Lighting Control Module

[lamont76]

Hello all, So i'm thinking my LCM has had it's last day. In the day time the taillights and side markers work just fine. At night all of a sudden the taillights, fogs, and side markers come on for 3-5 seconds then I literally hear a click and all three go out. Seemed like it noticed it was dark and shut down. Is this the indication that the LCM is bad?

[silversnake]

Yes.. that sounds about right. I just replaced mines a few weeks ago because the headlights would randomly turn off while driving then back on after a min or so


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[fastblackmerc]

OP - I can repair your LCM. PM me.

[GoldPanther]

Does this happens with the car on?

[the fat bastid]

A relay in the module goes bad. Got to open it up, desolder it, solder in a new one.
A relay is a switch which may be the click you hear.

Not only does fastblackmerc fix them, he was nice enough to go over the steps here http://mercurymarauder.net/forums/showthread.php?t=45131

[RF Overlord]

@ the OP: you say the taillights, the side markers and the fogs all go out together...what about the headlights? The LCM issue *usually* affects just the low beams. Also, the fog lamps don't even go through the LCM at all. They're a direct wire from the fog lamp relay.

[Turbov6Bryan]

Lots of rain?

Wires in the wiper motor are wet , corroded too

Sounds like wet contacts causing the headlights to turn on and off with the twilight sensor

My 03 would turn the head lights at night without the head light switch in the auto selection

If you have a cloudy day, mine did it until I R/R the LCM then the wiper motor and harness fixed it

[fastblackmerc]

Let me explain what I repair in the LCM...........

The factory relays are 10A units. The first relay to go is usually the headlight relay because there is more than 10A going thru it. I replace that relay with an external 30A or 40A relay which is easily replaced if it goes bad.

The other 3 relays inside are for all the other lights. I replace them with 20A relays.

I also guaranty my work for as long as the vehicle is running.

[GetMeMyStogie]

@ the OP: you say the taillights, the side markers and the fogs all go out together...what about the headlights? The LCM issue *usually* affects just the low beams. Also, the fog lamps don't even go through the LCM at all. They're a direct wire from the fog lamp relay.



There are four identical relays in the LCM, any of which can fail. I replaced the one for the headlights a few years ago, the one for tails/fogs just a few weeks ago.
Your assertion that the foglight circuit doesn't include the LCM is incorrect. There's a foglight 'on' relay in the LCM, and a foglight 'bypass' relay in the battery box, iirc.

[BLACKMARAUDER04]

Recall on this.
Have dealer replace it for free.

[RF Overlord]

Stogie is correct...I missed a section of the wiring diagram. There is a control line from the LCM that goes to a fog light cutoff relay, which is separate from the fog light power relay. The wiring diagram shows both being in the BJB, but the owner's manual only shows the power relay there...

[TJCOX]

Hello all, So i'm thinking my LCM has had it's last day. In the day time the taillights and side markers work just fine. At night all of a sudden the taillights, fogs, and side markers come on for 3-5 seconds then I literally hear a click and all three go out. Seemed like it noticed it was dark and shut down. Is this the indication that the LCM is bad?

30MAY14


RECALL NOTICE: A 14N01 LIGHTING MODULE
CAUSE: E
14N01C RECALL

8932 WF94
1 4W7Z*13C788*BC PROCESSOR - LIGHTING CONTROL


FC: PART #: COUNT:
CLAIM TYPE: 14N01C
AUTH CODE:
008932 TOTAL N/C

[TJCOX]

Does this happens with the car on?

This happened to me while driving at night, while my daughter was following us, when she
called my wife on her cell phone to inform us about the no taillights. Needless to say I used
my four way flasher all the way home for about 90 miles.

[fastblackmerc]

Recall on this.
Have dealer replace it for free.


30MAY14


RECALL NOTICE: A 14N01 LIGHTING MODULE
CAUSE: E
14N01C RECALL

8932 WF94
1 4W7Z*13C788*BC PROCESSOR - LIGHTING CONTROL


FC: PART #: COUNT:
CLAIM TYPE: 14N01C
AUTH CODE:
008932 TOTAL N/C

I bet any dealer you call won't have one.

[TJCOX]

I bet any dealer you call won't have one.

You may be surprised as my dealer had one. (Pearson Ford) If not they can order one.

[the fat bastid]

I bet any dealer you call won't have one.
^
"Ford will send you a letter when the parts arrive."
STILL WAITING.

[Turbov6Bryan]

The dealer do have them.

Tell em your headlights shut off at night and they will swap it out for free

Or have fbm replace the relays,done