The gate opens only halfway what is wrong - 2002 Chevrolet Blazer

The latching delay is an important safety feature on an Elite gate opener, and it is not recommended to defeat it. The purpose of the delay is to ensure that the gate is fully closed and in the correct position before the magnet engages to latch the gate. Disabling the delay could cause the gate to not close properly, which could be a safety hazard and may also damage the gate and the gate opener.
If the magnet is not grabbing the gate on the first impact, there could be several reasons for this. One possible cause is that the magnet is not properly positioned, which could cause it to miss the gate on the first impact. In this case, adjusting the magnet's position may help.
Another possible cause is that the gate is not aligned properly, which could prevent the magnet from making contact with the gate on the first impact. In this case, adjusting the gate's alignment may help.
It is recommended to refer to the owner's manual for your Elite gate opener to learn more about the proper position and alignment of the magnet and the gate.

there is a programmable setting in the control box that does this.you can set the speed to stay the same or speed up once the gates are opening .It is a good thing if you want a fast getaway.Read the instructions book to reset it or leave it as is as this is normal operation mode

Liftgate control moduel uses sensor inputs to control the it , maybe one of these sensors is bad . Having a qualified repair shop hook up a professional type scan tool an check for DTC'S - diagnostic trouble codes in the lift gate control module would be the first place to start

on the shaft that controls the arm or gear for the gate movement there will be 2 cams
open the gate and then loosen of one cam and adjust it off the micro switch until the gate is fully open
lightly tension the screw and then close the gate
repeat the adjusting on the second cam until the gate is fully closed
tension up the screw and then using the remote open the gate when it is fully open leave it or in it is not make small adjustment to get it open
press the remote to close the gate and again adjust to properly close the gate

The control board should have designated terminals to land the protocol sensor wires. What do you have, any wiring diagrams, instructions.
The photocel is probably wired into wrong terminals

You could have dirty photo cells or some obstruction that the photocells are picking up that triggers the safety mechanism to reopen the gate so that no one gets hurt.

Extreme weather conditions (heat and cold) can damage the electronics in the photo cells too.

Are the batteries low on the transmitter?

Typically, photo cells are (or should be) wired to the control board so that it will stop the gate or barrier during the closing cycle should there be a problem- and should fully open again- just like on automatic garage door openers; it's the exact same principal.

I would bet on the liftgate module (LGM) It controls all that stuff back there,wiper,defrost,gate ajar light,gate lock and unlock ect. Might try wiggleing the wiring boot where the wires go from the body to the gate,if it changes anything,bet on a broken wire inside that boot.
If not the LGM is my first thought.

Did you remove the safety clip that stops it from collapsing during installation? Some of these need to be installed compressed and if they extend too far out they will lock up. I would remove the support, compress it at least halfway and then put it back in place with the hatch halfway closed if possible. Then lift the gate and see if that helps in the operation. This assumes you are talking about the spring tension Hydraulic lift bar on the hatch and that you can reach the connecting points with the hatch partially closed.

You should be able to open the window and the gate. If the window won't open while the gate is open, try opening the window first, then opening the gate.

Good Luck!
~Brandon

it may be that the gate has dropped on it's hinges, try lifting as you open. (i assume a side opening gate)