how do you set the auto door lock feature on a 04 ford focus.?

Autolock is an option.

Page 62 and 63 of your manual:

Autolock (if equipped)

The autolock feature will lock the vehicle’s doors when:

• all the doors are closed,

• the ignition is in the 3 (ON) or 4 (START) position,

• you shift into forward or reverse, and

• you release the brake pedal, and

• the vehicle speed is greater than 4 mph (7 km/h).

To deactivate/reactivate the autolock feature using the power door

unlock control

You must complete steps 1-7 within 30 seconds or the procedure will

have to be repeated. If the procedure needs to be repeated, you must

wait 30 seconds.

1. Turn the ignition to the 3 (ON) position.

2. Press the power door unlock control three times.

3. Turn the ignition from 3 (ON) position to the 2 (OFF) position.

4. Press the power door unlock control three times.

5. Turn the ignition back to 3 (ON) position. The horn will chirp.

6. Press the unlock control, then press the lock control. The horn will chirp once if autolock was deactivated or twice (one short and one long chirp) if autolock was activated.

7. Turn the ignition to the 2 (OFF) position. The horn will chirp once to confirm the procedure is complete.

If your car doesn't do this then it isn't equiped with it.

You can get a copy of your manual here:

https://www.fleet.ford.com/maintenance/owners_manu...

Ford Focus Door Lock

reset switch