Dash lights don't work when I turn on headlights

Have you made sure that the dimmer is not turned all of the way down?

yes ,
check the fuses.

These are all different circuits. The brake lights are on a 10amp fuse - the headlights are on a 50amp fuse - and the parking and dash lights are on a 20amp fuse.
Do you have power going into the headlight switch and the brake light switch ?

Since these lights will work auto or manual is there a relay that might be bad. You mean these light's won't work auto or manual ????
Did you check the TAIL LAMP LIC LAMP fuse 15 amp . ?
Located in the right I/P fuse panel open passenger door plastic panel end of the I/P pull ,fuse box behind . This fuse takes care of the thing's your having problems with

1st thing to check is to make sure you don't have the dimmer wheel turned off by the main headlight switch to the left of driver.

I assume you checked the bulbs and they were good? It's possible that the sockets have gone bad and need replacing. The tail lights are fused through the instrument panel lights. that fuse should be in the middle of your fuse box, marked "instr". If the fuse is good check to see if the dash lights come on when you turn the headlight switch on. If they don't then change the headlight switch. hope this helps.

try turning the headlight knob left to right several times, and jiggle the switch at night. Also check your fuse panel should be a 10 amp or less fuse that says "Insr" or something like it.

U.S. Focus?

You have at least 4 fuses in the Battery fuse box under the hood to check, plus the ones in the dash panel fuse box. Did you check them all in both places?

the ecm fuse is in the fuse panel and is marked ecm on the fuse panel below the fuse.the fuse panel is under the dash on the drivers side,just use a test light with the key on and check all the fuses remembering the headlight/tail lights must be on and some other circuits need to be turned on.you don`t say why you are looking for the ecm fuse or the year make and model of car.

This is an old post so I don;t even know if you still have the car, but here is what I know.

1) Your radio issue is probably a relay. It is a relay bank located above your glove box. The entire glove box assembly will have to come out. This relay is a little different in appearnace thatn the others as it is skinnier and taller. It is called the Brand Name speakers/radio relay.

2) Your dash readouts are due to a burned out bulb. These are not LED. They are regular 124 bulbs. They've burned out. Banging on the dash probably allowed the filament of in the bulb to touch and temporarily worked.

3) I have a similar problem with the headlights. My headlights turn on manually, but they don't turn on like they are supposed to via automatic photo sensor. When turned on manually, the doors open and the headlights are on. When I manually turn off the headlights, the doors don't close. I've checked everything and I was told it may have something to do with the Body Control Module. I am not completely sure as this research is ongoing.