What year is your Jeep I can give you the pin out for it


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It's an 05

 

I've searched the entire internet and cannot come up with a pic of the brake light switch plug behind the brake pedal.
I have no brake lights, and when I was changing out the switch behind the brake pedal I noticed a purple wire with white trace was hanging out of the harness and not connected to the plug.
There are two purple/white wires but I cannot figure out where the broken wire attaches? I don't see anywhere that I could have pulled out of?

I can't imagine it's a dead end wire.

Anyone have a pic or can take a quick pic I would be forever greatful.

Not sure if that's helpful. That's on a 98 with no cruise control currently installed. Unknown if it had it from factory.

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Not sure if that's helpful. That's on a 98 with no cruise control currently installed. Unknown if it had it from factory.

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Thanks Superduty, but my plug is different. I have 8 wires on mine. So far I figured out that the hot wire going back to the brake lights on my 05 is white with brown trace. I have power back to my third brake light but not the two tail lights.
For some reason Chrysler changed the color of the wire coming out of the main harness going to the tail light. I'm in the process of chasing the brake light wire into the harness.
What a nightmare......

I'm about to be a half ass and tap into the third brake light wiring...:rant:

 

Does that purple white possibly double up with the other purple white that is still in the plug? Similar to the green white wire?


Do you know where the purple white goes?

I'm guessing they should be joined together right there at the plug. You could probably use a scotch lok wire tap to connect it.

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I'm not sure where the purple wires go yet. The green wires have a double width metal end in the plug for the two wires, the purple does not, it's just a single metal plug like the rest?
My buddy asked me the same question but even he cannot figure out where that cut purple wire goes. It's not long enough to reach the plug yet there is no trace of where it could have went?

This is right from the 2005 Jeep Wrangler Service Manual. A Purple wire with a White chaser is "Brake Switch Output" is should be in pin 4.

I'll trace it tomorrow and see what I can find. Thanks

 

This is right from the 2005 Jeep Wrangler Service Manual. A Purple wire with a White chaser is "Brake Switch Output" is should be in pin 4.

 

 

Strange. Looks like there is only one violet (aka purple) white wire at that plug.

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Thank you both very much for the help. I have a cookout to go to & I'm going to borrow a buddy car and leave the damn Jeep at home....

I'll be back at this in the am and the diagrams will definitely help.

 

You might put 12 v to that wire and see if your brake lights come on.

You've checked fuse for brake lights?

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Putting power to the cut wire did cross my mind, but I did not try that yet. I will tomorrow. if that lights up the brake lights problem solved.

Fuse was blown yesterday when I first found that the lights weren't working. I replaced it and the new fuse hasn't blown since.

 

The violet (purple)/white wire is one of 4 for the speed control, if equipped. I think the cut one was possibly originally paired with the other one of that color just like the green/white ones in the top slot (my FSM only shows 1 wire there as shown above). However, only the white/tan & grey/red (pins 5 & 6 at the bottom in your photo) are actually for the brake lights. To test the switch, just unplug the connector & check the grey/red wire for 12v power (from fuse 2 in the fuse block behind the glove box) & if good jump from there to the white/tan wire. If that gets you brake lights, the switch is bad. If not, the problem is elsewhere.

If not the switch, check if the center brake light works even if the other 2 don’t. If you do have the center one working, report & I can advise further.

 

If you do have the center one working, report & I can advise further.

I do have power from the fuse box going into the plug from the grey/red wire. When the switch is activated it does send power to the white/tan wire. Switch is brand new. Power is going all the way to the rear via the white/tan wire, but behind the drivers side tail light four wires come out of the harness to the tail light & none are white/tan, so I'm guessing one of those is tapped into the white/tan to get power to the brake light?

I do have power to the two pins that mate to the tail gate and that's where it dead ends. The pins are removed from the gate along with the complete third brake light, wire and all.

Pretty sure if you do this you'll find that your turn signals will be all screwed up.

Haven't looked at a wiring diagram but, don't the brake lights also run up through the mutifunction switch? If so your problem may not even be at the brake light switch.

You mean the turn signal stalk? I'm not familiar, this is my first Chrysler. It's possible.

 

Back to basics for a second. How long have the brake lights not worked?

Was there anything done to jeep from time they were working to time they stopped working?



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Not sure how long they've been out. They were working when I left Ohio and drove to Orlando two weeks ago. I drove all night and I could see them light up.
I've been here two weeks and I've done fluid changes, spark plugs, and cleaned throttle body. I met some friends for lunch last Friday & one buddy was behind me for a few miles. He mentioned that my brake lights were going on and off while sitting at some red lights, but being that it's a manual & I don't always keep my foot on the brake while stopped so I never gave what he said a second thought.
Then the Jeep sat until this past Thursday when I put on the new exhaust and wheels/tires. I told my buddy to drive it around the block so that I can hear the new exhaust, when he pulled in the drive way I noticed the brake lights weren't working.
First thing I checked was the fuse, It was blown so I replaced it and still no lights. This morning I bought a new brake light switch and still no brake lights. Fuse is still good.

