13 problems related to headlights have been reported for the 1999 Mercury Grand Marquis. The most recently reported issues are listed below.
Tl - the contact owns a 1999 Mercury Grand Marquis. The contact stated that while driving 65 mph her headlights seized intermittently. The contact stated that the vehicle exhibited the same symptoms as NHTSA campaign number: 15v861000(exterior lighting). The vehicle was not taken to a dealer to be diagnosed or repaired. The manufacturer was notified and provided no information. The failure mileage was approximately 160, 000. Jc.
The contact owns a 1999 Mercury Grand Marquis. While driving approximately 45 mph, the headlights suddenly began to flicker off and on. The vehicle was taken to an independent mechanic who diagnosed that the light control module was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was offered. The local dealer was not notified. The failure mileage was 134,000.
Intake manifold failed (burned and disintegrated in the area of the thermostat ) and had to be replaced at considerable expense . Presently the speedometer fails intermittently dropping to zero at random moments. Most importantly the lights cut out intermittently usually when the heat is on and on longer trips. Also, most times it has happened when it has been raining and colder. Drove upwards of 40 miles with the headlights cutting out intermittently in the rain and cold, problem has continued to recur but seems to be related possibly to having the heat on. I believe the lighting control module is located near a heating outlet and may be suffering a failure as a result but this is just speculation. Also, previously when I had pulled into a rest area for awhile, after cooling down, the problem went away for a little while then resumed after about ten miles with the heat on. I believe it is being caused by the excessive heat the lcm is subjected to by virtue of the area in which it is installed. The lighting control module is of motorola manufacture with siemans relays inside. The part has numerous numbers on it , most prominently: xw7t-13c788-aa , 6mx2794a01, 990429a, and lighting control 95m . Others online with similar vehicles (crown victorias) and of other model years manufactured by Ford have reported similar problems and that replacing the relays has resolved the issue. I do not know that this part is the source of the problem but suspect it as many others online have reported that this part was the source of their problems.
At night while driving headlights and dashboard lights went out on freeway and could not be turned on again. Has happened on two occasions and vehicle cannot be driven and unsafe.
Tl-the contact owns a 1999 Mercury Grand Marquis. The contact stated that while driving approximately 35 mph when the low beam headlight went out. Then they came back on their own. The went out again about a half mile down the road. The next day the vehicle was taken to the dealer and the diagnosis was that the control module was damaged and needed replacement. The manufacturer was notified of the failure. The vehicle was not repaired. The approximate mileage was 133,596. Bp.
The contact owns a 1999 Mercury Grand Marquis. While driving approximately 30 mph, the headlights shut off independently. The headlights re-illuminated after one minute. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was unavailable.
We own three Mercury Grand Marquis, love the cars however all three( 2000, 1999 and second 1999 all intemitantly loose headlights when high beams are on. If I quickly go to low beams I can see again. . . Its like they are overheating with the amp draw of high beams and circuit breaks. This is way too common to be ok. It dangerous especially if one gets rattled with complete darkness at night and high speed. Bumps also seam to slightly affect it sometimes. This happens any time the gray 99 has high beams on for about 45mins. Only 10-15mins on blue 1999 and 2000 not as frequent yet but only has about 75k miles, where as the 1999 are 150-210 respectively. Started 5 years ago on my first and I just did not use high beam since I purchase second 1999 to replace first and had title issues so bought the 3rd 2000 and found they all have the same flaw!! my cell 989-214-0866.
Dt: the headlight covers have lost their protective coating which restricts over half of the light visibility driving in dark conditions or at night. Took to a dealer and service manager said this was an issue with these vehicles for about 3 years before the type of plastic was changed on them. Consumer has not had this replaced.
Headlights failed.
Headlights night vision is very poor on high beam, and low beam is poor ly constructed. Consumer can't tell the difference between high and low beam. Please provide further information.
No summary.
Light from headlights is not bright enough and does not provide enough light on the road. Problem was reported to manufacturer. Ford settlement dispute board stated that problem will have to be resolved. Ford has said that they don't intend to do anything to fix the problem.
Headlights do not produce sufficient light to drive after dark.