The endgate uses an electrical latch system. The latch system contains 3 separate electrical latches that are located on the upper left corner, upper right corner, and lower left corner of the endgate. The latches latch when battery voltage is removed. The latches will unlatch, or release when battery voltage is applied. The latches work in conjunction with a dual pivoting hinge located on the lower right corner of the endgate to allow the endgate to swing open from the left to right for access and cargo loading, or to drop to extend cargo space.
Do you know what diagnostic trouble code's are ? An electronic control module controls the unlocking of the tail gate an when problems like not opening happen ,DTC'S set in the endgate module ,pointing to the problem . Need sophisticated diagnostic tool to check it .
DTC B3745
The endgate control module supplies voltage for the endgate latch relay coil control circuit to the endgate latch relay. This output is used to energize the endgate latch relay when an endgate swing latch or drop latch request has been made. If the endgate module detects an open or short to ground on the endgate latch relay coil control circuit when a swing latch or drop latch request is made, a DTC is set.
Remove the endgate latch relay.
Connect a test lamp between the endgate latch relay coil control circuit of the endgate latch relay connector and a good ground.
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, command the endgate module to swing endgate.
Does the test lamp illuminate?
DTC B3967
The endgate module monitors the lower left endgate latch actuator and upper right endgate latch actuator circuits. When the endgate module detects an open or short to ground on the lower left endgate latch actuator and upper right endgate latch actuator circuits, a DTC is set.
You could try replacing the endgate latch relay . Do you know what a relay is ? Video's on youtube showing how they work an how to test . The only thing is , the relay is inside the endgate ,need to take trim panel off .Video's on youtube for that too , probably .
SOURCE: 2004 GMC Envoy XUV mid-gate window won't roll up
be sure the gate is fully closed or it will not roll up if it is firmly in place and still does not go up you will have to remove the cover and see if the actuator plastic has broken off from the switch, it also could be a bent rod and or the switch is bad. Check fuses as well just to be sure before going to all the other work to pull cover off. Hope this is helpful and thanks for using Fix-ya.
SOURCE: 2004 GMC Envoy XUV tailgate won't open downward
Do you live in a dusty area? My sister lives in dusty New Mexico and had a malfunctioning XUV tailgate. My reasoning was that something must tell the tailgate not to drop down if the glass is up, and if it can't tell, then it will only open sideways.
So we removed the trim panel, and the tailgate was indeed full of dust. By reaching my arm in, I found two plastic optical sensors which tell the gate whether the glass is up or down; both were coated with dust. After cleaning these the tailgate was back to its normal operation. The two sensors are flat, round - about the size of a nickel or dime...I couldn't see them, just found them by guessing that they must be there. Hope this helps!
SOURCE: tailgate will not open at all, i can unlock the
do you have the tailgate with the window in the upper half and does the window open?
SOURCE: Back door will not open from the side.
both my back doors will not open from inside or outside of my 2004 gmc envoy xuvwhat can I do?
SOURCE: How to open the tailgate door manual in a 2004 gmc envoy xuv
from inside --on the back panel will see round plug remove and use a long screw driver and light push down on release
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