Notices
1999 - 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
Sponsored by:
Sponsored by: Real Truck

Smart Juncton box

Thread Tools
 
Search this Thread
 
Old Sep 5, 2016 | 08:33 PM
  #1  
mich800's Avatar
mich800
Thread Starter
|
Senior User
Joined: Dec 2005
Posts: 168
Likes: 0
Smart Juncton box

Not getting much response in the 6.4 forum. Maybe there are more electrical people here.

All my door locks stopped working in my 2008 F250 Crew Fx4. Locks do not work from driver or pass. door, key fob, or door keyless pad. When you hit any of the switches you can hear a relay type sound in the SJB.

There was some sort of failure because we could smell it. But I am not sure if it was the SJB that failed or a wire between the SJB and the lock motors.

Does anyone have a wiring diagram for the door lock circuit? And/or know how to troubleshoot to find the bad wire or if it is the SJB that failed.
 
Reply
Old Oct 7, 2016 | 09:04 PM
  #2  
Parklife1977's Avatar
Parklife1977
New User
Joined: Oct 2016
Posts: 4
Likes: 0
Door locks

Hello having the exact same problem same. What did you do about it? Same clicking sound. And I know I had a smell. Does you radio turn on when you click the button to many times when the truck is off?
 

Last edited by Parklife1977; Oct 7, 2016 at 09:08 PM. Reason: Other message
Reply
Old Oct 8, 2016 | 08:10 AM
  #3  
The Bone's Avatar
The Bone
Cargo Master
10 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2015
Posts: 2,338
Likes: 255
From: Livermore Ca.
Club FTE Gold Member
I would check the switch in the door. If they get water in the switch from condensation they will short out. Look for a burnt connector also.
 
Reply
Old Oct 8, 2016 | 10:04 AM
  #4  
Parklife1977's Avatar
Parklife1977
New User
Joined: Oct 2016
Posts: 4
Likes: 0
I checked both switches and conectors last night. Everything appears to be normal. I also checked the wiring between the doors and the "A" and "B" posts, in the door sills, again everything appears to be normal.

Just like with mich800 I smelled something strange but thought it might be something outside when it happened but smelled electrical burning. Right after that I discovered the door locks stopped working. So my issue is the door locks do not work no matter if I use the key fob, door switches or keyless entry pad.

When the truck is off you can here a light click in the SJB. If you press the door unlock button fast enough while the truck is off the radio comes on, and while the radio is on if you pull up on the window switch the doors unlock, but if you push down the window rolls down (but you have to be pushing the unlock button simultaneously).

I have fords diagnostic flow chart written in fordinese. That really netted me nothing except going back to the SJB.
 
Reply
Old Oct 8, 2016 | 11:04 AM
  #5  
Parklife1977's Avatar
Parklife1977
New User
Joined: Oct 2016
Posts: 4
Likes: 0


Here is 1 of 2
 
Reply
Old Oct 8, 2016 | 11:06 AM
  #6  
Parklife1977's Avatar
Parklife1977
New User
Joined: Oct 2016
Posts: 4
Likes: 0


Here is 2 of 2
 
Reply
Old Mar 28, 2017 | 04:23 PM
  #7  
Dan Parker's Avatar
Dan Parker
New User
Joined: Mar 2017
Posts: 1
Likes: 0
parklife1977

Originally Posted by mich800
Not getting much response in the 6.4 forum. Maybe there are more electrical people here.

All my door locks stopped working in my 2008 F250 Crew Fx4. Locks do not work from driver or pass. door, key fob, or door keyless pad. When you hit any of the switches you can hear a relay type sound in the SJB.

There was some sort of failure because we could smell it. But I am not sure if it was the SJB that failed or a wire between the SJB and the lock motors.

Does anyone have a wiring diagram for the door lock circuit? And/or know how to troubleshoot to find the bad wire or if it is the SJB that failed.
Mich800 have you fixed the problem, just took mine to ford today. They tried to replace the SJB and did the same thing. Did you ever find the issue and if so what was it?
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Haleyinthevalley
2007 - 2014 Expedition & Navigator
3
Jan 18, 2024 11:30 AM
brooksa44
Excursion - King of SUVs
5
Oct 29, 2018 09:28 AM
7.3 Rocket
1999 - 2003 7.3L Power Stroke Diesel
4
Nov 10, 2013 08:47 PM
odin2
2004 - 2008 F150
3
Dec 30, 2012 07:16 PM
Trevor1
1987 - 1996 F150 & Larger F-Series Trucks
1
Jan 4, 2008 04:04 AM




All times are GMT -5. The time now is 08:04 AM.

story-0
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-1
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-2
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-3
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-4
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-5
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-6
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE
story-7
10 Most Surprising 2026 Ford Truck Features!

Slideshow: 10 most surprising Ford truck options/features in 2026.

By Joe Kucinski | 2026-05-05 11:17:22


VIEW MORE
story-8
Top 10 Ford Trucks Coming to Mecum Indy 2026

Slideshow: Here are the top 10 Fords coming to Mecum Indy 2026.

By Brett Foote | 2026-05-04 13:49:49


VIEW MORE
story-9
5 Best / 5 Worst Ford Truck Wheels of All Time

Slideshow: The 5 best and 5 worst Ford truck wheels of all time

By Joe Kucinski | 2026-04-29 16:49:01


VIEW MORE