'06 Liberty, brake lights not working. - JeepForum.com
LinkBack Thread Tools
post #1 of 6 Old 12-14-2011, 09:44 PM Thread Starter
Registered User
2006 KJ Liberty 
Join Date: Dec 2011
Location: Alexandria
Posts: 3
'06 Liberty, brake lights not working.

None of my brake lights are working, including the top-mounted brake light on the back glass. I've replaced the bulbs and fuses #7, #9 and #12 with no luck. Turn signals/hazard lights work just fine.

After searching the forum for similar issues, I determined that it's probably a faulty brake light switch or a grounding issue with the wiring running to the assembly. I ordered a brake light switch online, but I've no idea how to install it when it arrives and only a vague idea of where it's located. So my questions are as follows:

1. Can someone post a guide on how to replace the brake light switch, starting with exactly where it's located?

2. If the switch is not the problem, how exactly would I go about testing the wire with a multimeter from the switch to the brake light assemblies? How would I test the full length of the wire seeing as how the wires are concealed inside the vehicle? Would I need to pop off multiple pieces inside the Jeep to access the wire at various points?

I'm a complete rookie at the wiring thing, so if the brake light switch replacement doesn't work, I may just end up taking it to my mechanic. I'd like to try and repair it by myself first, though, regardless of what the problem is.


spittingglass is offline  
Sponsored Links
post #2 of 6 Old 12-14-2011, 09:52 PM
Registered User
2002 KJ Liberty 
Join Date: Dec 2009
Location: Colorado
Posts: 8,393
The brake light switch in located on the brake pedal,just pull the under-dash panel off(two 7mm bolts) and look for the little switch with a plunger on the brake pedal.Easy way to test if it's bad is to disconnect it the connector to it,take a paper clip and jump the 2 wires together in that connector.If the brake lights come on it';s a bad switch,if not then you have another issue somewhere else.Should have constant battery voltage(12+ volts) at one of those wires also regardless if the ignition is on or off.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
tjkj2002 is offline  
post #3 of 6 Old 12-15-2011, 05:29 AM
Registered User
2002 KJ Liberty 
Join Date: Jul 2007
Location: White River in the Bush, South Africa
Posts: 1,426
I do not know about the 2006 models but on my 2002 it is not a little switch...it is quit large and is actually two switches in one. The FSM for the 2002 model states that the switch cannot be removed and put back again or adjusted and that the one switch is for the brake lights while the other switch is for the cruise control cut-out.
I saw a post by someone else claiming that the two switches are connected together in a fail-safe form but this may only apply to later models.
What I would do is to first jam the brake pedal down and then measure with a voltmeter at the brake lights to see if +12 volts is there but maybe a ground is missing and then start testing for voltage at the switch.
You ideally need a circuit diagram for the 2006 models...I believe there is a link for this over at Lost but otherwise try search www.Scribd.com for 2006 Liberty KJ circuit diagrams or something similar.
Billwill is offline  
post #4 of 6 Old 12-15-2011, 07:29 AM
2006 KJ Liberty 
Join Date: May 2011
Location: Pittsburgh, Come Get me, sissy!
Posts: 195
It is a SIX wire harness switch, and you need to know which two wires to short for testing. There are other signal wires in the brake switch, among the actual brake light voltage. You simply twist and remove, then you can manually manipulate the plunger, and test the brake line, which should be Tan/White? There is one ground wire used in it. There is a constant 12V source into the switch, which is put to the brake line when the pedal is depressed and the plunger extends. The other wires are for TCC lockup control, and Cruise Control...

I have pulled mine out, and put it back in, no problems. It does say not to reinstall the same switch once you remove it, never saw that before... I have only had one fail on me, if was for a 2000 Cirrus LXi. They are easy to replace if needed.
Powerslave is offline  
post #5 of 6 Old 12-15-2011, 05:25 PM Thread Starter
Registered User
2006 KJ Liberty 
Join Date: Dec 2011
Location: Alexandria
Posts: 3
Ok, thanks guys. I'll report back in once I have the switch in-hand.
spittingglass is offline  
post #6 of 6 Old 02-25-2015, 01:01 PM
Registered User
2008 WK 
Join Date: Feb 2015
Location: DUNDAS
Posts: 2
Similar problem, strange outcome....

I've read through the forums, was very intrigued by the brake light issues, and might have a little insight into this issue.
I understand the tailight faults, the grounding issues, and the possible broken wire problems in these circuit, but, was very curious about all the outcomes.
Let me first say that the problems with the ESP/BAS, and ant-skid lights suddenly coming on did NOT begin this journey, but, something a little different. Back in October, when applying the brakes one day, the above mentioned dash lights came on, along with a circuit "bleed" to my left signal light, which means that sometimes, when I applied the brakes, the left signal light, on the dash, would come on faintly, and intensify, the harder I pressed on the brake pedal!!
OK, obviously, or,by chance, I thought right away...aha, it's the brake switch, which under normal circumstances, is an easy in and out fix.
I order a new brake switch, aftermarket, it arrived, installed it as instructions portrayed, and voila, the ESP/BAS lights went out after resetting the engine light, the left signal light did NOT bleed on, BUT, I had NO BRAKE LIGHTS!!. So, I thought, aha, it's a faulty switch again, but, I went through the circuit issues, followed them from front to back, and no remedy.
So, I sent the defective switch back, got a refund, and replaced it with an OEM, by Mopar brake switch, and though the ESP/BAS lights did NOT come on, and the left signal light did NOT come on, I STILL had no brake lights AND, the SEL light came back on...what the !!!!
I went to our local Canadian Tire store, they had one in stock, so, bought it, took the old one out, the dealer refused to refund a "used" electrical part, even though it was installed for maybe 10 minutes.
I installed the one from Canadian Tire, and AGAIN, had the same issue as above....NOW I'm getting stupid mouthed, and this is getting ridiculous...so, went through THE WHOLE wiring harness front to back, looking for obvious/unobvious wire breaks/frays, and found NONE...had full conductivity, front to back. I was very frustrated!!...put it all back together, STILL, no brake lights.
I pulled the Canadian Tire supplied switch, took it back, they replaced it no questions, and thought, ONE MORE TIME, then I'm REALLY gonna ***** to Chrylser about the dangers of their design flaws after reading all your posts about these problems.
I installed the new switch AGAIN, for the 4th time, reset the ECU, and VOILA, everything works, no dash lights on, brake lights all work properly, and the issues have disappeared.
I can tell you from personal experience, that just because you've replaced the brake switch, and it's NOT solved the problem, DOESN'T mean that it MUST be some "other" problem!!
It's all working now.....I'm almost giddy!! Now, it's "giddy up jeep time once more!!"
mikeyflowerguy is offline  

Quick Reply

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


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

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Dash lights not working - 2002 Liberty eastenderguy KJ Liberty Forum 3 07-02-2015 01:43 PM
One brake light not working when lights on d5332 KJ Liberty Forum 11 12-02-2013 08:46 PM
Brake lights not Working clnlibrty KJ Liberty Forum 6 08-30-2011 06:12 AM
05 liberty brake lights alexfiggy KJ Liberty Forum 0 01-11-2009 06:46 PM
trailer turn-signals and brake lights not working with Jeep Ducatista KJ Liberty Forum 3 06-12-2006 08:06 AM

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