Rear hatch on my 2002 chevy tracker wont open the key will lock the door but wont unlock it how can i fix it?

Key fob or hatch lever near the symbol on the hatch door. You didn't indicate a particular problem but here are some videos that address a variety of situations:

2007 Chevy Uplander - Fix and Maintain those Power Sliding Doors (youtube.com)

2007 Chev Uplander Door Lock Repair - Doors won't Lock (youtube.com)

This Is CLE (youtube.com)

SOLVED: Chevy uplander rear liftgate will not unlock - 2005 Chevrolet Uplander ' Fixya

Yes, you should be able to use the key to unlock the rear hatch of your 2009 Equinox even if the car battery is dead. The lock cylinder for the rear hatch is likely located on the outside of the hatch itself, or it may be located on the door handle. To unlock the hatch with the key, insert the key into the lock cylinder and turn it clockwise. If the key won't turn or the hatch won't open, you may need to wiggle the key or apply more pressure to unlock the hatch. If the key won't go into the lock cylinder at all, it is possible that the lock is frozen or damaged and will need to be repaired or replaced. You may also be able to use the manual release for the rear hatch, which is usually located inside the vehicle, near the driver's side door or on the underside of the dashboard.

Rear hatch is locked or unlocked with a key. (if equipped) • To open the rear hatch, insert the key into the lock, turn it to the unlock position and pull up the rear hatch by pressing the handle (DOOR). You can also lock/unlock the latch (but not release it) with the central door lock system. • If unlocked, the rear hatch can be opened by pressing the handle (DOOR) and pulling the hatch up. • To close the rear hatch, lower and push down the rear hatch firmly. Make sure that the rear hatch is securely latched.

rear door hatch lock repair GMC Chevrolet - YouTube

? 4:26
https://www.youtube.com/watch?v=QS3PMhGgyAg
Apr 5, 2014 - Uploaded by auto resource
2002 Yukon, rear hatch lock not locking. ... rear door hatch lock repair GMC Chevrolet. auto resource ... chevy tahoe lift gate notopening - Duration: 2:12. ... A Method how to unlock your car in 10 seconds :) - Duration: 0:35.

chevy tahoe lift gate not opening - YouTube

? 2:12
https://www.youtube.com/watch?v=xU6ybiY3F4I
Sep 1, 2010 - Uploaded by 76bluemoon
Back lift gate/glass would not open or release. Even when unlocked with the key fob or the unlock switch on the drivers/passenger door. ... How To Install Replace Rear Lift Gate handle 2002-09 GMC Envoy Chevy Trailblazer ...

you'd better call a mechanic in your place.

I have had the same issue with mine. Using the key unlock the door from the outside while at the same time lifting the handle underneath. You may have to bang on the cover of the lock to get it to unlatch as well. Once opened you will find the back cover comes off fairly easily however getting to the lock set can be a challenge. Look at the rod assembly and make sure it is not bent. Mine was bent and out of alignment. I had to get another because it was too weak.

Remove the inner rear hatch skin, and operate the hatch manually to release it.
Test the locking mechanism again, and check for power.

There is a manual release on the inside of the hatch door.
Somewhere in the center of the door under an oval cover plate you can open it with a screwdriver.

I found this URL on internet http://www.chefseattle.com/blog/site-news/suburban-rear-liftgate-wont-unlock-how-to-fix/ It might fix your problem.

the unlock or popper for the door needs to be replaced. the door should work with a key.