DIAGNOSIS AND TESTING - POWER TAILGATE SYSTEM

1.

Manual Movement Make sure the tailgate moves manually. Place the ON/OFF Switch located in the glove box area in the OFF position. Move the gate manually and check for proper gate fit and latch effort. Check for interference with other body parts such as latch striker, gate guide bumpers, and weather seals. Correct these problems first. The PTG system works best when the manual operation is smooth and correct.

2.

Battery Voltage Make sure the battery is fully charged. The PTG system is an electronic device and requires a minimum battery voltage to operate. The PTG Control Module (PTGM) monitors the battery voltage present at the PTGM battery input terminal and will not permit operation if the battery voltage is out of range.

3.

Fuses Check to make sure that the fuses are intact. Two fuses protect the battery supply to the PTGM, one for Power, and one for Logic Signals. Power Fuse (30A) is located in the Main Fuse Block in the Engine Room and the Memory Fuse (15A, Shunt Switch) for the logic signal line is located in the fuse box under the steering column.

4.

System Response Spend some time to observe how the system responds to each different input signal upon change in the Central Lock/Unlock status as well as the ON/OFF Switch status. The system may react differently to a certain input such as the RKE or the Master Open/Close Switch than the other inputs such as the Local Open/Close Switch and the Outside Handle Switch. Check also to see if there is only partial trouble with the system such as only power closing is in trouble while power opening function works fine. This kind of observation will help you narrow down the possible root-causes.

5.

Vehicle on Steep Grade or Uneven Surface Make sure the customer has not been operating the PTG system when the vehicle is parked on a steep grade (greater than 20%) or an uneven surface such as with one or more wheels on a curb or in a hole or when the vehicle is raised on a jack. The system may or may not properly operate in those extreme conditions. Also the force of gravity and normal flex of the vehicle body might have damaged the system interface if power operation has ever been tried in such unstable conditions.

6.

Obstacle Detection The obstacle detection force is not adjustable. Factors that may affect the force are vehicle grade, battery voltage, or vertical location of the tailgate. Soft obstacle will increase the effort to reverse the gate. To check the obstacle detection force, simply stand against the tailgate and push it while it is power closing. Obstacle detection force in power opening is usually higher than in closing.

7.	Build Variation The tailgates are not identical. Open and close times and obstacle detection efforts may vary when comparing the vehicles. This is normal and is caused by vehicle build conditions such as body-gate fit, gate hinge balance, and seal force.

8.	Hi-Scan Diagnostic Tools Connect the Hi-Scan tool to the K-line OBD connectors and check the status of the system. Diagnostic Trouble Codes and the Service Data will be useful to diagnose the trouble.

9.	Hi-Scan Tool Software Program (ROM PACK) Update There may be a new update release of the scanner software program that complies with the change of the system or vehicle interface available for you.

The Power Tailgate Control Module (PTGM) controls the Drive Unit Motor, Clutch, and the Power Latch Actuators. The PTGM responds to commands from the external switches such as the Master Open/Close, Local Open/Close, RKE, or from the Outside Handle Switch. It cannot initiate a power open operation without a request from one of the inputs and then only if the vehicle conditions are correct, e.g.: vehicle not moving, unlocked, battery voltage within range, etc. Chime shall operate when a power operation cannot be performed as requested (a one time chime sound). Chime shall operate as well but three consecutive times when an obstacle has been detected or the system could not finish power operation as expected. There is no chime indication related with DTC set.

