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Vertical or frame rolling indicates adjustment of the frame hold is required or perhaps there is a synchronisation fault.
Breaking of the picture in the horizontal plane is caused by the line hold requiring adjustment though the symptom can be connected with interior or exterior signal problems or perhaps a power supply fault, especially where both the line and frame are affected together.
It is probably a task for an engineer or at least someone with access to the servicing instructions.
you could adjust the vertical and horizontal adjustment through the main menu of the monitor. buttons on front of monitor. auto adjust may fix it but if it does not look for the vertical or horizontal adjustment fot the area effected. if this helps please rate with comment
VERTICAL AIM ADJUSTMENT
1. Park the vehicle on a level surface approximately 7.6 meters (25 feet)
from a vertical wall or screen directly in front of it.
2. Measure the height from the
center of your headlamp to the
ground and mark a 2.4 meter (8
foot) horizontal reference line on
the vertical wall or screen at this
height (a piece of masking tape
works well). The center of the lamp
is marked by a 3.0 mm circle on the
3. Turn on the low beam headlamps to illuminate the wall or screen and
open the hood.
4. On the wall or screen you will
observe a light pattern with a
distinct horizontal edge of high
intensity light with a slight angle
towards the right. If this edge is not
at the horizontal reference line, the
beam will need to be adjusted.
5. Locate the vertical adjuster on
each headlamp, then use a 4 mm
socket/wrench to turn the adjuster
either counterclockwise (to adjust
down) or clockwise (to adjust up)
aligning the upper edge of the light
pattern up to the horizontal line
6. HORIZONTAL AIM IS NOT
REQUIRED FOR THIS VEHICLE
AND IS NON-ADJUSTABLE.
on each headlamp assembly, there will be either one or two plastic nuts that you can turn.
If you only have one nut on each, that will adjust the vertical aim of the headlights.
If you have two nuts on each, one will adjust the vertical and the other will adjust the horizontal.
your car on a level ground 30 feet from a wall and measure the height
from the ground to the bulb and mark on a wall (do this for highs beams
and low beams if the bulbs are separate, if highs and lows are the same
bulb, only do it for the lows)
If the headlights read VOR, then
aim the brightest part or cutoff part just below the mark on the wall.
If it says VOL or nothing, aim them 2 inches below the mark on the wall.
You said that you took it in to the gmc dealer Take the vehicle back and have them show you where the adjustera are in the service drive an advisor can show you how . and then if the headlight is not set in there are not push into the wholes the retainers from the headllights sit in.and yes their are 2 screws torx in general and one is on one side and the other is on the other side of the light the other may below the sight shield. Please rate my response