How do you shut off the key-in-ignition chime for a 2004 F150?

There's no single button or setting to disable the key-in-ignition chime on a 2004 Ford F-150. The chime is a safety feature designed to remind you to remove the key. It's tied to the ignition system and not easily bypassed without potentially affecting other electrical systems.

While some vehicles offer options to adjust chime volume or disable certain warnings through the instrument cluster settings, the 2004 F-150 generally does not. Any attempts to disable it using aftermarket devices or modifications could be risky and might void warranties.

The best solution is to simply remove the key from the ignition when you're not driving or starting the truck. That's the intended purpose of the chime.