CONDITION	POSSIBLE CAUSES	CORRECTION
Tailgate does not initiate power open or power close upon switch input, without any indication of Chime	Battery voltage at PTGM is too low (Battery voltage at PTGM input terminal should be higher than 9.0V to start operation, and sustain 8.0V minimum to continue operation)	Check for proper voltage at the PTGM. Charge battery.
	Blown fuse	Check for blown Memory Fuse (a 15A fuse in the fuse box under steering column).
	Bad electrical connection	Check to see if diagnostic communication is possible through Hi-scan tool. - No communication (PTGM does not respond to the Hi-scan request) would indicate that there is electrical connection problem from body wiring to PTGM. Investigate electrical connection of the connectors (including BCM connectors).
	Wiring problems (system or vehicle)	Troubleshoot using electrical schematics. Check electrical continuity of wire harness. Refer to wiring diagrams. Check for switch status with Hi-scan tool.
	Failure of Unlatch Motor	Refer to "Unlatch Motor does not power unlatch without sound indication" section.
	False indication of switches or DTC being set	Check for switch status with Hi-scan tool. Check for diagnostic trouble codes.
	Failure of Anti-Pinch Strip (APS)	Check for APS related diagnostic trouble codes. Check APS connector and wiring.
	Faulty condition generated in body control modules including BCM, DDM and ADM where door Lock/Unlock signal is being processed.	Check BCM and DDM/ADM diagnostic trouble codes for ECU failures.
Tailgate does not power open upon switch input with indication of Chime or Unlatch Motor operating sound	Battery voltage at PTGM is out of operating range (Battery voltage at PTGM input terminal should be higher than 9.0V to start operation, and sustain 8.0V minimum to continue operation)	Check for proper voltage at the PTGM.
	Failure in tailgate unlatch mechanism	Refer to “Unlatch Motor does not power unlatch with sound indication” section.
	Failure in Power Latch	Check latch assembly. Check for foreign matter preventing latch operation.
	Binding or sticking of components	Establish location of binding and replace necessary components
	False indication of switches or PRNDL out of Park with Ignition ON (Park or VSS signal error inhibits power open only when ignition is ON)	Check for switch status with Hi-scan tool.
Power loss during Tailgate operation (No automatic recovery)	Wiring problems (system or vehicle)	Troubleshoot using electrical schematics. Refer to wiring diagrams.
	Battery voltage at PTGM is too low (Battery voltage at PTGM input terminal should be higher than 9.0V to start operation, and sustain 8.0V minimum to continue operation)	Check for proper voltage at the PTGM.
	Failure of Power Tailgate or Body Control Module	Check for diagnostic trouble codes.
	Failure of drive motor	Check for diagnostic trouble codes. Examine and test motor.
RKE or Master Open/Close Switch does not power trigger Tailgate, while Local Open/Close Switch and Outside Handle Switch do (Main ON/OFF=ON)	Failure of Master Open/Close switch assembly	Check for switch status using Hi-scan tool. Check Master Open/Close switch assembly.
	Failure of RKE.	Check RKE battery. Check RKE coding status.
	Wiring problems - vehicle body wiring	Refer to wiring diagrams. Check for switch status using Hi-scan tool.
	Failure of BCM (Body Control Module) or the switch circuit	Troubleshoot using body diagnostic manual.
Unlatch Motor does not power unlatch without sound indication - Latch will not be released from primary position	Failure of Unlatch Motor	Try operating outside handle switch. Examine and test Unlatch Motor.
	Unlatch Motor wiring problem (Unlatch Motor short high or short low)	Check for diagnostic trouble codes.
Unlatch Motor does not power unlatch with sound indication from Tailgate chime or Unlatch Motor - Fail to release latch from primary position	Battery voltage at PTGM is low (Battery voltage at PTGM input terminal should be higher than 9.0V to start operation, and sustain 8.0V minimum to continue operation)	Check for proper voltage at the PTGM.
	Electrical connection problem from outside handle switch	Check for switch status using Hi-scan tool. Check outside handle switch assembly.
	Wiring or electrical connection problems	Check wire connections. Check for diagnostic trouble codes.
	Binding or sticking of components	Establish location of binding and adjust or replace necessary components.
	Failure of Power Latch	Check for diagnostic trouble codes. Check latch assembly.
Tailgate does not stay open	Failure of Gas Strut (One or both Gas Struts have low output force)	Examine gas struts.
Tailgate immediately power closes after a power open to the full open position	Gas Strut cannot hold Tailgate open at full open position causing the PTGM Fail Safe Mode to power close the Tailgate (One or both Gas Struts have low output force)	Examine gas struts.
Tailgate stops power operation in middle of travel	Failure of Optical Sensor	Check for diagnostic trouble codes. Check optical sensor attachment. Reset PTGM.
	Drive Unit failure	Check for diagnostic trouble codes.
Tailgate does not full close to primary latch position - Either reverse or give up cinching after 5 seconds maximum with chime sounding 3 times	Tailgate misalignment	Check latch and striker alignment.
		Check guide bumper alignment.
		Check tailgate hinge alignment.
		Check intervention of trim components.
	Binding or sticking of components	Establish location of binding and adjust or replace necessary components.
	Tailgate seal force too high	Check manual seal force. Check if tailgate can be manually closed from secondary to primary when pushed from outside. Inspect seals for damage, mis-assembly, foreign matter or other possible obstruction.
High manual opening effort	Failure of gas struts	Examine gas struts.
		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 power close	Failure of latch assembly	Check wire connections. Check detent switch status with Hi-scan tool. Replace latch.
		Check for foreign matter.
		Troubleshoot using body diagnostic manual.
	Wiring problems (system or vehicle)	Troubleshoot using electrical schematics. Refer to wiring diagrams.
	ECU or PTG Drive Unit failure	Check for diagnostic trouble code. Reset PTGM.
Tailgate continues to power open (Does not power close when the Tailgate is in full open position)	System lost position information	Manually close tailgate and try power open. Reset and re-initialize the system.
	Wiring problems (system or vehicle) or Latch assembly switch failure	Troubleshoot using electrical schematics. Refer to Wiring Diagrams.
	ECU or PTG Drive Unit failure	Check for diagnostic trouble code. Reset PTGM.
Tailgate will not power open or power close when the Tailgate is in full open position	System is not properly initialized after being open more than 6 hours	Manually close tailgate and try power open. Reset and re-initialize the system.
Tailgate opens very slowly	Battery voltage at PTGM is low (Battery voltage at PTGM input terminal should be higher than 9.0V to start operation, and sustain 8.0V minimum to continue operation)	Check for proper voltage at the PTGM.
	Failure of Gas Strut (One or both Gas Struts have low output force)	Examine gas struts.
	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 drive motor	Check for diagnostic trouble codes. Examine and test motor.
Squeaks, rattles or any other strange noise heard from the drive unit or Power Latch assembly	Foreign material in the drive unit or tailgate	Check and remove foreign material.
	Worn or loose components, or contaminated components in the drive unit assembly (or power latch assembly)	Check and tighten loose components or replace the assembly in case noise does not disappear.
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 latch switch status with Hi-scan tool.

