[Previous][Next]
System Description
 
 
SYSTEM DIAGRAM
The automatic back door system performs the automatic open/close operation of the back door by operating the automatic back door switch, automatic back door close switch, automatic back door lock and close switch, back door opener switch, hands free sensor, and keyless operation key.
Automatic back door system controls operation function of the following items.
  • Hands free function (hands free sensor operation)
  • Automatic open/close temporary stop function
  • Back door open position setting function
  • Automatic back door open/close function
  • Warning function
  • Back door auto closure function
  • Anti-pinch function
 
 
HANDS FREE FUNCTION (HANDS FREE SENSOR OPERATION)
The hands free function is a function that automatically opens/closes the back door when the user moves a foot toward rear bumper and then pulls it back quickly (performs a kick motion).
 
 
HANDS FREE SENSOR OPERATION
When the user performs a kick motion toward rear bumper while carrying keyless operation key as shown in the figure, hands free sensor (upper side) detects shin motion of leg and hands free sensor (lower side) detects instep motion of foot. This varies the voltage waveform of hands free sensor. Hands free sensor control unit judges user operation by detecting the voltage change of hands free sensor.
 
 
HANDS FREE SENSOR DETECTION AREA
It is necessary to perform a kick motion within space as shown in the figure for activating the hands free sensor completely. The detection area may differ depending on the conditions of the surroundings.
note
  • For activating the hands free function, a kick motion must be detected by both hands free sensor (upper side) and hands free sensor (lower side).
  • Hands free sensor may not operate in a place near a radio-wave generation source such as a coin-operated parking lot or radio wave tower.
  • Hands free sensor may not operate if shoes that block static electricity (safety shoes, etc.) are worn when operating hands free sensor.
  • Hands free sensor may not operate if there is any metal near rear bumper.
  • Automatic open/close function may operate if hands free sensor detects an animal, rain, an object, etc. when keyless operation key is near the rear bumper.
  • When automatic open function is activated by hands free function, BCM unlocks all doors and activates keyless operation buzzer.
 
 
OPERATION CONDITION
When all of the following conditions are satisfied
  • Vehicle speed: 0 km/h (0 mph)
  • Shift position: P position
  • Power back door setting: ON
  • Keyless operation key: Within keyless operation rear outer antenna detection area
 
 
OPERATION DESCRIPTION (FULLY CLOSED TO FULLY OPEN OF BACK DOOR)
  • When the user moves a foot toward rear bumper and pulls back quickly (performs a kick motion) while carrying keyless operation key, voltage waveform change of hands free sensor (upper side) and hands free sensor (lower side) occurs.
  • Hands free sensor control unit judges user operation by detecting the voltage waveform change of hands free sensor (upper side) and hands free sensor (lower side). The hands free sensor control unit then transmits automatic back door operation request signal to BCM via serial communication.
  • When BCM receives an automatic back door operation request signal from hands free sensor control unit, the BCM transmits a key ID verification request signal to keyless operation key unit via CAN communication.
  • When keyless operation key unit receives a key ID verification request signal, keyless operation key unit activates keyless operation rear outer antenna and checks that keyless operation key is near rear bumper.
  • When keyless operation key is within the keyless operation rear outer antenna detection area, keyless operation key receives the request signal and transmits the key ID signal to keyless operation key unit via remote keyless entry receiver.
  • Keyless operation key unit receives key ID signal and verifies the received key ID with the registered key ID.
  • When key IDs verification match, keyless operation key unit transmits a key ID verification completed signal to automatic back door control unit via CAN communication. When selective unlock function is OFF, BCM unlocks all doors simultaneously. For details of selective unlock function, refer to System Description.
  • When automatic back door control unit receives a key ID verification completed signal from keyless operation key unit, the automatic back door control unit operates back door auto closure function and opens back door.
  • Automatic back door control unit operates the automatic open function after back door auto closure function stops, and opens back door to the full open position* automatically.
    *: Full open position can be changed with back door open position setting function.
 
