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1979-2004 V6 Mustang Tech Discussions

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Unread 02-02-2010   #1 (permalink)
ginnguice is offline Rookie


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Default 2002 Mustang Brake Light and Shift Interlock System not working

I have a 2002 Mustang V6. My rear brake lights and shift lock actuator are not working. I checked the voltage to the brake switch (light green w/red stripe) and it was getting voltage. Now here's the real problem - there's no voltage when the brake pedal is pressed. I replaced the switch (one I bought from Auto Zone) and there is still no voltage getting to the red wire w/light green stripe when the brake pedal is pressed. I looked in the back of the Haynes manual and checked the wiring and fuses in the brake circuit and everything checks out ok. I unhooked the brake switch connector and used a jumper wire to see if the rear brake lights would come on and activate the shift lock actuator-still nothing! Yesterday I replaced the brake switch connector, thinking maybe a connection had burned or came loose-still nothing! Checked for continuity on the brake switch(when the pedal is pressed)-YES! BTW I used a test light and multimeter to confirm that there was no voltage. Did I miss anything?

Last edited by EagleAutosports; 02-02-2010 at 02:02 PM. Reason: Merged 2 posts
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Unread 02-02-2010   #2 (permalink)
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Default power

I am not real familiar with that system. So I may not be of much help. But brake lights are usually direct power. (meaning from the fuse box) Are you getting power to the switch? One of the wires coming to the switch should be hot all the time. I am sorry if you already checked that. But that is where I would start.
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Unread 02-02-2010   #3 (permalink)
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Default

I'm no expert but to me it sounds like the problem is originating from before the brake light switch.. so logically it would be a loose/broken wire or something like a fuse
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Unread 06-01-2012   #4 (permalink)
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Default

Man I have the same problem, my wires keep burning up, so I have to keep splicing new wire, or else the brake lights won't come on, so then I can't shift out of park. It works for a few months then the wires give out and melt. Everytime i press the brake pedal the wires start getting hot at the spliced connection. I put a lot of elec. tape maybe it'll last longer. What do I have to do to permanently fix the problem right? The red and green striped wires are almost already running out on top of the brake pedal. It sux cuz I don't know how I'm going to keep driving my mustang anymore once it does it again!
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Unread 06-01-2012   #5 (permalink)
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Quote:
Originally Posted by abry0014 View Post
Man I have the same problem, my wires keep burning up, so I have to keep splicing new wire, or else the brake lights won't come on, so then I can't shift out of park. It works for a few months then the wires give out and melt. Everytime i press the brake pedal the wires start getting hot at the spliced connection. I put a lot of elec. tape maybe it'll last longer. What do I have to do to permanently fix the problem right? The red and green striped wires are almost already running out on top of the brake pedal. It sux cuz I don't know how I'm going to keep driving my mustang anymore once it does it again!
Just wondering if someone has replaced fuse F2.33 with something larger than a 15 amp fuse. That would explain why the wire gets hot and melts instead of the fuse blowing.

Do you want to fix this? Find where in the brake circuit there's a fault or short.

How about the brake light bulbs? Are any brighter than the rest? Start there.

Or disconnect all of the brake lights and test. Re-install one at a time until the CORRECT 15 amp fuse F2.33 blows.

99-04 fuse panel layout:
http://www.allfordmustangs.com/forum...ml#post2669271
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