I have a 2002 4-Door Blazer with drop tailgate.
When I open the rear glass, the dome lights do not come on (front or rear).
If I pull a door handle, or open any door, both dome lights (front and rear) do come on, so I know the lights work.

Are either of the dome lights supposed to come on when the rear glass is opened?
If so, does anyone know how the rear glass triggers the dome lights to turn on?

In my old '96 blazer, there was a switch mounted right next to the glass latch on the tailgate that turned on the dome lights when the glass was opened.
In my new '02 blazer, there is no switch in that location, nor is there even a hole to mount one.
The hole where the switch was on my '96 is simply a solid piece of metal on my '02.
The '96 also had a switch on the rear dome light itself to enable or disable the rear glass light switch, my '02 does not have a switch on the dome light.
Did GM remove the dome light / rear glass option in the '98+ blazers, or am I just missing something here??

I took apart the rear dropgate and there are no wires or sensors going to the dropgate latches, nor the glass latch.
I don't see any way the truck could tell if the back glass was open or not like the switch on my old '96 did.

Now, there is a switch called the "rear wiper cut out switch", part number 15068307, that gets momentarily bumped by the glass actuator when the button is pressed to open the back glass.
I took the switch apart and found the contacts were burnt, so I cleaned them all up and used a meter to make sure the switch was working correctly, based on it's internal design, afterwards.
The switch has 4 wires going to it, Black is ground, and pink/black is a negative trigger for the dome lights, the other two wires are gray and white, and I believe those have to do with the rear wiper cut off feature.
From looking at the internals of the switch, when it's bumped to a certain position, it's designed to short black and pink/black to turn on the dome lights.
When I press the button to pop the back glass, the actuator bumps the switch momentarily, which in turn shorts black to pink/black and momentarily flashes the dome lights as I expected based on the internals of the switch.
I am so confused about what is going on here......
Why would the switch be designed to flash the dome lights for just a moment?
Maybe that pulse is supposed to trigger the BCM, and the BCM is supposed to keep the dome light on for a period of time, but it's not for some reason??
But that still doesn't make complete sense, because the BCM would have no way to know when the glass is closed to turn it back off.
Maybe I am chasing a ghost here, and this entire rear glass / dome light feature was deleted on 98+ blazers, but then why are there dome light wires going to this switch and pulsing the dome light at all?
SO CONFUSED

 

Edited, still having an issue.

 

Those with a '98+ blazer.. does the dome light come on when you open the back hatch?
Is there a switch that hits the glass to turn it on like the 97 and older blazers have by the latch?

 

Turns out that switch inside the latch does control the dome light, and even though mine seemed okay on the inside, it wasn't working.
Grabbed a few from a scrap yard, works like a charm now.