My lock on the back of blazer will not open with key and the lighter and lights inside don't work done

Place key in ignition hold lock button whilst turning key from off to auxiliary position a few times most cars will bleep when done take key out and use button hopefully solved ps don't start engine ! Good luck

at the bottom of the glovebox there are some 7mm screws remove them and that will give you access to whats inside from the bottom also to open the lock.

Found this wiring diagram for lift gate, if that is what we're talking about? Not only check the fuses, check fuse circuit for voltage. Use a testlite.

The easy way to open the glass without tearing up the tailgate panel or ripping out your carpet:

Pull back the interior tailgate panel right above the bump in the middle where the latch is. There are no screws or bolts in that area, so it should pull away about 2 inches. Then you'll have to reach in and push down the release bar. You should be able to feel for the part that needs to be pushed down to release the glass. Now that it is unlocked, you will be able to open the hatch and the tailgate. Once open, remove the interior tailgate panel, which has one screw on each side.

The failed actuator that needs to be replaced is not all that expensive and can be found at the dealer.

The security light means the computer is not reading the chip in the key.
You should have a sensor in the key lock and a chip on the key programmed for the security system.
I would try a spare key first. If you don't have one, you can get one from the dealer or some locksmiths.
If you know you have a good key, the problem may be with the sensor in the lock cylinder.

Check all the fuses.
But the same fuse works a number of things such as the coutesy lights and an under hood light if equiped. If your interior and any under dash lights work then the fuse is good. You could also have a bad ground or a bad socket. Or even the GPS plug may not fit will in the cigar lighter socket well enough.

did you check for a blown fuse?????

the lock is probably gummed up. you may have to have someone push lightly on the glass while pushing the latch switch to make it move. if not then you can remove the back panel and actuate the latch manually by pulling on the cable. then clean it with brake cleaner and lubricate with graphite.

It took me a few attempts to program a new keyless remote for my 2002 Chevy Blazer.
Insert key into ignition but don' turn it yet. While holding down the UNLOCK switch on the door, the trick is to cycle the ignition ON OFF ON OFF as quickly as possible then release the UNLOCK switch. If done correctly the door locks will cycle 1x to acknowledge. Then hold both the unlock and lock buttons down on the remote for about 15 seconds. The locks should cycle again to confirm...Hope this helps.