The 2005 Volvo XC90 headlamp removal was simpler then the tail light removal.

These two slide clips were removed.

Notice how they are held in at the top and bottom.

Tip: If these slide clips are difficult to remove, a pair of channel-lock pliers work well to pry on the "L"-shape at the top.

The inboard clip is the shorter one and the outboard is longer.

Using a small flat screwdriver I pried up the red lock clip on the top of the wire connector (red arrow).

The red arrows show the three small bulbs at the bottom of the headlight assembly. To remove these, I just twisted counter clock-wise.

To gain access to the headlamp bulb, I turned the cover and removed it.

To remove the electrical connector, I pried slightly on the end tabs (red arrow) using a small screwdriver. Then I pulled the connector apart.

High Beam:

There was a rubber cap covering the high beam bulb.

American aftermarket light bulb suppliers sell a replacement bulb numbered BP1265H9

I used the small screwdriver to push the spring retainer end (green arrow) down and over.