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Description
Power liftgate is an electro-mechanical system designed to provide power opening and closing of the liftgate through the push of a button of remote key (fob), console switch, inner switch or an outside handle switch of the liftgate.
The power liftgate will reverse direction of travel if resistance to movement is detected while the liftgate is being opened or closed.
Liftgate Position And Direction
The PTG system will measure the liftgate position via an integrated hall sensor inside the Spindle drive unit motor.
The moving direction of liftgate will be detected by analyzing the direction of the drive unit motor.
The hall sensor pulse counting (position detection) is active during power and manual operation mode.
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- PTG Unit PTG unit is located in rear left luggage side trim. PTG drive unit drive the two actuators (Spindles) by measuring the driving motors. PTG unit also controls anti trap functions by hall sensor analysis in the anti-pinch strip.
- PTG Latch Assembly PTG latch assembly is consist of Power Latch (A) and Power Closing Unit (B). Power latch is located in the lower part of tail gate panel.
- PTG Spindle PTG spindle open and close the liftgate by driving the motor.
- Anti-Pinch Strip 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 liftgate is idle in the full closed, full open, or stopped positions.
- SMK (Smart key) Push the power liftgate open of the SMK more than 0.5s to open the power liftgate. Power Open operation shall be reversed when an additional Open/Close signal is received during power opening.
- Interrior Switch
- liftgate inner switch
- liftgate buzzer When a power operation cannot be performed as requested or an obstacle has been detected.
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** - Primary switch signal received by PTGM via CAN bus (sent by SJB)
PTGM Opening procedure
- Opening can be triggered after a signal is received from, driver-console switch, outside handle switch, remote Key (FOB)
- The latch will be released (by SJB) by actuation of latch motor.
- On latch release, the liftgate latch pops out of the striker.
- PTG module controls the liftgate motor in order to open the liftgate.
- The rotating speed of the liftgate motor can be hall sensor that is built in the motor.
- Opening angle of the liftgate is calculated by counting the input pulse signals from Hall sensor. NOTE: When the motor movement is restricted, the PTGM stops the liftgate motor movement due to obstacle detection.
Scheme 24
PTGM Closing procedure
- Closing can be triggered after receiving a signal from, console (driver) switch, outside handle switch, remote key (FOB), inner switch
- PTG module controls the liftgate motor in order to close the liftgate
- Closing angle of the liftgate is calculated by counting the input pulse signals from hall sensor
- The rotating speed of the liftgate motor can be hall sensor that is built in the motor
- The liftgate latch engages with the striker and the latch is locked mechanically (Latch unlock --> Latch lock)
- PTGM stops the liftgate motor operation after detecting the liftgate latch's secondary signal
- On detecting the latch's secondary signal, the power close unit (PCU) starts the contract (cinch) operation and stops after the latch lock signal is detected
- After contract operation is stopped, PCU is rewound until the PCU home position is reached
- The liftgate is completely closed and latch is fully locked
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- Maximum Point for Opening Above this position a start in opening direction could make the liftgate move beyond the Maximum Basic Position and overload the mechanical system (hinges). Therefore the start of an opening action above this point is disabled. Anyway the liftgate moves beyond this point, if it has been started at a lower position.
- Learned Mechanical End Position This is the mechanical block position while opening and is considered to be 100% opening. During the first liftgate opening this position is learned. After learning, the liftgate will not move beyond the Maximum Basic Position, which is defined by the Learned Mechanical Position - Security Distance. All positions are defined by parameters in the ECU or programmed by the user (Basic Programmed Position)
Programming the max. T/gate opening (Garage Position)
- The customizable Programmed Basic Position is set equal to the Maximum Basic Position after the Learned Mechanical End Position is learned. The customer can change the Programmed Basic Position to any new position between the Maximum Point For Closing and the Maximum Basic Position. If the customer wants to set a new Programmed Basic Position below the actual Programmed Basic Position, he has to move the liftgate electrically or manually to the new position and has to push the Inner Switch for e.g. 3 seconds (time can be modified by parameter) If the customer wants to set a new Programmed Basic Position above the actual Programmed Basic Position he has to move the liftgate manually to the new position and has to push the Inner Switch for 5 seconds (time can be modified by parameter) If the user tries to program a liftgate position above the Maximum Basic Position, the ECU will set the Programmed Basic Position to the Maximum Basic Position.
