1999 Mercury Grand Marquis: headlights failing or too dim

Filed Jul 18, 2020 · Lights · 160,000 miles · SC

My headlights, hazards, and turn signals all just randomly went out while driving. They have not come back on since. After reading forums I believe it to be the lcm but my year model is not included in the recall. I believe this issue dates back farther than 2000 and ford should step up and recall more of these lcm components.

Filed Aug 30, 2018 · Lights · 160,000 miles · CA

Tl* the contact owns a 1999 mercury grand marquis. While driving 65 MPH, the headlights failed to operate intermittently. The contact stated that the vehicle exhibited the same symptoms as listed in the federal safety agency campaign number: 15v861000 (exterior lighting). The vehicle was not taken to a dealer to be diagnosed or repaired. The manufacturer was notified and did not assist. The failure mileage was approximately 160,000.

Filed Jun 18, 2018 · Electrical, Lights · 155,000 miles · OH

Vehicle was parked. I went to turn my headlights on. No headlights, turn signals, dash lights, hazard flashers or dome light. The 2003-2005 models were recalled for this same thing with the lcm failing. Please look into this as this is a serious safety issue.

Filed Oct 2, 2017 · Lights · 160,000 miles · MI

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 [xxx]. Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Aug 24, 2017 · Lights · 134,000 miles · OH

Tl* 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.

Filed Apr 12, 2017 · Electrical, Engine · 118,000 miles · TN

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.

Filed Oct 18, 2016 · Electrical, Lights · 100,000 miles · CA

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.

Filed Jan 4, 2016 · Lights · 133,596 miles · MO

Tl* the contact owns a 1999 mercury grand marquis. The contact stated that while driving at approximately 35 MPH, the low beam headlights failed intermittently. The contact mentioned that the headlights would activate and deactivate independently. The vehicle was taken to the dealer where it was diagnosed 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.

Filed Oct 21, 2015 · Lights · 140,000 miles · ME

Tl* the contact owns a 1999 mercury grand marquis. While driving approximately 40-45 MPH, the headlights stopped functioning independently. The failure happened without warning. The vehicle was taken to an independent mechanic who diagnosed that the control module behind the dashboard malfunctioned and needed to be replaced. The vehicle was not repaired due to parts no longer being manufactured. The manufacturer was not made aware of the issue. The approximate failure mileage was 140,000.

Filed Oct 2, 2014 · Lights · MO

Tl* 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.

Filed Mar 15, 2010 · Electrical, Lights · 188,000 miles · NH

Problem: intermittent headlight failure while driving at night with 1999 (1998 year of manufacture) mercury grand marquis. Lights go off for as long as 2-3 seconds and come back on again for a second or two, then go off again, then back on again, etc--and only occurs after the vehicle has been driven for 20-30 minutes. This happened once before, about two years ago, with this very same vehicle and I solved the problem by replacing the headlight switch on the dash. Apparently there is no headlight-related recall* for this particular mercury and the cost to dig deeper into the cause of this problem by the mercury dealership will be therefore at my expense. The cheapest repair cost scenario at the dealership is over $300. This problem should not have occurred under any circumstances in the first instance, not to mention now the second time. *see: nhtsc recall # 99v103 mercury mystique (1998 year of manufacture).

Filed Jul 12, 2005 · Lights · 72,000 miles · OK

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.