Lights are stuck ON - Even with new LCM

105

Asked by Jul 13, 2015 at 03:11 PM about the 2003 Mercury Grand Marquis LSE

Question type: Maintenance & Repair

My automatic headlights are stuck on, regardless of the position of the headlight switch,
as long as the key is on.  (They go off when the key is off.)  I've replaced the LCM, and
the turn signal/wiper switch is new.  Should I replace the dash switch?  Where is the light
sensor?  With the red anti-theft light on top of the dash?  Will it need to be replaced, too?  
It's not a big deal, but it's kind of irritating.

5 Answers

50,735

Where did you get the LCM? If it is an after market unit such as Dorman that maybe the problem. The LCM units in these cars have extended warranty from Ford and your's will still be under warranty if the LCM is the problem. The Dorman units are pretty much junk and have been known to cause problems.

105

It's rebuilt; it's the second one. I replaced it as soon as I noticed the lights were stuck. I haven't pushed trying to get a new one from Ford since I replaced the first one years ago.

50,735

They are still under warranty. Something like 250,000 miles and 15 years.

105

263K+ here... I'm getting my money's worth out of this car!

50,735

LOL, You may be able to remove the LCM and resolder the bad solder joints (talking about an LCM that is the same as the original not an aftermarket unit). That is usually what happens to them. Google LCM repair.

Your Answer

Add photo

Related Questions

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,741 nationwide Grand Marquis listings starting at $1,700.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,700
#2 kbro
kbro
Reputation 2,120
#3 Js08016
Js08016
Reputation 1,840
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,234 listings starting at $1,995
Used Lincoln Town Car
45 Great Deals out of 1,793 listings starting at $1,000
Used Chevrolet Impala
573 Great Deals out of 34,619 listings starting at $1,000
Used Chevrolet Tahoe
620 Great Deals out of 36,026 listings starting at $1,800
Used Ford F-150
2,215 Great Deals out of 180,841 listings starting at $1,500
Used Ford Mustang
742 Great Deals out of 42,668 listings starting at $1,300
Used Ford Taurus
259 Great Deals out of 17,916 listings starting at $1,499
Used Cadillac DeVille
1,660 listings starting at $1,995
Used Buick LeSabre
21 Great Deals out of 1,880 listings starting at $1,588
Used Honda Accord
1,002 Great Deals out of 62,552 listings starting at $999

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
3 Great Deals out of 25 listings starting at $5,450
2010 Mercury Grand Marquis For Sale
3 Great Deals out of 80 listings starting at $3,990
2009 Mercury Grand Marquis For Sale
3 Great Deals out of 82 listings starting at $2,900
2008 Mercury Grand Marquis For Sale
9 Great Deals out of 145 listings starting at $2,250
2007 Mercury Grand Marquis For Sale
9 Great Deals out of 117 listings starting at $1,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.