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Old 05-08-2008, 09:22 PM   #1
2000FordFocus
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Third brake light not working?

For some reason, my third brake light is not working (I have a wagon, is the light located on the hatch).

The L/R brake light works!

There are about 5 light bulbs on the third brake light, all of them are not working at the moment. It doesn't make sense to have all the light burn out light that and if only one light is out, I assume the other light will work~

I have visually inspected all the bulbs and they look ok....

So what is going on? Why wouldn't it work?


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Old 05-08-2008, 09:44 PM   #2
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Check the harness that runs through the black rubber conduit between the hatch and the body. Look for any chaffed or broken wires.
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Old 05-08-2008, 10:16 PM   #3
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Ok, so I took apart the third brake light and use a multi-meter to check if any voltage when the brake are pressed.... Nothing!

So that tells me that no electricity is coming out.

This tells me:

1. The module that control the third brake light might not be working, or

2. The wiring from the bake module to the third brake light is broken within (open circuit)...

Replacing the wiring from the brake module to third brake light can be very diffcult~ Not sure exactly how to unwire it~

So I want to determining if the output of the brake module is working correctly or not....

I will need to know where exactly does this wire start. Does anyone know where I can check this? I can use my multimeter again....
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Old 05-10-2008, 02:30 AM   #4
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Could it be possible that all of the bulbs are wired in series?

It seems very unlikely and a cruddy way to wire a string of light bulbs (christmas tree lights anyone?), but considering it could be a pita to check/replace the wiring, I'd try to eyeball the bulb filaments and see if any are broken.
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Old 05-10-2008, 10:23 AM   #5
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> Could it be possible that all of the bulbs are wired in series?

No.
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Old 05-10-2008, 10:45 AM   #6
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Third brake light

Look at the wiring diagram for the car.
http://members.rennlist.org/warren/focuswiring.pdf
The third brake light is shown on the lower left of the diagram, labeled as high mounted stop lamp.


If your other brake lights are working, the switch is ok.

Check the bulbs, make sure the ground connection is good, and then follow the green/yellow wire. The wiring harness can be accessed through the small square port on the driver side when you open the hatch. Pull the entire side off the car and you can disconnect the plugs and find which wire isn't working properly.
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Old 05-11-2008, 11:57 AM   #7
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I've seen from earlier posts the most common reason was the wires worn out in the rubbery tube between the body and hatch door, I had the exact same problem with no third light, with the MOT due soon I scoured the internet and found this site, and the possible fault, with screwdriver in hand I nipped out for a check, 1, all the bulbs were good, 2, pulled back the rubbery thing and there it was, the green wire was broken and the black on its way out, a quick snip and splice.......just the damn same, it may have cured their problem but I'm now stumped as to what mine could be.
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Old 07-28-2008, 10:38 PM   #8
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Quote:
Originally Posted by Warren914 View Post
Look at the wiring diagram for the car.
http://members.rennlist.org/warren/focuswiring.pdf
The third brake light is shown on the lower left of the diagram, labeled as high mounted stop lamp.


If your other brake lights are working, the switch is ok.

Check the bulbs, make sure the ground connection is good, and then follow the green/yellow wire. The wiring harness can be accessed through the small square port on the driver side when you open the hatch. Pull the entire side off the car and you can disconnect the plugs and find which wire isn't working properly.
Cool diagram warren914. Do you have the wiring diagram for the windshield washer pump too? Thanks!
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Old 07-29-2008, 12:17 AM   #9
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> I will need to know where exactly does this wire start. Does anyone know where I can check this? I can use my multimeter again....

So, did you check the wires between the hatch and the body as suggested. That's typically where the problem lies.
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Old 07-30-2008, 06:26 PM   #10
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open the hatch and the access compartment on the left the harness starts in there
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