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Security alarm, auto unlock, parking lights, door ajar, oh my!


Weekend

New Member
Joined
March 22, 2013
Messages
12
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City, State
Cincinnati
Year, Model & Trim Level
2002 Explorer XLT 4x4
The first thing I noticed was a door ajar signal while I was driving... sometimes a stutter of locking as if the car was just placed into drive and the auto locks were engaging. The next thing I noticed was the alarm going off every now and then... and now it's consistent -- almost every night and/or in the parking lot when I am shopping.

To me all of those pointed to a bad door ajar light... but recently I've seen two new behaviors that have me stumped:

1) If I take the key out of the ignition, open the door, and then press lock... the doors automatically unlock again as if the explorer thinks the keys are still in the ignition
2) If I have auto headlamps turned on, I notice my parking lights cycling on and off

Should I keep troubleshooting the door ajar switch, or does this sound like some kind of control module going bonkers?
 


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Luke G.

New Member
Joined
November 7, 2016
Messages
20
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City, State
Murray, KY
Year, Model & Trim Level
2002 Explorer 4.0
I had the same exact problem with my 2002 Explorer. I troubleshooted which door ajar switch was faulty. 8/10 times its the driver side door. For the new behaviors, it sounds like its related to the door ajar switch.
 




LMHmedchem

Active Member
Joined
October 28, 2011
Messages
270
Reaction score
1
Year, Model & Trim Level
2002 Explorer XLT v8
Should I keep troubleshooting the door ajar switch, or does this sound like some kind of control module going bonkers?
I always start with anything I know needs to be fixed. You know the door ajar switch is a problem, so fix that since you know you need to do that anyway and see if it helps with anything else.

There are lots of things that are affected by broken wires in the door boot, so that is somewhere else to look if fixing the switch doesn't clear up the rest.

LMHmedchem
 




toypaseo

Flunked daycare
Elite Explorer
Joined
January 3, 2003
Messages
7,214
Reaction score
448
City, State
outside shovelling snow
Year, Model & Trim Level
................ 96 XLT ™
Unsure if it is the same deal as in my 96, but I had issues with the factory alarm going off at random times. I replaced the battery under the hood, and that solved my problem.
 




WildBill798

New Member
Joined
November 19, 2016
Messages
2
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City, State
Elizabethton Tn.
Year, Model & Trim Level
2002 Ford ExplorerXLT
My '02 is also having some of the same issues, door chimes, door locks etc. Sometimes just barely touching the brake pedal seems to do it. But when I get about a half mile down the road, it never does it again. ... unless I stop and turn it off.
 




Lauri salow

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Joined
January 22, 2017
Messages
8
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City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
My '02 is also having some of the same issues, door chimes, door locks etc. Sometimes just barely touching the brake pedal seems to do it. But when I get about a half mile down the road, it never does it again. ... unless I stop and turn it off.[/
 




Lauri salow

New Member
Joined
January 22, 2017
Messages
8
Reaction score
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City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
I'm having the same issues with my 03 sport trac plus it happens every time I hit the brakes the locks act up and interior lights come on and buzzer goes off!
 




Weekend

New Member
Joined
March 22, 2013
Messages
12
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City, State
Cincinnati
Year, Model & Trim Level
2002 Explorer XLT 4x4
As it turns out, I had two problems. The security alarm and the random door lock/unlock problems were fixed with a new door ajar switch.

These:
1) If I take the key out of the ignition, open the door, and then press lock... the doors automatically unlock again as if the explorer thinks the keys are still in the ignition
2) If I have auto headlamps turned on, I notice my parking lights cycling on and off

Went on for a while, but eventually my battery started underperforming. A new battery ended up curing both of those... I assumed it was a control module going bad, but I don't often think about a control model being flaky because it wasn't getting enough voltage -- but this seems to be the case here.
 




Lauri salow

New Member
Joined
January 22, 2017
Messages
8
Reaction score
0
City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
As it turns out, I had two problems. The security alarm and the random door lock/unlock problems were fixed with a new door ajar switch.

