That relay is in the BBEC (body bussed electrical center) which is under the dash to the left of the steering wheel. I do not know how hard it is to get that assembly out to work on the relays. Here is a discussion about it which will be good for the location but not for the relay layout. That year has different relays. I found a discussion of your year and it list the liftgate relay as #1 but had no diagram. Let me know if you cant get to that assembly and we might have to go at this a different way. This would be best however because it makes fast work of eliminating half the possibilities:

https://blazerforum.com/forum/lighti...hematic-81664/


George