. Sounds twice for 0.1 seconds to notify that the direction of door movement will reverse after being triggered by activation of the jam protection function. Sounds for 2 seconds when the back door opener switch assembly is pressed while the power back door is operating.
Hazard warning lights	Flash twice to notify that the power back door will start operating when an OPEN/CLOSE request signal is input from a switch while the back door is in the closed or fully open position.
Power back door main switch	The power back door system does not operate when the switch is on. The power back door system operates when the switch is off.
Transmitter switch	Pressing the switch causes the power back door to open/close. Pressing the switch again during operation reverses the direction of door movement.
Power back door control switch	Transmits a power back door OPEN/CLOSE request signal to the power back door ECU via the main body ECU (driver side junction block assembly).
Power back door closer switch	Transmits a power back door CLOSE signal to the power back door ECU.

*: Default setting is off.

Precaution

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System Diagram

SYSTEM DIAGRAM Communication Table Sender Receiver Signal Line Main body ECU (Driver side junction block assembly) Power back ...

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