Probably a sensor ! without hooking up a factory scanner an checking for DTC'S - diagnostic trouble code's couldn't say for sure what the problem is . Your best bet ,take it to a qualified repair shop .
Electronic module involved in the operation of the liftgate .
Object Obstruction Detection
The liftgate control module continuously monitors power liftgate operation and calculates its location and direction of travel using 2 hall effect sensors that are part of the gear motor assembly. The hall effect sensors are 3 wire sensors and are supplied with a 5 volt power circuit, ground and signal circuits from the liftgate control module. The hall effect sensor signal circuits are referenced from battery voltage within the liftgate control module and pulsed low by the hall effect sensors.
The power liftgate system uses a secondary object detection method which consists of object sensors fixed to both sides of the liftgate near the seal area. The object sensors consist of an internal fixed resistor and normally open switch contacts which when closed will bypass the resistor. The signal circuit is supplied 5 volts through a resistor and monitored within the liftgate control module, and during normal power liftgate operation the signal circuit should remain a fixed value. When an object presses one of the sensors the contacts close and the resistor is bypassed causing the signal circuit voltage at the module to go low.
DTC B1019
DTC B1023
DTC B153A
DTC B153B
DTC B153E
DTC B153F
DTC B2494
DTC B2495
DTC B3130
DTC B3135
DTC B3265
DTC B396A
DTC B396B
DTC B396F
DTC B1019
Circuit/System Description
When calibrating the liftgate position, the liftgate module (LGM) is placed in a functional state to learn the liftgate travel limits. DTC B1019 00 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the travel limits are learned by the liftgate module, the LGM will exit calibration mode. If the LGM does not exit learn mode, DTC B1019 00 will remain current and indicate a fault.
Conditions for Running the DTC
SOURCE: Bronco rear window was being rolled up with a key
The electric key switch is next to the key cylinder on the rear door. You can see it easily with the window down and weatherstripping pulled out. The wiring may have become chaffed with the window over the years or the switch corroded in the contact points inside.
SOURCE: tailgate open/ lock latch in closed position so
Annoying, but easy to fix: Actuate the opening handle and manually rotate the latch to the open position.
SOURCE: Auto tailgate warning light is on dash board but tailgate closed.
I have a similar problem, my tailgate stopped working with the outside handle and the remote but can be opened manually from the inside. I don't have an alarm so there is no problem with that but did you get a solution for the tailgate problem that I could try?
SOURCE: Where is tailgate sensor located,
check for proper operation of the tailgate sensor is any where around the tailgate
the tailgate should close all the way if not the message will be there even you change the sensor
SOURCE: TAILGATE OPEN WARNING LIGHT IS ON WHEN TAILGATE IS CLOSED
Sound like your tail gate switch has failed or maybe a fuse
I would take these actions :
1. Check fuses
2. Replace Tailgate switch
3. Take to Auto electrician as it could be a short in your wiring harness.
Hope this helps
(a) Turn the engine switch on (IG).
(b) Halfway open the power window by pressing the power window switch.
(c) Fully pull up the switch until the power window is fully closed and continue to hold the switch for approx. 1 second after the power window is fully closed.
(d) Check that the AUTO UP/DOWN function operates normally.
If the AUTO UP/DOWN function operates normally, reset operations have been completed at this time. If not normal, follow the steps below.
(1) Disconnect the negative battery terminal for 10 seconds.
(2) Connect the battery terminal.
(3) Turn the engine switch on (IG).
(4) Halfway open the power window by pressing the power window switch.
(5) If the AUTO UP/DOWN function operates normally, reset operations have been completed at this time.
If not normal, follow the steps below.
(6) Turn the engine switch on (IG).
(7) Halfway open the power window by pressing the power window switch.
(8) Fully pull up the switch until the power window is fully closed and continue to hold the switch for approx. 12 seconds after the power window is fully closed.
(9) Check that the AUTO UP/DOWN function operates normally.
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