I have the same problem on my 92 LS Trooper. Both of my rear windor
regulators went bad and were replaced. I think the door lock failure
may be linked to the repair job from the window regulator. I decided
to just live with it. It is inconvenient, but most of the time, it is
not important to unlock my back right door. I just leave it locked.
If I need to open it, I unlock and relock it manually.
Both of my rear door locks eventually quit. When I took it into the shop,
they told me Isuzu parts alone would cost about $400, so they sent it to a
guy who put an aftermarket system in there. Locks work great, and it only
I needed them, but if you don't, you might try living with it.
As far as doing it yourself, it depends on if your comfortable taking off
door panels and working with very difficult to reach gizmos. I've done it
before, and it's a real pain in the ass.
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