Electrical Issue: Commonality between these 3 ??
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Tuned
Joined: Jan 2004
Posts: 472
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From: Hickory, North Carolina
Electrical Issue: Commonality between these 3 ??
Quick trip to Ace turned into a head scratcher. Why would these 3 issues occur simultaneously ?
Door Ajar lamp stayed on. Double checked all doors.
Electric door locks would not function.
Windshield wipers would not function.
All other electrical functioned as normal. According to the fuse chart they are separate fuses but even if it was a fuse that doesn't explain the door ajar light.
This issue has plagued me off and on for quit some time and I cannot figure it out. Any help is appreciated.
David
Door Ajar lamp stayed on. Double checked all doors.
Electric door locks would not function.
Windshield wipers would not function.
All other electrical functioned as normal. According to the fuse chart they are separate fuses but even if it was a fuse that doesn't explain the door ajar light.
This issue has plagued me off and on for quit some time and I cannot figure it out. Any help is appreciated.
David
Butt-Head
Joined: Apr 2004
Posts: 9,448
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From: Reed Point, MT
They are separate fuses fed by a fusible link that's hot at all times. However, that power feed to those fuses also powers a couple dozen other circuits so it's very likely not a problem with that fusible link since the listed concerns are all you have.
The wiper motor is controlled directly by the multifunction switch on the column.
The dome lights are controlled by the instrument panel cluster so a scan tool that will access the data there will have to be used to see the inputs to that control module.
The door locks are controlled by the vehicle security module, keyless entry or not.
There is one common denominator to them all though. They all have an input from the ABS module for vehicle speed. This doesn't explain the dome lights always on, but the vehicle speed will cause them to turn off after a few seconds at a slow speed (I want to say 10-15 MPH) but I haven't looked into this issue too many times.....60% of the time it's a door latch switch every time. Also, the vehicle speed is used to LOCK the doors at speed (unless you've disabled that stupid feature). Why the wiper motor needs it, I don't know.
The wiper motor is controlled directly by the multifunction switch on the column.
The dome lights are controlled by the instrument panel cluster so a scan tool that will access the data there will have to be used to see the inputs to that control module.
The door locks are controlled by the vehicle security module, keyless entry or not.
There is one common denominator to them all though. They all have an input from the ABS module for vehicle speed. This doesn't explain the dome lights always on, but the vehicle speed will cause them to turn off after a few seconds at a slow speed (I want to say 10-15 MPH) but I haven't looked into this issue too many times.....60% of the time it's a door latch switch every time. Also, the vehicle speed is used to LOCK the doors at speed (unless you've disabled that stupid feature). Why the wiper motor needs it, I don't know.
Last edited by cleatus12r; May 31, 2026 at 06:20 PM.
Lead Driver
Joined: Jun 2004
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From: Amarillo, TEXAS!
I kind of remember some of the trucks, maybe it was only Lariat and some other high trim packages had speed sensitive intermittent wipers. I'm pretty sure there were two different multifunction switches depending whether the truck had that option or not.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
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From: Elk Grove, CA
As mentioned above the door latch switch is a pretty common problem. IIRC the fix is hit it with WD40 and open and shut several times. Easy first fix attempt.
This thread has pics and info.
The infamous door ajar/ No power lock saga - Ford Truck Enthusiasts Forums
This thread has pics and info.
The infamous door ajar/ No power lock saga - Ford Truck Enthusiasts Forums
Thread Starter
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Tuned
Joined: Jan 2004
Posts: 472
Likes: 13
From: Hickory, North Carolina
David
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Tuned
Joined: Jan 2004
Posts: 472
Likes: 13
From: Hickory, North Carolina
I can say without a doubt that I am in uncharted territory. This issue is above my head and there is nowhere local that I trust to take it to. Hope to find some sort of breakthrough here.
David
David
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Fleet Mechanic
Joined: Jan 2023
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Electrical problems are difficult, if not impossible, to diagnose simply on symptoms. Inspection, measurements and testing are usually required.
Try to fix one problem at a time. I would start with the door switch. Maybe they are all related, but probably not.
Use this link to get wiring diagrams.
https://lemon-manuals.la/Ford/
Once you are into the diagrams and are checking voltages etc, the forum can help.
Try to fix one problem at a time. I would start with the door switch. Maybe they are all related, but probably not.
Use this link to get wiring diagrams.
https://lemon-manuals.la/Ford/
Once you are into the diagrams and are checking voltages etc, the forum can help.
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Thread Starter
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Tuned
Joined: Jan 2004
Posts: 472
Likes: 13
From: Hickory, North Carolina
As mentioned above the door latch switch is a pretty common problem. IIRC the fix is hit it with WD40 and open and shut several times. Easy first fix attempt.
This thread has pics and info.
The infamous door ajar/ No power lock saga - Ford Truck Enthusiasts Forums
This thread has pics and info.
The infamous door ajar/ No power lock saga - Ford Truck Enthusiasts Forums
I also noticed when I opened the driver door that the dome light would not come on....... Frustrating.
Lead Driver
Joined: Jun 2004
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From: Amarillo, TEXAS!
Thread Starter
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Tuned
Joined: Jan 2004
Posts: 472
Likes: 13
From: Hickory, North Carolina
