Inside will be the back of the bulb and the wire harness. Rotate the back of the bulb assembly and it should come out. Disconnect the wires and replace it, and put it back the same way you took it out.
Reference this thread
http://www.coremazda.com/forums/mazda6-forum/792-Mazda-6-headlights.HTML
With the help of my brother, I was able to replace the driver side low beam to my 2006 Mazda 6. Above helped a ton but one additional piece of info was missing. There is a spring load on the bulb. After you remove the cap, you need to get a light in there and see the loop which is holding in the bulb. That has to be pressed down and pushed to the side to release the spring and then the bulb can be removed. The bulb I had to turn slightly and then it came right out. Take it out slowly so you can see how the replacement will go back in. The base of the replacment bulb had a flat side so I just kept track of where that was when I removed it. Don't touch the actual bulb...I was told that if you get the oils of your fingers on it, the light will burn out within a week because the oils bake on and cause it to burn out.
Be careful when removing the bulb. It can easily break and leave fragments inside the lens assembly. The wire spring is holding the bottom side of the light and when twisting the light to relieve the pressure on the bottom side, the bulb can break (which mine did).
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How do you replace headlight bulb on 2004 Mazda Tribute?
beat the car with a bat
For the 1994 model (B3000), you can't change just the bulb. You have to change the headlight assembly.
newtest3
You will need to take the complete headlight assembly loose or out to get to the bulb to change it.
what year? and which parking light? side marker or in the headlight? 2005 Mazda 6 side marker light bulb
Look at it and you will figure it out.
Replace headlight bulb only when blown.
1999-2000 Mazda Miata headlight bulb replacementIts a Halogen bulb so you dont replace the whole headlight assembly, just the bulb.From engine compartment, unplug the bulb connector on bad bulbRemove the rubber ring covering the area by pulling on the tabs.Remove the bulb by depressing the spring clip and swinging it out, similar to a safety pin.Remove the halagon bulb, careful not to touch the surface of the new bulb with your fingers.Replace in reverse order.
Push the spring towards the headlight and slide it downward gently. You should be able to remove the bulb.
I did it few months back, under the Hood, when you check your headlight there is a metal ring like lock just unlock by pulling it easily, remove the rubber cover and pull out head light bulb.. done. Replace the bulb, and replace the same way.
On older vehicles you replace the entire headlight. On the newer vehicles you just replace the bulb unless the headlight assembly is damaged.