Chevrolet 2005 Uplander Owner's Manual page 358

To replace one of these bulbs, do the following:
1. Open the hood. See Hood Release on page 5-11
for more information.
2. Remove the headlamp retainer pin (A) by turning
it towards the headlamp assembly and pulling it
straight out.
5-46
3. Remove the screw (B) from the top of the headlamp
assembly.
4. Pull the assembly away from the vehicle.
5. Disconnect the socket wiring harness connector
from the headlamp assembly.
6. Turn the bulb socket counterclockwise to remove
from the assembly.
7. To replace a headlamp bulb, disconnect the
bulb socket wiring harness and connect to the
new bulb socket.
To replace a sidemarker bulb, pull the old bulb out
and push a new bulb in.
8. Reinstall the bulb socket by inserting into the bulb
assembly and turning it clockwise to secure.
9. Reverse the steps to reinstall the headlamp
assembly.