How do you replace lamps of a 2005 Saturn Ion?

To replace the lamps in a 2005 Saturn Ion, first, ensure the vehicle is turned off and the keys are removed. For headlight replacement, open the hood, disconnect the electrical connector from the back of the headlight assembly, and remove the retaining ring or clip. Replace the old bulb with a new one, being careful not to touch the glass, then reassemble everything. For taillight bulbs, open the trunk, remove the access panel, and twist the bulb socket to replace the bulb.