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If you look in your owners manual there are step by step instructions on how to properly change the headlight bulbs in your truck.
There could be many reasons, but the first thing I would check is ARE BOTH HEADLIGHT STILL WORKING. As a tech I was once faked out till I found out there were 2 burned out headlights. Not always visibly dark bulbs.
Assuming you mean 2008 Cadillac DTS (not data), see sources and related links below.
Nicole
To change a headlight on a 1999 Acura TL open the hood and locate the bulbs which are plugged into the housings. Loosen the bulbs and pull them off. Replace them.
Before replacing the headlight bulbs on a 1997 Acura CL prop the hood open. Locate the headlight housing and remove the old bulbs. Install the new lights.
The headlight assembly (aka the headlight bucket) is removable by releasing the lock tabs behind the assembly. Once the assembly is wiggled out in the open you can easily replace the bulbs.
LIFT THE CLIPS AND PULL IT OUT
You need three Polocks!
The headlight on a 1985 Honda Civic is changed by lifted the hood open. Locate the housings for each headlight and find the harnesses for the bulbs. Pull out the old bulbs and replace them.
You will have to remove the front bumper cover and grill to access the headlight assembly. I paid about $100 to have it done at the dealer.Type your answer here...
To change headlight bulbs in a 2005 Ford Escape, first make sure the light switch is in off position and replace the passenger light bulb. Next, get to the driver's side bulb, remove the battery by holding it down, to be able to change the headlight bulb.