You can't unless it has a remote trunk popper on the unlock remote. I had the same problem and went to an Isuzu dealer for a new key and remote.
It is really easy. First take off the tailgate and the glass lift hatch. Then you are done.
it took me forever to figer out but i have a 96 rodeo manual and the e brake has to be up and if it don't work id check the fuse panels
How do you replace the tailgate lock on a isuzu wizard 1999
The jack is in the left rear corner. Open the tailgate and remove the cover on the inside panel. The hardware is under the passenger rear seat bottom. Lift the seat forward and it's clipped to the bottom of the seat.
Because the outside handle has lost it's connection with the locking mechanism.
remove the panel from the inside of the rear hatch door and check to make sure the latch mechenism is secure if not push or pull the leads to open hatch door then try to reconnect them
change you thermostat it is stuck open or not closing fully. This allows the coolant to circulate to quickly.
Get someone to hold the hood release lever while you pull up on the hood.
To open the trunk, for a 1993, next to the steering wheel there's a button that says tailgate open, push it. Then go to the back and where the spare is attached to there is a lever on your left that you have to flip towards you, flip it, and at the same time there's another lever right behind that spare you have to pull towards you. that releases the spare away from the door, the window should open and with the spare out of the way you can open the door.
I once had a 1987 that had the same problem! On the inside of the tailgate, at the top ends, there should be a small lever. You can flip them one at a time and it will un latch the tailgate!
On the inside of the tailgate are two bolts. remove them and the taillight will fall out. If you have a bed liner you might have to take it out. On the inside of the tailgate are two bolts. remove them and the taillight will fall out. If you have a bed liner you might have to take it out.
See www.isuzufaq.com entry 41. "How do I reprogram my keyless entry fob?" The first procedure (turn key 3x, close & open door 2x, turn key 5x, close & open door) worked for my 2002 Rodeo.