Buick 2004 Century - Manual (Page 263)

Bulb Replacement
For any bulb changing procedure not listed in this
section, contact your dealer. For the type of bulb, see
Replacement Bulbs on page 5-55.
Halogen Bulbs
{ CAUTION:
Halogen bulbs have pressurized gas inside
and can burst if you drop or scratch the bulb.
You or others could be injured. Be sure to read
and follow the instructions on the bulb
package.
Headlamps
1. Open the hood.
2. Pull up on the headlamp retainers (A) to release the
assembly locator tabs.
5-51