System Parameterization
Due to mechanical tolerances and adjustments in vehicle production and assembly the power operated liftgate needs calibration of the maximum movement range before proper operation can be ensured.
The liftgate's maximum movement range is represented by the number of Hall-pulses received by the ECU from the actuators' speed/position sensors during a liftgate movement from the fully closed position (closure unit in fully latched position) to the upper end position limited by mechanical constraints (e.g. upper bump stops, spindle length or similar).
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System Initialization
System initialization is necessary to identify the liftgate closed (0-Position) position.
After a Battery Power-on reset, an initialization process must be executed to find the full open and full closed liftgate position. After successful initialization for liftgate closed position and learning of the liftgate full open position the normal liftgate open and close operation can be ensured. Procedure
- After Power-on, the Latch status is checked to identify the liftgate position status.
- If the Latch is open, it is assumed that liftgate is open and the inner switch illumination is switched on
- If the Latch is closed, it is assumed that liftgate is closed. Therefore, the liftgate position is set to zero and the initialization is completed.
Buzzer operation is defined in the following chart
| BUZZER | LAMP (1) ) | Remark | |
|---|---|---|---|
| T/gate start | 2 times | 2 times | When T/gate is triggered by Remote Control or T/gate Console Switch |
| T/gate start | N.a. | N.a. | When T/gate is triggered by T/gate Inner Switch or T/gate Outer Handle Switch |
| T/gate stop | N.a. | N.a. | |
| System error | 3 Times | PCU/Tailgate antiplay active, 0ver-/undervoltage condition, End position-/position error, spindle error, CAN error, Latch closed when Tailgate open | |
| T/gate not closed | 10 times | 10 times | Latch Lock Switch not present |
| During Calibration run | Continuous ON-OFF beeping | N.a. | Activate buzzer but not C_PTHazard |
| Max. End Position learned | N.a. | 2 times | Buzzer confirms learning finished |
| Max. End Position deleted | 1 time | N.a. | Buzzer confirms "position deleted" |
| Car is moving with open T/gate | 10 times | N.a. | T/gate open AND Speed >3km/h |
| Garage Position saved | 2 times | N.a. | Buzzer confirms "New Garage Position" |
| (1) Lamp will be synchronized by sending C_PTHazard simultaneously to Buzzer signal | |||
| (1) | Lamp will be synchronized by sending C_PTHazard simultaneously to Buzzer signal |
Diagnosis And Testing - Power liftgate System
The power liftgate system is a complex system containing many components. In order to perform conclusive testing, or receive outputs the power liftgate control module must be checked.
The most reliable, efficient, and accurate means to diagnose the power liftgate system requires the use of a GDS. The GDS can be used to observe current switch status recorded in the power liftgate control module to help the technician diagnose an inoperative switch.
Before any testing of the power liftgate system is attempted, the battery should be fully charged, all power liftgate system inhibitors read and understood (Refer to power liftgate system description for list).
Following are quick reference diagnostic tables to help when diagnosing and testing the power liftgate system.
