It's the button for your rear hatch. Push it twice and it'll unlatch your rear hatch.

 

Thanks...I found it out after I started to play around with it.

 

thanks, i'm gonna try that info from the link fat tim provided. the link at the bottom takes you to ebay. they have remotes for 24.95. with instuctions to program it. i'll let you all know how i make out.
thanks again,
joe

 

Thrty5thsc, What did you come up with for reprogramming? I bought remotes for my '96 from E-Bay but can't get the truck to recognize them. I did the 'Hold down unlock and turn key on - off - on - off' thing. Didn't work.....

 

Cool thing about the button is you can shave the rear wiper and button and still pop your hatch with the remote.

 

When I bought my Blazer, the rear key cylinder was gone, so I couldn't open the tailgate or glass. Instead of doing the smart thing and getting a new lock, I just filled the hole in. Thank God for that glass release button inside, lmao.