The problem is a small broken spring inside the door latch assembly. With the broken spring, the door latch will intermittently fail to unlock. Unfortunately, the door latch assembly isn't made to be serviced, even though it's probably a 70 cent spring that fails. This is a terrible failure mode since even unlocking the door manually doesn't work.
The worst case scenario (like mine) is that the door cannot open at all. The exterior handle has no tension, the interior handle doesn't move, and the lock never unlocks. Don't try to force the interior handle, you'll break it off and cause yourself even more problems. After trying to get the door to unlock repeatedly, it finally unlocked for me.
Once the door is open, you need to take the interior door panel off the door and go to work taking the wiring connectors apart. Fortunately, the window track that's in the way comes out after removing one bolt. It's a bit of work to get all of the linkages and rods for the locking mechanisms and the interior door handle apart. After that, you need to get the door latch solenoid out from behind the bracket that holds it. At this point, you should be able to get the latch assembly out.
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On a 1998 Ford Explorer , fuse # 18 , 25 amp , is for the drivers unlock relay , all unlock relay , and all lock relay
pull the forward handle on lower door sill on the drivers side.
if rear side door; unlock and pull handle. if boot lid; pull handle in drivers side door-well (side of the drivers seat) "door open"
On my ( 1995 ) Ford Explorer XLT the power door lock relays ( 3 relays ) are in with the tire jack , behind the removable plastic panel on the drivers side of the cargo area . I assume your 2000 would be the same . There are ( 3 ) relays : - all door lock - all door unlock - drivers door unlock
Does it not have a key lock by the front door handle ( that's what I did on my 1995 Ford Explorer XLT when the battery was dead )
Press the 3/4 button within 5 seconds of unlocking the drivers door with the keypad and all other doors and the liftgate will unlock ( at least that's the way it is on my 1995 Ford Explorer XLT )
You can unlock all the doors , liftgate and glass using the keyless entry keypad , but to actually get the rear glass to open you have to turn the handle on the liftgate Enter your personal code or the factory code to unlock the drivers door and then push the 3/4 button within 5 seconds to unlock the other doors and liftgate
The wiring or the locking mechanism may be damaged in your ford explorer. You need to take it to an auto shop to have diagnostic testing done.
If you are referring to your power door lock on the driver's door, I know that on my 1995 Explorer XLT, in the jack storage compartment there are relays for driver door unlock/all door unlock/all door lock/ and two more relays for interior lamps and trailer park lamps.
where do you find the unlock relay switch on a 98 ford explorer
If you unlock your door using the remote , the courtesy lights come on inside , that's the way it is on my 1995 Ford Explorer ( also , when it is locked and I lift the drivers or front passenger door handle the courtesy lights will come on and then shut off after 20 seconds or so ) - if that is what you are referring to