 
OPERATION DESCRIPTION (FULLY OPEN TO FULLY CLOSED OF BACK DOOR)
  • When the user moves a foot toward rear bumper and pulls back quickly (performs a kick motion) while carrying keyless operation key, voltage waveform change of hands free sensor (upper side) and hands free sensor (lower side) occurs.
  • Hands free sensor control unit judges user operation by detecting the voltage waveform of hands free sensor (upper side) and hands free sensor (lower side). The hands free sensor control unit then transmits an automatic back door operation request signal to BCM via serial communication.
  • When BCM receives an automatic back door operation request signal from hands free sensor control unit, the BCM transmits a key ID verification request signal to keyless operation key unit via CAN communication.
  • When keyless operation key unit receives key ID verification request signal, keyless operation key unit activates keyless operation rear outer antenna and checks that keyless operation key is near rear bumper.
  • When keyless operation key is within the keyless operation rear outer antenna detection area, keyless operation key receives the request signal and transmits the key ID signal to keyless operation key unit via remote keyless entry receiver.
  • Keyless operation key unit receives a key ID signal and verifies it with the registered key ID.
  • When the key IDs match, keyless operation key unit transmits the key ID verification completed signal to automatic back door control unit via CAN communication.
  • When automatic back door control unit receives key ID verification completed signal from keyless operation key unit, the automatic back door control unit operates automatic close function to close back door automatically until back door is in the ajar state (latch and striker are engaged).
  • When automatic back door control unit detects back door ajar state, the unit operates back door auto closure function to close back door completely.
 
 
AUTOMATIC OPEN/CLOSE TEMPORARY STOP FUNCTION
Automatic open/close temporary stop function temporarily stops the open/close operation by operating back door opener switch, automatic back door lock and close switch, automatic back door close switch, automatic back door switch, keyless operation key or hands free sensor during automatic open/close operation.
 
 
EACH SWITCH, KEYLESS OPERATION KEY OR HANDS FREE SENSOR OPERATION
  • Automatic open/close operation stops when back door opener switch, automatic back door lock and close switch, automatic back door close switch, automatic back door switch, keyless operation key or hands free sensor is operated during automatic open/close operation.
  • If the back door opener switch, automatic back door lock and close switch, automatic back door close switch, automatic back door switch, keyless operation key, or hands free sensor is operated during the operation of automatic open/close temporary stop function (back door operation is stopped), the back door direction of operation changes automatically. As a result, the back door operates in the direction opposite to the direction of operation before operation stop.
 
 
BACK DOOR OPEN POSITION SETTING FUNCTION
Back door open position setting function is a function that enables users to set the full opening stop position of automatic open operation when back door may contact an obstacle if fully opened by the automatic open operation.
caution
  • It is not possible to set the position farther than the initial setting fully open position in the open direction.
  • The position of back door cannot be set to approximately 30% or less than full open position. (Opening angle cannot be set to approximately 28° or less.)
  • If a vehicle is parked on a steep slope after setting the fully open position of back door to half open or less, the door may open to near the half open position instead of stopping at the set position.
  • When more than one user uses the vehicle, the back door fully open position setting function may be changed. Be careful when operating automatic open operation for the first time.
 
 
SETTING PROCEDURE
By performing the following operations, stop position of the back door open position setting function can be set.
  1. Set the shift position to P range.
  2. Fully close the back door. (When back door is already fully closed, this operation is not necessary.)
  3. After turning OFF the power back door setting, release the latch by back door opener switch operation.
  4. Manually move the back door to the desired stop position.
  5. While maintaining the back door position, press and hold the automatic back door close switch for 3 seconds or more. When the setting is successfully completed, automatic back door warning buzzer sounds (pattern C).
 
 
RESET PROCEDURE
By performing the following operation, the setting of the back door open position setting function can be canceled.
  1. Set the shift position to P range.
  2. Open the back door to the fully open position.
  3. Manually move the back door to the upper limit position in the opening direction.
  4. Press and hold the automatic back door close switch for 3 seconds or more. When the setting is successfully completed, automatic back door warning buzzer sounds (pattern C).
 
 
BACK DOOR OPEN/CLOSE FUNCTION
Automatic back door open/close function operates auto open/close of back door according to operation of automatic back door switch, automatic back door close switch, back door opener switch, hands free sensor, and keyless operation key.
When push the automatic back door lock and close switch while carrying the keyless operation key, the back door will close, and when fully closed, all doors can be locked.
 
 
OPERATION CONDITION
When all of the following conditions are satisfied.
  • Shift position: P position
  • Vehicle speed: 0 km/h (0 mph)
  • Power supply (automatic back door control unit): Approx. 11 V or more
  • Keyless operation key is with in keyless operation rear outer antenna detection area. (when automatic back door lock and lock and close switch operated)
  • All doors are in unlock status (when automatic back door switch operated)
 
