DOOR / HATCH: POWER BACK DOOR SYSTEM: SYSTEM DESCRIPTION (2008 Sequoia)

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 the 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 memory.

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

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

Then, the power back door ECU controls the back door opening/closing operation by outputting commands to the back door lock and back door drive 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 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 system causes a warning buzzer to sound when the shift lever is moved to any position except P when the power back door starts operating or while the power back door is operating (the buzzer continues sounding).

(7) The power back door system turns OFF when the shift lever is moved to any position except P while the power back door is opening.

The power back door continues to close when the shift lever is moved to any position except P while the power back door is closing.

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

(9) 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).

(10) 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.

(11) The power back door system slows the back door 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:

Function

Condition

Back door buzzer

When the pressing back door control switch and the transmitter switch, the warning buzzer sounds while switch is pressed.
When power back door closer switch is pressed, the warning buzzer sounds for 1 second.
Warning buzzer sounds intermittently while the power back door is operating.
Sounds once for 0.1 sec. to notify that the power back door will reverse moving direction after being triggered by switch operation or activation of the jam protection function.
When back door handle switch is pressed while the power back door is operating, the warning buzzer sounds for 2 seconds.

Hazard lights

Flashes twice to notify that the power back door will start operating when a request is input from the switch while the back door is fully closed/open.

Power back door main switch

Power back door system does not operate when switch is in ON position.
Power back door system operates when the switch is OFF.

Transmitter switch

Pressing the switch causes the power back door to open/close.
Pressing it again during operation reverses the direction of movement.

Back door control switch

Transmitter a power back door OPEN/CLOSE signal to the power back door ECU via main body ECU.

Power back door closer switch

Transmits a power back door CLOSE signal to the power back door ECU.