I found this for an S80 2001:

The front bumper has to be partially removed on one side to replace a headlight assembly or glass.

Start by removing the upper clips that retain the glass to the headlamp shell.
Next, drill off the 4 plastic-headed rivets inside the wheel well (have new rivets and a rivet gun handy for re-installation).
Remove the headlight wiper arm, the black plastic bumper trim cover just below the headlight (just pull off carefully), and the side marker lamp (which is attached to the black cover). The plastic parts are easier to remove if you heat them first with a hair dryer or heat gun to make the plastic more soft and pliable.
Remove the turn signal lamp assembly (push down on the release tab from the top next to the headlight, then slide forward).
Remove the 2 plug covers in the lower front area of the bumper, and remove the bumper retaining bolts. The bumper will now slide forward enough to remove the remaining clips that retain the glass to the shell.
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This is how to get the lense off:

http://volvospeed.com/volvo_repairs_how_tos/resetting_service_lighting/s60r_v70r_headlight_lens.html

Klaus



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Always willing to listen, just not able to take direction.