Well my problem was solved today, mine was a connector that worked itself loose somehow, behind front drivers side kick panel.

 

I have a 2003 f250 7.3 that is have the same issues with radio, no door ajar light, doors won't auto lock when driving, no auto headlights, and no dome lights when I open the doors. I replaced the vsm with a new one and nothing changed, would a f250 have the same wire in the same place? This is about to drive me insane!!!

 

i honestly dont even know what i did... i took the rear sill plate off... checked wires for corrosion... not visible and didnt have the two purple wires just one ... took off the drivers kick panel jiggled the wire connections in there and for some strange reason the radio was turning off when the key was removed and door was open... i dont expect it to last however but i will see what progresses...

 

I have an 04 lariat F150 screw 4x4 that I purchased in October with 83k miles. Honestly, I've never had so many problems with a vehicle in my life and I've only had this thing for 5k miles...but I won't get into all that. I fixed the purple wire in the door sill a few months back thanks to this site (along with most of the other crap), as well as the dome light that was leaking. Recently, I noticed that my radio stayed on again after I got out of the truck. I shut the door again a few times and no change...same data errors on the dash and exact same symptoms I was having before I fixed the purple wire. I figured maybe my splice came loose. Pulled everything apart, re-stripped the wires, cleaned them with acid to get the copper nice and shinny, soldered on a new jumper wire and no change. I still have the issue. So the connection is now broken somewhere else. I took off the drivers kick panel and all that stuff seemed normal, jiggled everything and unplugged/plugged everything and no change. Checked all along the floor boards from front to back and it looks pretty normal, been dry in there ever since I fixed the 3rd brake light leak. I pulled the door cover off the drivers side to check to see if anything had disconnected or come lose, but everything looks like it's connected as normal, and the door mechanism and switch all seem to be working fine.

Does anyone know where that purple wire goes after it passes into the back of the cab? Is there a computer back there, or another connector somewhere? I'm assuming the problem is in the back, because that's where the water damage was from the 3rd brake light leaking for god knows how long. I guess it's not the end of the world if I can't fix it, but just super frustrating. I bought this truck to tow my 1970 911 to track events, and I end up spending more time working on my tow vehicle than I do my hobby car.

 

Had the same issue on my 06 SCREW. Not sure it's set up the same but I disconnected the battery and pulled each of the relays out of the right (passenger) side junction box. Put them all back in, reconnected the battery and all was right with the world again. That was a couple of years ago and no issues since.

 

I had the same problems, looking for the purple wire in mine (doesnt exist in my 07 xlt) i took it to the stealership, turned out my connector behind drivers kick panel worked it way loose check that.

 

did you find it yet?

 

I followed the purple wire to connection block left front drivers side behind e-brake. Bad connection. Rat's nest of wires. Subject to corrosion. Issue solved until next time.

 

Found the purple wires under rear sill plate back door drivers side! Just pull the purple wire a little. It will break very easy! Broken wire marks the problem! Splice together! All problems solved! This is for the f150 2004 Lariat! Thanks to all that posted the remedy !

 

Can u send me pics. Im experiencing the problem now

 

I only was successful by the picks I found on this site. They had good pics posted! It has been the answer to the problem since!

 

See post 98 for pictures showing how to locate the wire splice that may be the problem.

 

In my 2008 Ford F150 King Ranch. When I open the Driver door the dome light does not come on but other doors when opened do activate the dome light. Also, when the driver door is opened the Radio does not automatically turn off. All the window and locking switches in the door work, Any suggestions?

 

Check the switch in the latch for the driver's door. Give it a WD40 "high colonic" (google it).

 

After having the problem with water getting into the wire trough and causing the wire splice to stop working, I removed the third brake light and found that the rubber gasket was misaligned. I just realigned it and screwed it back down, and it no longer leaks.