Trunk / Liftgate: Description and Operation

Description

Power tailgate is an electro-mechanical system designed to provide power opening and closing of a vehicle's tailgate through the push of a button of the transmitter key or tailgate outside handle or the master switch or local switch.
The power tailgate will reverse direction of travel if resistance to movement is detected while the tailgate is being closed. If resistance to movement is detected while the power tailgate is being opened, the tailgate will stop moving.
1. PTG DRIVE UNIT
Power tailgate drive unit consists of a DC motor, optical sensor, clutch, push rod, rack and wire harness.
PTG drive unit is located in rear left on D-pillar panel.




A. Optical sensor : Provides tailgate velocity and position information
B. Clutch : Transmit motor power to push rod through pinion gear.
2. POWER LATCH
Power latch is located in the lower part of tailgate panel. When tailgate reaches latching position, cinching motor (A) will cinch the tailgate electrically. And unlatch motor (B) unlatch the latch electrically when receive the open signal.




3. ANTI PINCH STRIP (C)
During power closing or cinching, the PTG system shall reverse to full open if an anti-pinch strip signal is received. However, the anti-pinch strips will not work when the Tailgate is idle in the mid-position.




4. PTG CHIME (D)
When a power operation cannot be performed as requested or an obstacle has been detected.




5. REMOTE KEYLESS ENTRY (A)




Push the power tailgate button (A) of the remote keyless entry more than 0.5s to open the power tailgate. Power Open operation shall be reversed when an additional Open/Close signal is received during power opening.
6. OPERATING ORDER
Switch ON -> clutch on -> motor operation -> pinion gear rotation -> rack rectilinear motion -> push rod motion -> tailgate open/close

Operation

Power Tailgate Open/Close
1. The power tailgate will open and close automatically if the master switch (A) is pressed more than 0.5s on the lower crash pad.




2. When the power tailgate starts operation from full closed or full open position, the warning lamp and the chime will operate 3 times.
3. General rules for chime functions
A. Chime & tail lamp shall operate prior to and during power opening or closing the Tailgate : 3 Times (0.5 sec on, 0.5 sec off), after 1 chime start opening or closing with two chimes.
B. Chime shall operate when a power operation cannot be performed as requested except handle pull : 1 Time (Duration 0.5 second on)
C. Chime shall operate when an obstacle has been detected : 3 Times (0.5 sec on, 0.5 sec off)
D. Chime shall operate if PTG has not reached primary latch position after a power cinch cycle : 3 Times (0.5 sec on, 0.5 sec off)

Power Tailgate Operating Condition
1. The tailgate will not power open when vehicle is moving above 3 mph (5 km/h) or the gearshift lever is not in P (Park).
2. The power tailgate only will open with the transmitter when doors are central locked and armed.
3. If the power tailgate detects an obstacle, it would either stop or move to the full open position to allow the object to be cleared.
4. The PTG system is an electronic device and requires a minimum battery voltage to operate. The Electronic Control Unit (ECU) monitors the battery voltage at the ECU input terminal and will not permit operation if the battery voltage is out of range.
5. If the PTG button is pressed during closing operation, the power tailgate may reverse direction and open fully.
6. Remove the accumulated snow or ice on the power tailgate before operating.

NOTE:
- To prevent the battery from being discharged, do not leave the power tailgate at open position for a long time.
- The PTGM will go to a sleep mode and power operation will be disabled if the tailgate is left open longer than 6 hours.
Manually close the tailgate to the latched position to reset the PTGM. Power operation will be restored.

WARNING:
- Always disconnect the negative battery cable before attempting any power tailgate system service.
- Never attempt to enter or exit the vehicle with the tailgate in motion. You could be injured or cause damage to the power tailgate system and / or components.

Power Operation
The PTG system shall not open the Tailgate when the vehicle is moving.
The PTG system shall operate through the full range of Tailgate travel.
The PTG system shall learn the position of each travel extreme: full open and full closed.




1. Vehicle condition
Moving
A. (IGN=OFF and Vehicle Speed > 5 km/h) or (IGN= ON and (Vehicle Speed > 5 km/h or TRANS - not P))
Not moving
A. (IGN=OFF and Vehicle Speed ≤ 5 km/h) or (IGN= ON and (Vehicle Speed ≤ 5 km/h and TRANS - P))
2. TAILGATE TRAVEL ZONES
The Tailgate travel is divided into four zones starting at the full closed and latched position. Dimensions are at the bottom edge of the Tailgate and are approximate.
Zone 1 : Power Latching - from primary to secondary latch (0 to 10 mm depending on latch travel).
Zone 2 : Between Secondary and Crossover Point (Secondary to 20 degrees)
Zone 3 : Between Crossover Point and Power Off (20 degrees to 79 degrees)
Zone 4 : Power Off to Full Open - approximately 5° (15 counts from full open)