Brake light issue NEED HELP!! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Pontiac When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-22-2015, 09:58 AM   #11
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2015
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Jhansen101 is on a distinguished road
Default

Quote:
Originally Posted by Tech II View Post
Any aftermarket accessories installed?

With the brake switch disconnected, those brake lights should not be on....

Power to the brake switch is constant.....so if the key is out of the ignition, and the brake lights are off, and you step on the brake pedal and they come on, the circuit and switch are ok......

So either, there is an aftermarket problem, or somehow the circuit out of the brake switch is shorted to voltage.....

What you can try, with the brake switch disconnected, pull fuses one at a time, and see when the lights go out, and this will point you in the direction of the circuit that is causing the problem....
i have leds on the inside and on grill but those are connected to a different power source. i disconnected those just to see if it would make a difference and never did. I also have aftermarket stereo but i put that in right after i got the car over a year ago.
Jhansen101 is offline   Reply With Quote
Old 10-22-2015, 03:37 PM   #12
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Oct 2015
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Jhansen101 is on a distinguished road
Default

so i started pulling fuses with the brake light switch disconnected, i got 3 in and lights went out so i looked at what it was and its the ign sw. which is the ignition switch i believe. so does that mean i need new ignition switch or?
Jhansen101 is offline   Reply With Quote
Old 10-22-2015, 11:29 PM   #13
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,143
Thanked 780 Times in 609 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

Not really....the fuse may power the ignition switch, but the ignition switch has several "legs" out of it that feeds various circuits.....you would need a wiring diagram to trace it out....

Take your time, tracing wiring circuits is very labor intensive, unless, during a visual inspection, you notice something obvious....

This is a diagram for a 2001...your'* should be similar.....

As you can see, circuit #20 comes out of the brake switch....with the harness disconnected, and looking at connector C2, terminal B, the light blue wire....if you probe that wire with a test light attached to ground, it shouldn't light, but it probably will if the brake lights are on....this is the circuit that is shorted to power, or has some aftermarket device in the circuit....this line goes through the rear fuse block...I suggest removing the lower rear seat, and see if you see any additional wiring going to the fuse block....also try grabbing the harnesses in and out of the block and give them a tug while someone watches the brakes lights....if nothing happens, take the palm of you hand, and give the fuse block a few whacks and see if this has an effect on the light....I have seen problems with connections under the fuse blocks in the engine compartment, but haven't seen them under the rear seat...but there is always a first time....



Attached Thumbnails
Brake light issue NEED HELP!!-0996b43f80244ac5.gif  
Tech II is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help with possible 4L80E issue on 1500 HD - winding gear noise on coast or brake K-Rod GMC/Chevrolet Truck/SUV 4 04-05-2015 09:30 PM
'99 Tahoe, rear brake drum issue. Need help hdryder GMC/Chevrolet Truck/SUV 2 06-03-2014 08:08 PM
Check Gages-BRAKE light, trac off light, and Antilock light all on MissRockstar04 2000-2005 9 07-07-2009 05:12 PM
abs and brake light issue kaptnjack 1987-1991 8 12-24-2006 03:20 AM
Brake Lines brake lines oh god brake lines disco_dotty 1987-1991 14 01-19-2005 08:38 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off



All times are GMT -4. The time now is 09:19 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.