Ford E-150, SBJ, BCM, Diode Isolating Door Pins

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=145965
Printed Date: May 09, 2025 at 6:26 PM

Topic: Ford E-150, SBJ, BCM, Diode Isolating Door Pins

Posted By: bobbyz
Subject: Ford E-150, SBJ, BCM, Diode Isolating Door Pins
Date Posted: January 22, 2020 at 9:22 PM

Ok newbie DIY alarm install. What is the SJB and BCM? Smart Junction box? I just installed a viper system in My ford e 150 and it goes off about 20 minutes after arming. How do I install diodes at pin switches and do I need them at all 4 ?
Thanks for any help guys! Someone tried to steal my work van and I need to get this working, Im tired of disconnecting my battery and locking hood with a chain every night!

-------------
bobbyZ

Replies:

Posted By: catback
Date Posted: January 22, 2020 at 9:44 PM

Yes, SJB is Smart Junction Box and BCM is Body Control Module

You need to wire up every door you wish to be able to trigger the alarm and install the diodes per Tech Document 1076 https://www.the12volt.com/installbay/uploads/1076.pdf

Posted By: bobbyz
Date Posted: January 22, 2020 at 10:13 PM

Is there a picture showing an actual installation of a diode. Do you just wire it inline by cutting the trigger wire for each pin switch? Just wrap with tape or shrink tubing?

-------------
bobbyZ

Posted By: kreg357
Date Posted: January 23, 2020 at 5:51 AM

Here you go. These photos were "on-the-bench" and not in a vehicle so these are optimal conditions.

What you need:
Heat shrink tube
1N4001 diode ( 1N4004, 1N4007 etc will work )
Diagonal cutters
Wire strippers
Soldering iron
Solder
Heat sink ( alligator clip )
Bic lighter or heat gun

posted_image

-------------
Soldering is fun!

Print Page | Close Window