•	Open tailgate and remove D-pillar trim to access the power tailgate motor.

•	Connect a 12 Volt D.C power source to motor wires. If the motor rotates in either direction when the polarity is reversed, the motor is functional.

In case either of the anti-pinch sensors is faulty, “Power Cinching” from the latch as well as the power opening and closing will become disabled and only “Power Unlatching” though the outside handle switch will be functional at this time for maximized safety.

•	Cycle the Power Tailgate through two complete open and close cycles, during each of the final close cycles, with the tailgate in mid-travel, depress each of the pinch sensors to verify that the PTGM detects an obstruction. If it works (tailgate reverses), the pinch sensors and the module are okay.

•

If it does not work, check to see if a pinch sensor error diagnostic trouble code is set using a Hi-scan tool. The next step will be to replace the inoperable pinch sensor assembly. Checking for continuity on the two wires leading from the pinch sensor using an ohmmeter can be an alternative way of diagnosing the trouble prior to replacement.

DTC CODE	DISPLAY
B1101	Battery Voltage High
B1102	Battery Voltage Low
B1105	Reference Voltage Fault
B1223	VSS Fault
B1270	Optical Sensor-1 Output Stuck High
B1271	Optical Sensor-1 Output Stuck Low
B1272	Optical Sensor-2 Output Stuck High
B1273	Optical Sensor-2 Output Stuck Low
B1580	Ignition Start Switch Short High
B1585	Latch Switch Failure
B1586	Chime Open Or Short High
B1587	Chime Short Low
B1621	ECU Defective
B1645	Drive Unit Failure
B2420	Drive Motor Open
B2421	Drive Motor Short High
B2422	Drive Motor Short Low
B2423	Clutch Open Or Short High
B2424	Clutch Short Low
B2425	Left pinch strip open or Stuck High
B2426	Left pinch strip stuck Low
B2427	Right Pinch Strip Open Or Stuck High
B2428	Right Pinch Strip Stuck Low
B2450	Unlatch or Cinch Motor short High
B2451	Unlatch or Cinch Motor short Low
B2452	Cinch motor open

[공백문장]	BCM DISPLAY	UNIT
1	Battery Logic Voltage	Voltages
2	Battery Power Voltage	Voltages
3	Optical Sensor Power	Voltages
4	Gate Optical Sensor 2	LOW/HIGH
5	Gate Optical Sensor 1	LOW/HIGH
6	Detent Switch	LOW/HIGH
7	Forkbolt Primary Switch	LOW/HIGH
8	Power Battery Voltage	OUT OF RANGE/IN RANGE
9	Forkbolt Secondary Switch	LOW/HIGH
10	Right Pinch Strip - Pinch Condition	Not Pinched/Pinched
11	Left Pinch Strip - Pinch Condition	Not Pinched/Pinched
12	Park Switch	Out Of Park/Park
13	Ignition (IG2) Swtich	LOW/HIGH
14	Local Open/Close Switch	Not Pressed/Pressed
15	Master Open/Close Switch	Not Pressed/Pressed
16	Vehicle Speed Slow Status	≥5kph/<5kph
17	On/Off Switch	ON/OFF
18	Ignition "start" switch	LOW/HIGH
19	Gate Open Feedback	Voltages
20	Cinch Feedback	Voltages
21	Cinch relax Feedback	Voltages
22	Gate Close Feedback	Voltages
23	Unlatch Feedback	Voltages
24	Unlatch Return Feedback	Voltages
25	Clutch Feedback	Voltages
26	Most Recent Cinch Time	ms
27	2nd Most Recent Cinch Time	ms
28	3rd Most Recent Cinch Time	ms
29	4th Most Recent Cinch Time	ms
30	Left Pinch Strip Voltage	Voltages
31	Right Pinch Strip Voltage	Voltages