 
AUTOMATIC OPEN/CLOSE OPERATION WHEN EACH SWITCH IS OPERATED
The automatic open/close operation when each switch is operated differs according to the stop position or operating status of back door. Refer to the following.
note
  • When the back door position is in the range of [between "just before fully closed" and the position approximately less than 150 mm (5.91 in) from "just before fully closed"], the back door does not operate even if any of switches are operated. But this is not malfunction.
  • To operate the back door by switches, manually close the back door to "Fully closed" position or manually open the back door approximately more than 150 mm (5.91 in) from the position of "Just before fully closed". And then operate any of switches.
Automatic back door switch
ConditionAutomatic back door switchBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONLong press (0.5 sec)Perform the automatic close function
OFFNon-operation
Fully open to just before fully openStopONLong press (0.5 sec)Perform the automatic close function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
MiddleStopONLong press (0.5 sec)
  • Automatic close operation (Operation before stop: when opening automatically)
  • Automatic open operation (Operation before stop: when closing automatically)
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Just before fully closed to fully closedStopONLong press (0.5 sec)Perform the automatic open function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Full closedStopONLong press (0.5 sec)Perform the automatic open function
OFFNon-operation
Keyless operation key (long press)
ConditionKeyless operation keyBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONLong press (0.5 sec)Perform the automatic close function
OFFNon-operation
Fully open to just before fully openStopONLong press (0.5 sec)Perform the automatic close function
StopOFFPerform the automatic close function
MiddleStopONLong press (0.5 sec)
  • Automatic close operation (Operation before stop: when opening automatically)
  • Automatic open operation (Operation before stop: when closing automatically)
StopOFFNon-operation
Just before fully closed to fully closedStopONLong press (0.5 sec)Perform the automatic open function
StopOFFNon-operation
Full closedStopONLong press (0.5 sec)Perform the automatic open function
OFFNon-operation
Keyless operation key (short press)
ConditionKeyless operation keyBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONShort press (0.1 sec)Non-operation
OFF
Fully open to just before fully openStopONShort press (0.1 sec)Non-operation
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
MiddleStopONShort press (0.1 sec)Non-operation
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Just before fully closed to fully closedStopONShort press (0.1 sec)Non-operation
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Full closedStopONShort press (0.1 sec)Non-operation
OFF
Automatic back door lock and close switch
ConditionAutomatic back door lock and close switchBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONPressPerform the automatic close function
OFFNon-operation
Fully open to just before fully openStopONPressPerform the automatic close function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
MiddleStopONPressPerform the automatic close function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Just before fully closed to fully closedStopONPressNon-operation
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Automatic back door close switch
ConditionAutomatic back door close switchBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONPressPerform the automatic close function
OFFNon-operation
Fully open to just before fully openStopONPressPerform the automatic close function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
MiddleStopONPress
  • Automatic close operation (Operation before stop: when opening automatically)
  • Automatic open operation (Operation before stop: when closing automatically)
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Just before fully closed to fully closedStopONPressPerform the automatic open function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Back door opener switch
ConditionBack door opener switchBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONPressPerform the automatic close function
OFFNon-operation
Fully open to just before fully openStopONPressPerform the automatic close function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
MiddleStopONPress
  • Automatic close operation (Operation before stop: when opening automatically)
  • Automatic open operation (Operation before stop: when closing automatically)
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Just before fully closed to fully closedStopONPressPerform the automatic open function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Full closedStopONPressPerform the automatic open function
OFFPerform the back door auto closure open operation
Hands free function (hands free sensor operation)
ConditionHands free sensorBack door operation
Back door positionBack door conditionPower back door setting
Full openStopONONPerform the automatic close function
OFFNon-operation
Fully open to just before fully openStopONONPerform the automatic close function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
MiddleStopONON
  • Automatic close operation (Operation before stop: when opening automatically)
  • Automatic open operation (Operation before stop: when closing automatically)
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Just before fully closed to fully closedStopONONPerform the automatic open function
Automatic open function operatingStop of the auto operation
Automatic close function operatingStop of the auto operation
StopOFFNon-operation
Full closedStopONONPerform the automatic open function
OFFNon-operation
noteKeyless operation key must be carried for starting the automatic open/close function by hands free sensor operation (hands free function) with the back door stopped.
 
 
TIMING CHART (FULL CLOSED TO FULLY OPEN OPERATION): CASE 1
TimingOperation
Buzzer operate (A pattern) and, back door closure motor starts the open operation.
Open SW turns ON, and back door latch release operation completes.
Half latch SW turns ON, and then back door closure motor performs reverse operation and returns to the neutral position.
When close SW turns OFF, back door closure motor reverse operation stops, and then completes returning to the neutral position.
 
