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You can get a diagram for the driver door lock mechanism for a 2001 Isuzu Rodeo at various auto part stores. You can also check in the owner's manual.
Look under the drives side door. It is a small canistor protected by a heat shield. It is about the size of a soup can.
under the driver's door to your right.
hammer and sledge
It's located on the inside of the fuse door panel.
You can not open the rear hatch door from the inside.
Its in the headliner above the rear door. The cover on it pops right off.
does it have a door ajar switch. if it does, may be stuck or faulty. there is no door jar switch
If it is the same as a 1996 it will be top row second from the front in the fuse box by drivers door.
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.
There is a plastic cover inside the rear door jamb along side the tailight assembly. This cover snaps off and back on but take care not to break it as it does take some effort to remove.
Because the outside handle has lost it's connection with the locking mechanism.