2004 CV interceptor. Headlights fail to come on. High beam "flash" functions. Cycling the light switch and the hi-lo stalk has no effect. If I cycle the emergency flasher switch, then the lights come on and function normally.

Year make and model ?
Have you tested the headlight switch ?

sounds as though it may be a column stalk issue if all these functions are on a column stalk it may have become faulty.
It the light switch for main/dip beam is discrete may be a BCM or other electrical fault.
The first is the most likely but, as column stalks may cost a lot of cash, have a competent auto electrician take a look first

yes, it's a complicated circuit, so there are lots of possible reasons. The most likely problem is the DRL relay or the hi-lo/dimmer switch. Since you say the DRLs work, I would check the hi-lo beam switch to see if it has continuity between the tan and yellow wires when set to low beams.

only the high beam circuit goes through the stalk to operate flash to pass function.

i could be the headlamp switch or relay. owner manual will tell you location.
go to motorcraft.com, pro center, tech info, owner manual.

Check to make sure both head lamp bulbs are identical, ie; part numbers. If they look similar but are different numbers that can cause this issue.

Pulling toward you on the stalk only flashes the high beams (spring returns it to low beam position). To switch to high beams, push the stalk away from you.

......No other History, symptoms, clues, things already checked?
Would check the fuses and relay box
Would check the manual (haynes or ?), if separate relay(has contact points that can fail by repeated arc damage like a switch) for high beams, if so could potentially test by switching high relay with low or a test patch wire from battery to the high beam terminal of the relay.
...if not fuses or relays, then potentially the column light/dimmer stalk which is a much bigger pain...
...could also spray some electrical contact cleaner into the column dimmer/light stalk switch and see if any result.
...So, start with the headlights and work back toward the switch---verifying that can get each stage to cause the lights to function by bypassing direct to battery current source.
...hope may have helped

Somehow the tan wire from the low beams has been cut from the hi/lo switch and is now attached to the brown wire from the headlight switch. Trace the tan wire from the headlights to the hi/lo switch to see what happened.

Daytime Running Lamps
The daytime running lamp (DRL) system is designed to turn the high beam headlamps on, with a reduced light output, and without illuminating the high beam indicator lamp in the instrument panel. You have a DRL Module.
The multifunction switch is the stalk on your column.

This is 96 F150 circuit. Don't have 94.


Symptom Chart, Headlamps HEADLAMPS Condition Possible Source Action

• Headlamps Inoperative

• Circuitry open/shorted.
• Damaged headlamp switch.
• Blown fuse.

• GO to Pinpoint Test A .

• Headlamps On Continuously

• Circuitry open/shorted.
• Damaged headlamp switch.

• GO to Pinpoint Test B .

• High Beams or Low Beams Inoperative

• Circuitry open/shorted.
• Damaged multi-function switch.

• GO to Pinpoint Test C .

• One High Beam or One Low Beam Headlamp Inoperative

• Circuitry open/shorted.
• Damaged connector.
• Headlamp bulb damaged.

• GO to Pinpoint Test D .

• Flash-to-Pass Inoperative

• Blown fuse.
• Circuitry open/shorted.
• Damaged multi-function switch.

• GO to Pinpoint Test E .

the regular lo beams have a separate fuse and relay if I remember correctly. Check Fuse 3, 4, 5 and 16 in the your junction block in the passenger side kick panel.