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their are many problems with any vehicle and envoy/trailblazer[top seller ] have troubles some of the complaints were in the early 02 -03 the sun gear in transmission would crack some were the rear light panel corrosion problem a recall for some 06-07 in the northeastern area for drivers door circuit shorts due to cold weather road salts being able to seep past window and a few not many of the 02 trailblazers /envoys for an air bag module inspection last year recall for some 06-09 for a drivers headlight module the 05 had some for windshield sealant not fully cured their has not really been major problems with them but like with any vehicle the owner will either love them or hate them
once you have removed the headlight assembly and remove the bolt behind the headlight assembly, continue locating the 10mm bolts attaching the fender along the top side, along the bottom in front and behind of the tire, open the drivers side front door, look into the opening between the door hinges and with a flashlight and a long extension on your ratchet you will then remove the two bolts between the fender and door, one on top and one at the bottom. you also have to remove the retaining bolts that attach the inner fender liner to the fender.
On the inside trim,
you can remove screws (these screws may be covered by filler pieces or
may be visible, or they may require you pry a plastic piece off that
covers the screws) that are by the door handle,
arm rest, under door and side of door and then gently pull back on the
panel as there will also be retaining clips attached and you don't want
to break them. You'll need to lift the door panel upwards in order to
get it off the window ledge. Then you'll need to manipulate the panel
and disconnect the door handle linkage from the door handle and disconnect any other wiring that may be attached to the door.
The pass. side door switch seems to have a loose connection on the multi harness connector to the window/lock/seat controls. Or this vehicle is equipt with a door module that does not fail all at once. They will work intermittantly as does yours until they just fail to work. This module HAS to be installed by an authorized dealer so that they may code it to your security settings.
There are two fuse boxes on this vehicle. On the side of the dash and under the hood. Open the drivers door and on the side of the dash board (where the door would meet it) there is a panel that removes. Under the hood the fuse block is on the drivers side under a plastic cover. It will have a picture of a battery on it. Press in on the two tabs and remove the cover.