Midgate closed window up dash says midgate ajar. Its fully closed

It is possible that the battery change may have disrupted the electrical system of your GMC Envoy XUV and caused a problem with the trunk latch mechanism. Here are a few things you can try to resolve the issue:

1. Check the fuse: The trunk release mechanism may be controlled by a fuse. Check the fuse box and replace any blown fuses.
2. Check the trunk release button: Make sure the trunk release button inside the vehicle is working properly. If it doesn't work, try resetting the power to the vehicle by disconnecting the battery for a few minutes and then reconnecting it.
3. Check the trunk lock mechanism: Inspect the trunk lock mechanism to see if there is any visible damage or debris that may be preventing it from unlocking.
4. Check the trunk latch mechanism: Sometimes the trunk latch mechanism can become stuck or jammed. Try lubricating it with a penetrating oil to see if that helps.
5. Try the key: If your GMC Envoy XUV has a keyed trunk release, try using the key to open the trunk.

If none of these steps resolve the issue, you may need to take your vehicle to a professional mechanic for further diagnostics and repairs.

Relay maybe .Doesn't look like a relay is involved for window . Looking at a wiring diagram an using a volt meter to test electrical circuit would be the way to find the problem . Do you know how to test automotive electrical circuits ? How to read a wiring diagram ?
Midgate Components
The midgate consists of the following components:
• Midgate window switch
• Midgate latch release switch
• Midgate window regulator
• Left midgate latch
• Right midgate latch
• Midgate latch relay
• Midgate 25-amp window regulator circuit breaker
• Midgate 15-amp latch relay circuit breaker

Midgate Window Control
The midgate window is controlled by the following:
• Midgate window switch
• Midgate 25-amp window regulator circuit breaker

Reading a little more from service repair manual i do see a relay , it's part of the window motor assembly . Could possibly be the window regulator . You need to take midgate panel off an look inside . Test electric to the motor while in then .
Midgate Window Operation
When the midgate window switch is activated to Up, battery voltage is supplied to the coil of the midgate window up relay in the window motor, energizing the relay. When the window up relay is energized, the window is driven in the Up direction.
When the midgate window switch is activated to Down, battery voltage is supplied to the coil of the midgate window down relay in the window motor, energizing the relay. When the window down relay is energized, the window is driven in the Down direction.

xTooltipElement
Service Information
2004 GMC Truck Envoy - 2WD ' Bravada, Envoy, Rainier, TrailBlazer (VIN S/T) Service Manual ' Body ' Body Rear End ' Repair Instructions ' Document ID: 1252579
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Midgate Window Regulator Replacement
Removal Procedure
Remove the midgate inner panel. Refer to Midgate Inner Panel Replacement .
Remove the midgate window. Refer to Midgate Window Replacement .
Disconnect the midgate window regulator electrical connector (1).
Remove the midgate window position switch (2) from the window regulator. Refer to Midgate Window Position Switch Replacement .
Remove the nuts retaining the window regulator to the midgate.
Remove the regulator from the midgate.
Installation Procedure
Install the regulator to the midgate.
Notice: Refer to Fastener Notice in the Preface section.
Install the nuts retaining the window regulator to the midgate.
Tighten
Tighten the window regulator nuts to 25 N·m (18 lb ft).
Install the midgate window position switch (2) to the window regulator. Refer to Midgate Window Position Switch Replacement .
Connect the window regulator electrical connector (1).
Install the midgate window. Refer to Midgate Window Replacement .
Check and adjust the midgate window alignment to the weatherstrip channel. Refer to Midgate Window Replacement .
Install the midgate inner panel. Refer to Midgate Inner Panel Replacement .
© 2019 General Motors Corporation. All rights reserved.

The window indexing feature is used to lower the driver and passenger power windows approximately 4 mm when the door is opened. This is necessary to allow the top edge of the window to clear the window weather-strip. This feature will also raise the window to the fully seated position once the door is closed.
Is just the driver door not working ?
Observe the operation of the driver window and front passenger window while opening and closing their respective doors. The windows should index DOWN and UP when the doors are opened and closed.
? If either window does not index UP or DOWN, refer to Window Index Feature Malfunction.

Window Index Feature Malfunction
Ignition ON, observe the scan tool Driver Door Ajar Sw and Door Ajar Switch parameters while opening and closing the driver and passenger doors, the parameter should change from Door Closed to Door Ajar.
? If the parameter does not change when opening and closing the doors, refer to Door Ajar Indicator Malfunction .
Ignition OFF, disconnect the harness connector at the appropriate window motor.
Ignition ON, with the door closed, test for greater than 10 volts between the signal circuit terminal 5 and ground.
? If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
With the door open, test for less than 1 volt between the signal circuit terminal 5 and ground.
? If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
If all circuits test normal, replace the window motor.

Your best bet mite be to take your vehicle to a qualified repair shop (GM dealer )

Folloow the link to find instruction on replacing the window regulator for the midgate http://forums.trailvoy.com/showthread.php?t=90533

This may be as simple as relearning the window stop positions. Perform the following procedure to relearn the windows;

1) Sit in the drivers seat and ensure both doors are fully closed.
2) Turn the key to the ON position but do not start the vehicle.
3) Pull up on the drivers window switch until the window reaches the full up position, then CONTINUE HOLDING THE SWITCH UP for 2-5 seconds, then release the switch.
4) Push down on the drivers window switch until the window fully opens, then CONTINUE HOLDING THE SWITCH DOWN for 2-5 seconds, then release the switch.
5) Repeat steps 1-4 for the passenger window.
6) Close both windows and check the operation of the smart glass.

Let me know if you need further help.

Nate

I’m happy to assist further over the phone at https://www.6ya.com/expert/nathan_cc888cf971f43e78

I assume you have an XUV. Same thing happened to me a few months back. If the glass isn't broken ( and you would have heard it if it did), its the "midgate window regulator" that has failed. I recently installed one myself and it's not terribly difficult [couple of hours x 2 nights by myself - easier with another pair of hands] if you are somewhat mechanically inclined and have a basic tool set. Here's a start on finding the part: https://www.google.com/#q=envoy%20xuv%20midgate%20regulator Google : "envoy xuv midgate regulator installation" and you'll be able to see a few examples.

Duct tape works well.

The same thing happened to my '04 XUV. Discovered broken white nylon/plastic that retains the end of the lift cable. Ordered a new lift gate motor/mechanism assembly ($250) online and replaced it myself. Be sure to buy a new limit switch ($13) also. I did not and regretted it because you must remove the old limit switch from the old motor assembly so you can re-assemble it to the new motor assembly. While removing the old switch from the old assembly, I broke it. Had to then order a new switch. The cost to ship the switch separately was more than the switch. The whole thing did not really take that long and was surprisingly easy. It works great now.

the plastic part of the window regulator has broken I think on that year the motor and regulator come as a one piece replacement unit and are fairly easy to install,if you remove the inner panel you should be able to see the broken piece when you try to cycle the window.Good luck

take inside door skin off, everything now a days is plastic, prob the arm to lift window or a plastic gear broke, really easy to do....