Lights are stuck ON - Even with new LCM

75

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

40,345

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.

75

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.

40,345

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

75

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

40,345

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 2,196 nationwide Grand Marquis listings starting at $1,995.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,180
#2 kbro
kbro
Reputation 2,040
#3 Js08016
Js08016
Reputation 1,620
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,220 listings starting at $1,700
Used Lincoln Town Car
30 Great Deals out of 2,080 listings starting at $1,995
Used Chevrolet Impala
796 Great Deals out of 34,383 listings starting at $799
Used Mercury Marauder
35 listings starting at $7,998
Used Honda Accord
811 Great Deals out of 81,609 listings starting at $899
Used Chevrolet Tahoe
778 Great Deals out of 28,448 listings starting at $1,500
Used Ford Taurus
256 Great Deals out of 20,485 listings starting at $1,500
Used Ford F-150
2,702 Great Deals out of 211,804 listings starting at $1,000
Used Cadillac DeVille
6 Great Deals out of 1,954 listings starting at $1,750
Used Ford Mustang
364 Great Deals out of 44,400 listings starting at $1,000
Used Lincoln Continental
3,714 listings starting at $42,294
Used Toyota Camry
1,103 Great Deals out of 96,275 listings starting at $1,250

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
33 listings starting at $3,900
2010 Mercury Grand Marquis For Sale
5 Great Deals out of 112 listings starting at $2,999
2009 Mercury Grand Marquis For Sale
3 Great Deals out of 108 listings starting at $2,998
2008 Mercury Grand Marquis For Sale
8 Great Deals out of 175 listings starting at $2,995
2007 Mercury Grand Marquis For Sale
4 Great Deals out of 160 listings starting at $2,400