No brakes lights 98% of the time. - Ford Focus Forum, Ford Focus ST Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 07-15-2014, 09:56 AM   #1
4flattires
Focus Rookie
 
Join Date: Jun 2010
Fan#: 76250
Location: Air-id-zona, AZ
What I Drive: 2007 ST

Posts: 23
FF Reputation: 2 4flattires Good Standing Member
Buy-Sell-Trade Rating: (0)
No brakes lights 98% of the time.

Perplexing to me....2007 Focus ST.
All 3 lights wont work, but soooooometimes they will flicker on for a nano-second when depressing the pedal.

I am troubleshooting via the big book, page 417-01-21. I am doing pinpoint test G1.

Known items:

Bulbs good (e-flashers light up the bulbs too)
Pedal switch tests good (DVOM)
Fuse good, 12v both sides.

When I test at the stop lamp circuit connector (GN/WH) I should get 10+ V. I get .5, but soooooomtimes I'll get the full 12v. This can explain the "flicker on" effect.

? Does anyone have the circuitry page that covers the CJB to GEM so I can trace faults? There are alot of GN/WH wires under that dash.

A scan would be fantastic!

Thanks in advance!


4flattires is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 07-15-2014, 11:17 AM   #2
Fierceintent
Focus Enthusiast
 
Fierceintent's Avatar
 
Join Date: Aug 2013
Fan#: 117556
Location: houston, TX
What I Drive: 04 infra red Svt, 03 2.3 red sedan

Posts: 387
Points 463, Level 9
Points: 463, Level: 9 Points: 463, Level: 9 Points: 463, Level: 9
Level Up 26% Completed
Level up: 26% Level up: 26% Level up: 26%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 1 Fierceintent Good Standing Member
Buy-Sell-Trade Rating: (0)
Check for frayed wires at driver door Also trunk. Then have some extra wires ready a splicer n eletric tape. Make sure to have bout half inch to work with so u can twist good connection. Hopefully its just frayed wires.
Fierceintent is offline  
    Reply With Quote
Old 07-19-2014, 11:47 AM   #3
4flattires
Focus Rookie
 
Join Date: Jun 2010
Fan#: 76250
Location: Air-id-zona, AZ
What I Drive: 2007 ST

Posts: 23
FF Reputation: 2 4flattires Good Standing Member
Buy-Sell-Trade Rating: (0)
....
4flattires is offline  
    Reply With Quote
Old 07-19-2014, 01:52 PM   #4
BC_ZX3
DTC P0606
 
BC_ZX3's Avatar
 
Join Date: Jul 2007
Fan#: 48751
Location: Vancouver, BC, Canada
What I Drive: 2001 Red ZX3 Turbo

Posts: 2,904
Points 2,027, Level 27
Points: 2,027, Level: 27 Points: 2,027, Level: 27 Points: 2,027, Level: 27
Level Up 18% Completed
Level up: 18% Level up: 18% Level up: 18%
Forum Activity 3%
Activity: 3% Activity: 3% Activity: 3%
FF Reputation: 86 BC_ZX3 Excellent Standing Member
Buy-Sell-Trade Rating: (3)
I have a 2006 brake light wiring schematic in pdf format. pm me with an e-mail address if you think it'll be relevant. There is a splice and several colour changes in that circuit - grn/red, grn/yel, grn/wht.
BC_ZX3 is offline  
    Reply With Quote
Old 07-19-2014, 05:59 PM   #5
4flattires
Focus Rookie
 
Join Date: Jun 2010
Fan#: 76250
Location: Air-id-zona, AZ
What I Drive: 2007 ST

Posts: 23
FF Reputation: 2 4flattires Good Standing Member
Buy-Sell-Trade Rating: (0)
Thanks BC, its fixed and behind me now.

I'd located the correct schematic and have that in front of me. I tried to delete a prior post, but seems that you can only modify it.

What I had was a working stoplight switch (DVOM validated) and working stoplights when I jumper the female connector at the switch. That means everything works, right? Sadly no. Not when everything is together (and not even mounted to the brake pedal). I've opened up the switch (after ordering a new one) and saw one of two legs that form contacts inside the switch, one was slightly warped. We're talking 10tho deflection. Not much.

I tested that switch a 100 times with the DVOM, even ran a load through the switch. Never once did it not make contact, so replacing it seemed illogical.

Regardless, the new switch did it. I'm headed down the happy road again.
4flattires is offline  
    Reply With Quote
Old 07-19-2014, 10:47 PM   #6
sailor
"Elder"
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 14,514
Points 9,833, Level 66
Points: 9,833, Level: 66 Points: 9,833, Level: 66 Points: 9,833, Level: 66
Level Up 46% Completed
Level up: 46% Level up: 46% Level up: 46%
Forum Activity 99%
Activity: 99% Activity: 99% Activity: 99%
FF Reputation: 70 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Thanks for posting the resolution, that often can help others in the future (and it answers our curiosity as well).

A guess at the most likely fault won out over logic & the most extensive testing you could do this time.

Glad it worked out to a "simple" repair after all your efforts. Intermittent electrical faults are the bane of anyone attempting repair...
__________________
"Rubber Side Down"

S.R. #275
sailor is online now  
    Reply With Quote
Reply

Bookmarks & Social Networks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 12:53 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.