 
TIMING CHART (FULL CLOSED TO FULLY OPEN OPERATION): CASE 2
TimingOperation
Buzzer operate (A pattern) and, back door closure motor starts the open operation.
Half latch SW turns ON, and back door latch release operation completes.
Open SW turns ON, and then back door closure motor performs reverse operation and returns to the neutral position.
When close SW turns OFF, back door closure motor reverse operation stops, and then completes returning to the neutral position.
 
 
TIMING CHART (FULLY OPEN TO FULLY CLOSED OPERATION)
TimingOperation
Buzzer operate (A pattern) and, spindle motor starts the close operation.
 
 
CONTROL IF NOT WITHIN THE OPERATION CONDITIONS DURING THE OPERATION
If the back door is not within the operation conditions during the operation, the automatic back door control unit performs the control as follows.
Item
(Condition)
Back door operation status
Power back door setting: ON→OFFOperation stops
Operation condition release during the operation start announcementAutomatic back door function is not operating
Shift position: P position→other than P position
  • Open operation: Operation stops
  • Close operation: Operation continues (once back door fully closed state is detected, automatic operation does not become available again until the shift position is shifted to P range)
Vehicle speed
[0 km/h (0 mph) → More than 3 km/h (1.8 mph)]
Automatic open function operatingOperation stop [Back door fully closed or buzzer sounds until the vehicle stops (pattern B)]
Automatic close function operatingThe operation is continued [buzzer sounds (pattern B) until back door fully closed]
Malfunction detected
(Power supply circuit, half latch switch, and back door condition)
Operation stops
Touch sensor circuit
(Normal → Open)
Open operationOperation stops
Close operationOperation stops
Closure (close) operationClosure closing operation, or warning buzzer operates (B pattern)
Closure [open (return the latch to the neutral position)]Operation continues
 
 
WARNING FUNCTION
The warning function is as follows and gives the user warning information using automatic back door warning buzzer.
Automatic back door warning buzzer
PatternDescriptionTime
A
Operation start announcement0.75 sec
BPi------••••••The conditions are not satisfied in the fully open position or during the operation, and then the operation continuesBack door fully closed or vehicle is stopped
C
  • Calibration of automatic back door position information is complete
  • Back door open position setting procedure is complete
2.5 sec
D
Anti-pinch operation start announcement0.2 sec
 
 
BACK DOOR AUTO CLOSURE FUNCTION
 
 
OPEN FUNCTION
When back door opener switch is pressed and power back door setting in the OFF position, BCM transmits the back door open request signal to automatic back door control unit via CAN communication, and automatic back door control unit opens back door lock assembly.
 
 
TIMING CHART (OPEN FUNCTION):CASE 1
 
 
TIMING CHART (OPEN FUNCTION):CASE 2
 
 
CLOSURE FUNCTION
When the back door is closed to the half-latch position, the motor drives to rotate the latch lever and pulls it in from half latched to fully latched and automatically closes the door. Then, the closure motor reverses to the neutral position.
 
 
TIMING CHART (CLOSURE FUNCTION)
 
 
ANTI-PINCH FUNCTION
  • When pinching of foreign material is detected during the operation of automatic open/close function, the back door is operated in the reverse direction.
  • The detection methods are the following two types.
  1. Overload detection (detection by encoder)
    • When a drop in the operating speed is detected during the operation of the automatic open/close function, this is judged as pinching, and reverse operation operates.
    • If an overload by pinching or contact with foreign material is detected, reverse operation operates again. At this time, when the second overload is detected, automatic operation stops.
  2. Pinching detection (detection by back door touch sensor)
    If the side part of the door pinches foreign material during the operation of automatic close function, the touch sensor detects this, and the door operates in the reverse direction. If a reverse operation is performed during driving, back door shifts to closing operation again. At this time, if the touch sensor detects foreign material in the closing direction for a second time, automatic operation stops.
  • Automatic operation is stopped when one of the following conditions is detected after the first overload or pinching is detected.
    • Automatic back door switch: ON
    • Keyless operation key back door open button: ON
    • Automatic back door close switch: ON
    • Automatic back door lock and close switch: ON
    • Back door opener switch: ON
    • Hands free sensor: ON
    • Overload detection or pinching detection: second time
 
 
OPERATION CONDITION
Detection methodEncoder pulseTouch sensor
Operation when any trapped foreign material is detectedStop the vehicleBuzzer sounds (pattern D) and reverse operationBuzzer sounds (pattern D) and the back door stops in the fully-open position after reverse operation when automatic close function operating
Running the vehicleNo reverse operation (buzzer sounds, pattern B)Stop of the automatic close function
Number of allowable reverse operationsPerform the automatic open/close temporary stop function after 2 reverse operations regardless of the operation direction