These:
1) If I take the key out of the ignition, open the door, and then press lock... the doors automatically unlock again as if the explorer thinks the keys are still in the ignition
2) If I have auto headlamps turned on, I notice my parking lights cycling on and off

Went on for a while, but eventually my battery started underperforming. A new battery ended up curing both of those... I assumed it was a control module going bad, but I don't often think about a control model being flaky because it wasn't getting enough voltage -- but this seems to be the case here.
I am at my wits end with this it's like looking for a needle in a haystack
 




swshawaii

Elite Explorer
Joined
April 3, 2009
Messages
9,467
Reaction score
419
City, State
Kailua-Oahu, Hawaii
Year, Model & Trim Level
'05 Sport Trac XLS (RWD)
As mentioned by toypaseo and Weekend above, weak or faulty batteries are KNOWN to cause MANY different electrical and lighting issues and gremlins with Explorers including ST's. First thing to do is call around and find an auto parts store that can LOAD TEST test the battery
as a free service. Weak battery symptoms aren't just limited to slow cranking, no start, or dim lighting. I've even seen dash lights on ST's going berserk due to a faulty battery. Test the battery and report back.
Hello my name is Lauri, I hope you can help me! When I put on the brakes of my 2003 explorer sport trac it unlocks and locks, interior lights come on and off, door ajar light blinks on and off and a buzzer comes on and off! Can someone help me
 
Last edited:




Lauri salow

New Member
Joined
January 22, 2017
Messages
8
Reaction score
0
City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
As mentioned by toypaseo and Weekend above, weak or faulty batteries are KNOWN to cause MANY different electrical and lighting issues and gremlins with Explorers including ST's. First thing to do is call around and find an auto parts store that can LOAD TEST test the battery
as a free service. Weak battery symptoms aren't just limited to slow cranking, no start, or dim lighting. I've even seen dash lights on ST's going berserk due to a faulty battery. Test the battery and report back.
I have a new optima yellow top battery
 




Lauri salow

New Member
Joined
January 22, 2017
Messages
8
Reaction score
0
City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
I have a new optima yellow top battery in my sport trac
 




Lauri salow

New Member
Joined
January 22, 2017
Messages
8
Reaction score
0
City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
As mentioned by toypaseo and Weekend above, weak or faulty batteries are KNOWN to cause MANY different electrical and lighting issues and gremlins with Explorers including ST's. First thing to do is call around and find an auto parts store that can LOAD TEST test the battery
as a free service. Weak battery symptoms aren't just limited to slow cranking, no start, or dim lighting. I've even seen dash lights on ST's going berserk due to a faulty battery. Test the battery and report back.
I have a new yellow top optima battery
 




07gtman

Active Member
Joined
December 28, 2016
Messages
440
Reaction score
45
City, State
Chicago IL
Year, Model & Trim Level
2005 Mountaineer 4.6 AWD
i have fixed my door ajar light with wd40 spray a liberal amount on the door latch on the edge of the door open and close it several times you may have to figure out which door it is.. my 02 mountaineer does this every winter sometimes its a front door sometimes a rear i just do all of them now..
 




Lauri salow

New Member
Joined
January 22, 2017
Messages
8
Reaction score
0
City, State
Vina Alabama
Year, Model & Trim Level
2003 ford sport trac
i have fixed my door ajar light with wd40 spray a liberal amount on the door latch on the edge of the door open and close it several times you may have to figure out which door it is.. my 02 mountaineer does this every winter sometimes its a front door sometimes a rear i just do all of them now..
Thank you
 




07gtman

Active Member
Joined
December 28, 2016
Messages
440
Reaction score
45
City, State
Chicago IL
Year, Model & Trim Level
2005 Mountaineer 4.6 AWD
As mentioned by toypaseo and Weekend above, weak or faulty batteries are KNOWN to cause MANY different electrical and lighting issues and gremlins with Explorers including ST's. First thing to do is call around and find an auto parts store that can LOAD TEST test the battery
as a free service. Weak battery symptoms aren't just limited to slow cranking, no start, or dim lighting. I've even seen dash lights on ST's going berserk due to a faulty battery. Test the battery and report back.
if the wd40 does not work swshawaii is right about the gremlins some new batteries arent allways good batteries..
 




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