Instrument Back-lighting mystery - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Instrument Back-lighting mystery

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineOconeeoffroad.com Prothane bushing sale Blowing out inventPoison spyder items @ oconee off road 706 534 9955

Reply
Unread 01-03-2014, 10:29 PM   #1
candersonTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2014
Location: Edmond, Oklahoma
Posts: 6
Instrument Back-lighting mystery

I had my TJ for three year now, and I've had one persistent problem being that the back-lighting in my instrument cluster and A/C controls have not worked for as long as I have had it. I have checked and rechecked every fuse, connector, wire, switch, light bulb, relay and ground in the dash and under the hood. From there I replaced my multifunction/ dimmer switch, but that also didn't work. When I first bought my Jeep the previous owner had hastily installed a JVC head unit, which I rewired, however it still has three unused wires orange (dimmer), light blue (power ant.?), and brown (not matched to a wire on the factory radio plug) I don't thing these wires would cause my problem, but I could be wrong. One other thing I noticed is my TJ doesn't have a security bracket or large radio ground wire behind the radio, possibly due to it being a 2003, but I'm not sure about that either. Any help or ideas would greatly be appreciated. Other wise I would have to believe the previous owners alien encounter/ abduction story.

candersonTJ is offline   Reply With Quote
Unread 01-04-2014, 09:57 AM   #2
2003RubiBlue
Registered User
2003 TJ Wrangler 
 
Join Date: Nov 2008
Location: Boston, MA
Posts: 661
I don't think the head unit is causing your problems, wiring sounds pretty normal. On the other hand I have had problems with those little light bulbs that go behind the instruments needing the mating surface of the board cleaned very carefully to make good contact. Just takes a tiny bit of corrosion to stop them from working. Although that was always one bulb here and one bulb there, as a matter of fact the one behind my fuel gauge is doing it right now but I have just been hitting the top of the cluster to get it to come on for the last year or so. Lol. The bracket behind the radio wa smost likely removed during insttallation of the new head unit. Maybe he was abducted....

Brian
__________________
Quote MrBlaine:
"That's awesome advice. Anytime I have a difficult repair, I fix something else that's much easier to get to. This one time, there was a hole in the oil pan so I replaced the side mirror on the driver's door."
Wanted: Tuffy rear underseat drawer. PM me if you have one.
2003RubiBlue is offline   Reply With Quote
Unread 01-04-2014, 12:21 PM   #3
candersonTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2014
Location: Edmond, Oklahoma
Posts: 6
I've cleaned all of the bulb mating surfaces with alcohol and that didn't work either lol
candersonTJ is offline   Reply With Quote
Unread 01-05-2014, 04:50 PM   #4
2003RubiBlue
Registered User
2003 TJ Wrangler 
 
Join Date: Nov 2008
Location: Boston, MA
Posts: 661
Huh, sorry I guess you do have a weird issue on your hands. Weird...
__________________
Quote MrBlaine:
"That's awesome advice. Anytime I have a difficult repair, I fix something else that's much easier to get to. This one time, there was a hole in the oil pan so I replaced the side mirror on the driver's door."
Wanted: Tuffy rear underseat drawer. PM me if you have one.
2003RubiBlue is offline   Reply With Quote
Unread 01-06-2014, 01:53 PM   #5
Jonny Jeep
Web Wheeler
 
Jonny Jeep's Avatar
1997 TJ Wrangler 
 
Join Date: Feb 2007
Location: Manchester, UK
Posts: 4,654
Unfortunately, the dash/cluster illumination is driven by a driver circuit inside the cluster. The driver circuit is known to fail in some TJs, and the circuit is unrepairable as far as I am aware.

If you don't mind the dash/cluster illumination being lit at full brightness all the time, there is a work around that can be done. The black/yellow wire that supplies the front marker lights and tail lights can be tapped to the orange wire that supplies the illumination for the dash/cluster - one section of which you have found behind the radio. It's obviously not an ideal solution but it has been done before, works, and I've heard of no problems as a result of this work around.
__________________
"Giving English to an American is like giving sex to a child. He knows it's important but he doesn't know what to do with it."
Adam Cooper (19th century)

Rockauto 5% discount code can be found here... http://www.markviii.org/LOD2/products_services.htm

Online factory service manuals (FSMs) and parts lists can be viewed at http://www.jeep4x4center.com/knowledge-base/index.htm
If the link doesn't work properly, look for the service manual link under Jeep Resources at the bottom of the page.
Jonny Jeep is offline   Reply With Quote
Unread 01-08-2014, 02:10 PM   #6
candersonTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2014
Location: Edmond, Oklahoma
Posts: 6
Thanks Jonny Jeep, I'll give it a try
__________________
For the Garnet and the Gold shall never grow old in the heart of every PiKA
candersonTJ is offline   Reply With Quote
Unread 01-08-2014, 06:32 PM   #7
candersonTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2014
Location: Edmond, Oklahoma
Posts: 6
For this fix, do I need to run a wire bridging the orange wire on the black plug to black/yellow on the white plug, behind the instrument cluster?
__________________
For the Garnet and the Gold shall never grow old in the heart of every PiKA
candersonTJ is offline   Reply With Quote
Unread 01-09-2014, 07:58 AM   #8
Jonny Jeep
Web Wheeler
 
Jonny Jeep's Avatar
1997 TJ Wrangler 
 
Join Date: Feb 2007
Location: Manchester, UK
Posts: 4,654
I'll check connectors in the fsm later. . The black/yellow wire from the multifunction switch supplies the front and rear marker lamps so needs to be tapped rather than cut. The orange dash illumination wire could just be connected near the radio if it's not in use there. That will then supply all the dash and cluster lights.

Sent from my ST27i using JeepForum
__________________
"Giving English to an American is like giving sex to a child. He knows it's important but he doesn't know what to do with it."
Adam Cooper (19th century)

Rockauto 5% discount code can be found here... http://www.markviii.org/LOD2/products_services.htm

Online factory service manuals (FSMs) and parts lists can be viewed at http://www.jeep4x4center.com/knowledge-base/index.htm
If the link doesn't work properly, look for the service manual link under Jeep Resources at the bottom of the page.
Jonny Jeep is offline   Reply With Quote
Unread 01-09-2014, 01:23 PM   #9
candersonTJ
Registered User
2003 TJ Wrangler 
 
Join Date: Jan 2014
Location: Edmond, Oklahoma
Posts: 6
I figured it out, I just tapped into the orange and black/yellow wires behind the instrument cluster and they are working just as you said, thanks for the help!
__________________
For the Garnet and the Gold shall never grow old in the heart of every PiKA
candersonTJ is offline   Reply With Quote
Unread 01-09-2014, 01:24 PM   #10
Jonny Jeep
Web Wheeler
 
Jonny Jeep's Avatar
1997 TJ Wrangler 
 
Join Date: Feb 2007
Location: Manchester, UK
Posts: 4,654
Jolly good!
__________________
"Giving English to an American is like giving sex to a child. He knows it's important but he doesn't know what to do with it."
Adam Cooper (19th century)

Rockauto 5% discount code can be found here... http://www.markviii.org/LOD2/products_services.htm

Online factory service manuals (FSMs) and parts lists can be viewed at http://www.jeep4x4center.com/knowledge-base/index.htm
If the link doesn't work properly, look for the service manual link under Jeep Resources at the bottom of the page.
Jonny Jeep is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.