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| Tailgate opens unexpectedly | Accidental activation or Failure of open/close command switch | Check for shorted or defective switch |
| Failure of latch assembly | Check wiring connections | |
| Check for trouble codes, replace latch if necessary | ||
| Failure of Power Tailgate or Body Control module | Disconnect then reconnect battery or fuse to reset module, function tailgate, if no function exists check for loose wire connections, see Body Diagnostic Manual for detailed procedures | |
| Tailgate will not power open or close | Not in Park or false indication | Check switch status with SCAN tool |
| Battery voltage at PTGM is too low | Check for proper voltage at the PTGM Charge battery | |
| Blown fuse | Check for blown fuse | |
| Gas strut failure | Check condition of tailgate gas struts | |
| BCM or tailgate control module critical fault codes | Check code status with SCAN tool | |
| Failure of latch assembly | Check wire connections and for blown fuse | |
| Check for foreign matter preventing the operation of latch assembly | ||
| Tailgate will not power open or close | Failure of motor assembly | Test motor assembly |
| Binding or sticking of components | Establish location of binding and replace necessary components | |
| Wiring problems (system or vehicle) | Troubleshoot using electrical schematics Refer to the appropriate wiring diagrams | |
| Power loss during Tailgate operation | Wiring problems (system or vehicle) | Troubleshoot using electrical schematics. Refer to the appropriate wiring diagrams |
| Battery voltage at PTGM is too low | Check for proper voltage at the PTGM Charge battery | |
| Failure of Power Tailgate or Body Control Module | Check for diagnostic trouble codes with SCAN tool | |
| Failure of motor assembly | Test motor assembly | |
| No power latching in primary and/or secondary positions | Failure of latch assembly | Check wire connections and for blown fuse |
| Check for diagnostic trouble codes and cycle with SCAN tool | ||
| Troubleshoot using Body Diagnostic Manual. Replace latch assembly, if necessary | ||
| Binding or sticking of components | Establish location of binding and replace necessary components | |
| Failure of Power Tailgate or Body Control Module | Check for diagnostic trouble codes with scan tool | |
| Tail Gate seal force too high | Inspect seals for damage, mis-assembly, foreign matter or other possible obstruction | |
| Failure of motor assembly | Test motor assembly | |
| Latch will not release from primary position | Not in Park or false indication | Check switch status with SCAN tool |
| Battery voltage at PTGM is too low | Check for proper voltage at the PTGM Charge battery | |
| Key fob or overhead console switch does not power operate tailgate | Blown fuse | Check fuse and replace if required |
| Failure of latch assembly | Check switch status with scan tool | |
| Check for foreign matter or damaged components preventing the operation of latch assembly | ||
| Troubleshoot using body diagnostic manual. Replace latch assembly, if necessary | ||
| Failure of outside handle connection | Check handle of brainplate. | |
| Failure of Power Tailgate or Body Control Module | Check for diagnostic trouble codes and cycle with scan tool | |
| Binding or sticking of components | Establish location of binding and replace necessary components | |
| Blown Fuse | Check fuse and replace | |
| Battery voltage at PTGM is too low | Check for proper voltage at the PTGM Charge battery | |
| Does Not Power Unlatch | Failure of latch assembly | Check for foreign matter preventing the operation of latch assembly |
| Check for diagnostic trouble codes and cycle with scan tool | ||
| Check pawl and/or ratchet switch with SCAN tool | ||
| Troubleshoot using body diagnostic manual | ||
| Does Not Power Unlatch | Failure of Power Tailgate Module | Troubleshoot using body diagnostic manual |
| Failure of Body Control Module (BCM) | Troubleshoot using body diagnostic manual | |
| Replace BCM if necessary | ||
| Failure of key fob | Reprogram key fob | |
| Replace key fob if necessary | ||
| Failure of Power Tailgate Module | Check for diagnostic trouble codes with scan tool, see Body Diagnostic Manual for detailed procedures | |
| Failure of tailgate motor assembly | Check for foreign matter preventing the operation of motor assembly | |
| Check wire connections | ||
| Motor clutch does not engage, replace assembly | ||
| Full open switch inoperative, replace switch, if necessary | ||
| Troubleshoot using Body Diagnostic Manual Replace motor, if necessary | ||
| Tailgate does not stay open | Failure of tailgate gas struts | Replace gas struts |
| Check for broken attachments | ||
| High inside/outside opening effort | Failure of tailgate gas spindle | Replace gas spindle |
| Check for broken attachments | ||
| Drive unit jammed or did not disengage | Troubleshoot using Body Diagnostic Manual Replace components, if necessary | |
| Binding or sticking of components | Establish location of binding and replace necessary components | |
| Tailgate continues to cinch closed | Failure of latch assembly | Check wire connections and for blown fuse Check switches with SCAN tool |
| Tail gate continues to power close | Failure of latch assembly | Check wire connections |
| Check for foreign matter | ||
| Troubleshoot using Body Diagnostic Manual | ||
| Control Module | Check for diagnostic trouble codes with Scan tool | |
| Wiring problems (system or vehicle) | Troubleshoot using electrical schematics Refer to the appropriate wiring diagrams | |
| Tailgate continues to power open | Failure of PTGM or BCM | Check for diagnostic trouble codes and cycle, see Body Diagnostic Manual for detailed procedures |
| Failure of motor assembly | Check for continuous drive condition | |
| Wiring problems (system or vehicle) | Troubleshoot using electrical schematics Refer to the appropriate Wiring Diagrams | |
| Tailgate opens very slowly | Battery voltage at PTGM is too low | Check for proper voltage at the PTGM Charge battery |
| Failure of tailgate gas struts | Replace gas struts, if necessary | |
| Binding or sticking of components | Establish location of binding and replace necessary components | |
| Grade of vehicle too steep for power operation | Operate tailgate manually | |
| Failure of tailgate motor assembly | Replace motor assembly, if necessary | |
| Squeaks, Noises and rattles | Foreign material in tail gate compartment | Remove foreign material |
| Worn/Loose components | Check and tighten loose components |
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- Disconnect the negative (-) battery terminal.
- Remove the rear left luggage side trim. Refer to «LUGGAGE SIDE TRIM»(/hyundai/santa-fe/iii-2012-2016/remont/exteriorinterior-trim/#interior-trim) .
- Remove the power liftgate unit connectors after loosening mounting nuts (2EA).
Installation
- Install the power liftgate unit.
- Install the rear left luggage side trim.
- Connect the negative (-) battery terminal.
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- Disconnect the negative (-) battery terminal.
- After loosening the mounting screws, then remove the liftgate trim (A). Refer to «TAIL GATE TRIM»(/hyundai/santa-fe/iii-2012-2016/remont/exterior-body-panels/#tail-gate) .
- Remove the tail gate latch assembly (A) after loosening the mounting bolts.
- Loosen the PCU (Power Closing Unit) mounting nuts.
- Disconnect the power liftgate latch connector (A) and PCU connector (B).
- Remove the power liftgate latch & PCU assembly (A).
- Install the power liftgate latch & PCU assembly.
- Install the liftgate trim.
- Connect the negative (-) battery terminal.
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- Check the power liftgate module input/output value by using the GDS. If the operation of power liftgate module is abnormal, replace power trunk drive unit.
- To check the DTC of the power trunk module, select "PTM"
- Select "Input/output monitoring".
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- Disconnect the negative (-) battery terminal.
- After loosening the mounting screws, then remove the liftgate side trim (A). Refer to «TAIL GATE TRIM»(/hyundai/santa-fe/iii-2012-2016/remont/exterior-body-panels/#tail-gate) .
- Remove the anti-pinch strip sensor connector.
- Remove the anti-pinch strip (A) after removing the clips (5EA).
- Install the liftgate anti-pinch strip.
- Install the liftgate side trim.
- Connect the negative (-) battery terminal.
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- Disconnect the negative (-) battery terminal.
- Remove the liftgate trim and Luggage side trim. Refer to «TAIL GATE TRIM»(/hyundai/santa-fe/iii-2012-2016/remont/exterior-body-panels/#tail-gate) .
- Disconnect the power PTG spindle connector (A).
- Using a screwdriver (A), lift up slightly the socket clips (B) of both ends on the lifter (D), and then remove the PTG spindle from the bracket (C). CAUTION: Take care not to be closed the tail gate, when removing the lift.
- If it is necessary, remove the nuts and replace the PTG spindle bracket (A). Tightening torque: 6.9 ~ 10.8N.m (0.7 ~ 1.1kgf.m, 5.1 ~ 8.0 lb-ft)
- Connect the PTG spindle, bracket and connector. Tightening torque: 6.9 ~ 10.8N.m (0.7 ~ 1.1kgf.m, 5.1 ~ 8.0 lb-ft)
- Install the liftgate trim and Luggage side trim.
- Connect the negative (-) battery terminal.
See also:
• LUGGAGE SIDE TRIM
• TAIL GATE TRIM