2005 Mercury Grand Marquis Q&A
2005 Mercury Grand Marquis Question: Headlights not turning on
Every few months the headlights in my car will not go on. They will normally go on automatically at dusk but when this happens I can't even turn them on manually. My high beams won't even work unless I hold it in position. It will take several minutes of me switching them on and off for them to finally turn on. Any idea why this is happening? - heathermary13
First, pull back on your multifunction switch "flash to pass". Does the high beams come on? If so, then the multifunction switch is operational. A scan tool capable of reading body modules must be used to retrieve any diagnostic trouble codes coming from your lighting control module. The lighting control module has been an issue in this model. - Brian Glastetter
My car had 64600 miles on it and the headlights started going out while driving, which can be very dangerous. The problem is in the Light Control Module which is an expensive part (around $500 to $600 + labor). Apparently this is a common problem for this car around this mileage and age (6 yrs old). Ford denies there is any problem. Found 26 complaints about this on another website. People owning this car should be aware of the problem and be prepared for it. Headlights do come back on if you turn the headlight switch back and forth, or stop and let it cool down for a few moments. - bearmug
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i have replaced the headlight switch and i still only have turn signals and hazard lights, no head lights