2004 GMC Envoy XUV Midgate will not open - GMC Cars & Trucks

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.

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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.

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

Hello Anonymous,

These system are controlled by an electronic module that should
send a fault code to the BCM (Body Control Module) and accessed via the DLC (Diagnostic/Data Link Connector) if a fault is present.

Some Auto parts stores will connect a OBDII scanner to your vehicle for free and provide you with a starting point should any fault codes be present. Fault code scanning is always the first step in trouble shooting a problem.

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.

there are three things that come to mind, there is the fact that the battery could have died while you were replacing the regulator. ie. left the key in the start position, or there is the possibility that you have some how undone/ loosed a ground wire some where, causing the starter or ignition lock to malfunction. or thirdly there is some kind of "GM safety" feature that would prevent the vehicle from starting while it thinks the gate is open.

check the battery voltage and post a reply. I will keep up with this thread in the meantime.

Duct tape works well.

this is the exploded view of tailgate https://www.gmpartscenter.net/v-2004-gmc-envoy-xuv--sle--4-2l-l6-gas/body--tailgate this is removal and working on an xuv https://www.youtube.com/watch?v=MLQLAD8xOPk

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.

More than likely the throttle body needs cleaning

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....