What is a heated backlight and do I need it? - JeepForum.com
 
LinkBack Thread Tools
post #1 of 8 Old 01-06-2018, 10:41 AM Thread Starter
mikwallace
Member
 
mikwallace's Avatar
1990 YJ Wrangler 
 
Join Date: Jan 2016
Location: Huntsville
Posts: 282
What is a heated backlight and do I need it?

Iím in the process of removing oem MCU and any associated wiring not required. Iíll add the Performance Fuel Injection Systems TBI conversion with MCU. During this process Iíve made an attempt to trace every wire and using the FSM determine which wires I want to keep, even if from old system, to adapt to future use. Iíve run across a wire:

-Brown/with white tracer
-Bulkhead Connector A5
-Labeled Heated Backlight

What is ďHeated BacklightĒ?
Do I need it?

Thanks!

Hereís a picture of what Iíve pulled out thus far!

img_7093.jpg

And whatís remaining!

img_7094.jpg


Sent from my iPhone using Tapatalk

mikwallace is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 01-06-2018, 11:47 AM
timatoe
Registered User
 
timatoe's Avatar
1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley
Posts: 17,749
No idea about a heated backlight. You sure it's not the manifold heater?

Quote:
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
timatoe is offline  
post #3 of 8 Old 01-06-2018, 12:09 PM Thread Starter
mikwallace
Member
 
mikwallace's Avatar
1990 YJ Wrangler 
 
Join Date: Jan 2016
Location: Huntsville
Posts: 282
No, I'm not sure, but don't think it is the manifold heater. It's a brown w/white tracer wire that goes from the bulkhead connector (engine harness side) to the 1"x2" diode circuit board next to the diagnosis connectors. I can't remember the purpose of diode board? The FSM says "heated backlight".
mikwallace is offline  
 
post #4 of 8 Old 01-06-2018, 12:21 PM
fishadventure
Web Wheeler
 
fishadventure's Avatar
1989 YJ Wrangler 
 
Join Date: Jul 2013
Location: Morrisville
Posts: 7,663
Garage
heateR backlight? Maybe a tiny typo?
Or a BIG typo and the whole phrase is whacked.

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
fishadventure is online now  
post #5 of 8 Old 01-06-2018, 12:26 PM Thread Starter
mikwallace
Member
 
mikwallace's Avatar
1990 YJ Wrangler 
 
Join Date: Jan 2016
Location: Huntsville
Posts: 282
Well, I found this info about the diode board:

https://www.jeepforum.com/forum/f12/p...y-tray-939460/

It appears I don't need the board, just gotta trace the br/wh wire inside the cabin and see if I can use it for something else.
mikwallace is offline  
post #6 of 8 Old 01-06-2018, 03:00 PM
crackedcornish
Registered User
 
crackedcornish's Avatar
1988 YJ Wrangler 
 
Join Date: Feb 2012
Location: Yuma
Posts: 1,395
heated backlight = rear window defroster

Orange Jeep Club #88

˙ɹǝʌo ɹǝʇndɯoɔ ɹnoʎ dılɟ sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
crackedcornish is offline  
post #7 of 8 Old 01-06-2018, 03:06 PM Thread Starter
mikwallace
Member
 
mikwallace's Avatar
1990 YJ Wrangler 
 
Join Date: Jan 2016
Location: Huntsville
Posts: 282
Quote:
Originally Posted by crackedcornish View Post
heated backlight = rear window defroster


Yep!! Just found it too!! The br/wh wire comes from diode board next to-diagnostic port to bulkhead then through firewall to rear window defogger relay ( of which I donít have) then to harness through switch to rear window.

FSM, electrical, page 8W-136&137.

This FSM is great!!!

Thanks for the help!!


Sent from my iPhone using Tapatalk
mikwallace is offline  
post #8 of 8 Old 01-06-2018, 08:12 PM
timatoe
Registered User
 
timatoe's Avatar
1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley
Posts: 17,749
Hmm, interesting. I pulled all of that stuff out by the diagnostic ports when I went FI. (except the manifold heater relay)

Quote:
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
timatoe is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome