On a 2004 envoy, open the hood and on the top of the headlight assy there are two tabs that you pull up allowing you to pull the headlamp assy forward and access the the bulbs. These are halogen bulbs so remember to wear gloves when handling the bulbs.
It goes in from the rear. If you can't get to it you may have to remove the light assy.
The bulbs screw in from the rear and if you can't get to the rear, you have to take the light assy off.
If you can't access the bulbs take the light assy off and turn the bulbs counterclockwise to remove them
in the lamp assy. Mercury switch
Tools required are a 4mm socket to adjust the lamps with the bubble levels located on the headlamp assy.
AnswerHow to replace the headlight (low beam) on a Toyota Corolla 2003? To replace the entire headlamp assy you must remove the bumper cover. There are fasteners across the top, inside fender skirt and along the bottom and also a few clips inside the grill that are accessible from underneath. Three bolts fasten headlamp assy to the radiator support and there are three quick electrical connections.
REMOVE TWO TOP BOLTS ON HEADLAMP ASSY. THEN REMOVE BUMPER COVER, THATS RIGHT THE BUMPER COVER, THEN REMOVE TWO BOTTOM BOLTS
The wheel bearing is part of the hub assy. it the part that the wheel attaches to. If you take your tire off you can see a round piece with 5 suds, that the hub assy. and the bearing is behind it.
The light assy has to be removed and the bulbs removed from the back.
probably water intrusion in your switch assy.
They unscrew from the back of the light assy. You may have to remove the light to get ot it.