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Lincoln Forum: 2002 LSE Electrical Problem
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  1. #1
    Join Date
    May 2017
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    2002 LSE Electrical Problem

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    Gentlemen ... I'm hoping beyond hope that the collective wisdom here can assist with what I've been told by the dealer is an "unsolvable problem". After spending a week at one of the largest dealers in my area and racking up an $1,200.00 bill, the Service Director suggested my best bet was to sell the car for parts

    A little background. I've had my 2002 LSE (V8) for 3 years and it just surpassed the 100,000 mile mark. Other then standard maintenance, replacing spark plug coil packs and valve cover gaskets it has been problem free and a great car.

    The Problem While going down the road recently, all of the sudden the drivers door ajar chime came on for no reason and will not go off (when this happened the power locks unlocked, interior lights come on, there is no power to the locks, windows or sun roof and the key fob does not work). I did the simple thing suggested here and elsewhere (lubricated the latch mechanism) but to no avail. I took it to my usual local repair shop who indicated he was not equipped to diagnose and reluctantly referred me to the dealer. The dealer did the following in attempt to resolve the problem:

    1. Tested and replaced the driver door lock switch (no help)
    2. Checked the driver's door wiring harness for shorts, grounds, etc. (nothing)
    3. Reprogrammed the driver's door control module (no dice)
    4. Replaced the DDCM (no change)
    5. Contacted Lincoln for assistance who said they had never seen the issue but ran the problem by their engineers who of course ... came up empty.

    My questions to the brain trust hear at the forum is simple. Has anyone seen this issue before, and If so, what is the fix? I am tired of driving with earplugs and shutter at the idea of selling the car for parts

  2. #2
    Slick Fan's Avatar
    Slick Fan is offline Senior Member My Lincoln(s): 2003 TC Signature, 1977 TC, 2003 Aviator
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    That's an odd problem, for sure. I don't own an LS, so I can't directly relate, however I do have a couple '03 Lincolns.

    A while back, my Aviator would randomly turn on the interior lights & show a door ajar message. The only way to turn off the interior lights is to turn the dash dimmer switch all the way down to off. If I didn't do that, the lights would stay on all night & potentially drain the battery. I could lock the doors on the door pad (not the key fob), but the alarm wouldn't arm.

    I ended up narrowing the problem down to the door ajar switch in the rear gate. You didn't mention checking or replacing that switch in your car, so you may give that a shot.
    It's really odd that it also cuts the power to your windows & sunroof!

    Anyway, I hope that helps.

  3. #3
    Join Date
    May 2017
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    Hello Slick and thank you for the response. When I asked if one of the other door (or trunk) sensors could be at fault, the electronics specialist at the dealership said based on his testing that would not be possible (they all seem to work fine). Additionally, the interior lights do not stay on after I turn remove the key and exit the vehicle.

  4. #4
    Physics_Outlaw is offline Junior Member My Lincoln(s): 2006 Lincoln LS V8
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    Apr 2017
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    Northern Virginia
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    JBuck, sorry to hear about this. I have never experienced this problem before but I can tell you what I would do to start troubleshooting. I would check all the fuses for the items that do not work. Sometimes you can tell if they are on the same circuit this way. I would then obtain the schematics from a repair manual to double check their correlation. I would then check the switch that opens/closes at the forward location on the door that tells the computer if the door is open or not and whether to turn on the interior lights. I recommend disconnecting the battery, removing that switch, and using the multimeter to test its resistance. If the dealer already did this, I apologize but didn't see that the door switch was addressed rather they replaced the door lock switch instead.

  5. #5
    Join Date
    May 2017
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    Quote Originally Posted by Physics_Outlaw View Post
    JBuck, sorry to hear about this. I have never experienced this problem before but I can tell you what I would do to start troubleshooting. I would check all the fuses for the items that do not work. Sometimes you can tell if they are on the same circuit this way. I would then obtain the schematics from a repair manual to double check their correlation. I would then check the switch that opens/closes at the forward location on the door that tells the computer if the door is open or not and whether to turn on the interior lights. I recommend disconnecting the battery, removing that switch, and using the multimeter to test its resistance. If the dealer already did this, I apologize but didn't see that the door switch was addressed rather they replaced the door lock switch instead.
    Hello P_Outlaw and thank you for weighing in. Regarding the fuses ... all are fine. Regarding a "forward location switch", I don't see one and the schematics indicate that the only "door ajar" switch is the one associated with the latch assembly.

  6. #6
    Join Date
    May 2017
    Posts
    4

    Talking Problem solved

    Gentlemen ... Just a final update for anyone interested in the resolution of this problem. In a final act of desperation I consulted the owner of a repair shop in a nearby town (35 years experience with all of the state-of-the-art diagnostic tools. I had enjoyed his weekly auto repair radio show for some time). He convinced me that unlike the dealer, his people would be able to find and fix the problem. The good news is that in less then a day they were indeed able to do so on time and within what I considered a very reasonable quote. It turned out to be a problem with a loose common ground that affected both the airbag module and driver door module. Once the ground was fixed, everything immediately came back on line. The earplugs are now back where they belong ... In my range bag

  7. #7
    Slick Fan's Avatar
    Slick Fan is offline Senior Member My Lincoln(s): 2003 TC Signature, 1977 TC, 2003 Aviator
    Join Date
    Jan 2014
    Location
    Utah
    Posts
    328
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    Ahh, the elusive grounding problem! Why didn't I think of that? That's great that your repair shop was able to find the cause & get you fixed up.

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