 

I've got power going thru the new brake light switch and to the rear of the Jeep via the white/tan trace wire.
I've removed and reinstalled both tail lights from the tub of the Jeep, so They are both getting a good ground.
All other lights function properly, tail lights, reverse lights, turn signals, 4 ways, and power to the third brake light pins. Just no brake lights.??

 

I'm not sure where the wires run to the rear lights, but any possibility one of them were melted by the new exhaust? Or something got pinched with the exhaust.

OR, is more likely the problem was showing up when your friend saw them going on off at the light? Prior to the exhaust.


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I'm not sure where the wires run to the rear lights, but any possibility one of them were melted by the new exhaust? Or something got pinched with the exhaust.

OR, is more likely the problem was showing up when your friend saw them going on off at the light? Prior to the exhaust.

The wires run down the drivers side just below the door opening all the way to the rear, then thru a rubber grommet behind the roll bar down behind the left taillight. 4 wires then come out of the harness to the light, the harness continues to the right side light.
I've chased the harness the entire route and see nothing damaged.

The part that's confusing is 1 wire carries the juice from the brake light switch to the rear of the Jeep. and that juice IS making the journey all the way to the third brake light pins near the tail gate, but not the tail lights?

It's no where near the exhaust. I'm thinking this started before the exhaust.
I'm going to research the multi function switch (turn signal switch) and see if there is any correlation.

When searching for connector pin out and image try here

Mopar Connection Repair Kit

http://connectors.com

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Thanks, Saved in my Jeep file

 

I'd probably focus for a bit on the modifications and repairs that were done from the time they were working to the time they weren't.

The culprit will most likely be found there.

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When searching for connector pin out and image try here

http://connectors.dcctools.com/home.htm

http://connectors.com





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According to the wire diagram (link) that Digger posted the white/tan brake light power wire does run thru the multi function switch.
I'm going to take my multi switch apart and do some investigating. If I can get the brake lights to come even for a second when fiddling with it That's where the problem lies.
It's a $50 part thru Rockauto. And it should also solve the issue of the turn signals not cancelling from time to time.
I'll report back what I find.

 

My experience with aftermarket multifunction switches is that they are crap

Also as I remember on the 03-06 be aware there are 2 different ones for with and without fog lights/switch


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I agree, I will never buy any Duralast items from Autozone. Absolute junk.
The switch I found was AIRTEX/WELLS 1S2949 on Rockauto. $50 with fog lamps. Not sure of the quality, but I'll give it a try.

 

I'm still a little curious why that wire is just hanging there by the plug. But since you found the problem, not much reason to spin your wheels on that.

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You and me both. As soon as it stops raining I'm going to click the new brake light switch back onto the bracket and test every light, etc.

That wire does not go into that plug from what I can see. I'm almost afraid to put power to it fearing I may backfeed something and cause another electrical issue.

If everything works including canceling the cruise with the brake pedal I'll just try to forget that wire even exists. I'm hoping someone with an 05-06 w/cruse will come along and post a pic of their harness.

 

If you don't already have the FSM I suggest you download it for future use.

http://www.jeepslimited.com/index.p...ep-wrangler-tj-tj-1997-2006/tj-service-manuals/135-2004-tj-service-manual-51-mb

If that doesn't work you'll have to setup an account then download it.

Jeeps Limited - About

Then in the wiring diagrams you should be able to find your mystery wire and where it goes.

 

This is an absolutely amazing resource! Thank you for posting.
I've been searching each schematic & the only thing I can see that shows a violet/white wire is the cruise control cancel but I'm only seeing one wire not two.
I'm going cross eyed.... I'll keep looking.
I test drove and the cruise works fine.

 

Saved. Thanks I'll check it out

 

Knowing you have power to what would be the center brake light says the switch is good. That wire splices & also goes to the multifunction switch. From there it goes through the switch & on to the l & r taillights. That is because the brake lights are used as turn signals too. So the m-f switch turns off the brake light & flashes it when signaling or both lights when the hazards are on. So a bad m-f switch or bad wire connection to it can cause the l & r brake lights to stop working but still allow the signals & hazards to work.

 

I had some small LED's laying around, so this morning (I was bored I admit) I wired up a dash mounted led that will let me know if/when my brake lights are working.
I tapped into the brake light wire in the harness that powers the left brake light, not the third brake light which still has constant power despite a malfunctioning multifunction switch.
It's just for my peace of mind & will give me a heads up in the future if a new MF switch craps out.
I'll most likely swap out the blue led for a dimmer red one, but I had this one laying around.