Brake Lights - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 13 (permalink) Old 03-05-2019, 05:30 PM Thread Starter
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Question Brake Lights

Recently the brake lights in my dash have been coming on. The standard brake light, the ABS light and the message center saying something like "inspect brakes". all come on.

The brakes themselves are working fine. If I simply turn the car off and restart it, everything is fine again.

My question is, could this be a bad (worn) ignition switch issue? I ask because in the summer when it's really, really hot outside my moonroof and power windows don't work sometimes unless I turn the car off and restart it again. I know I need to replace the ignition switch but could this now also be effecting the brake (electrical) circuitry?
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post #2 of 13 (permalink) Old 03-05-2019, 05:58 PM
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More than likely the Bosch ABS controller. It's a common failure across pretty much every car that uses the Bosch unit, my old 2001 Sable included. Drove it for 7.5 years with the light on.
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post #3 of 13 (permalink) Old 03-05-2019, 06:17 PM
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Quote:
Originally Posted by sousa632 View Post
More than likely the Bosch ABS controller. It's a common failure across pretty much every car that uses the Bosch unit, my old 2001 Sable included. Drove it for 7.5 years with the light on.
Cant believe mine still works lol


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post #4 of 13 (permalink) Old 03-05-2019, 07:49 PM Thread Starter
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Question

If the ABS controller was bad, why would simply restarting the car make the lights stay off?

If the controller was bad, shouldn't the ABS lights stay on all the time?
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post #5 of 13 (permalink) Old 03-05-2019, 09:17 PM
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^+1 on suspecting the elec. side, not the hydraulic side of the abs module. May check for codes with an abs capable scan tool. On my scanner, a faulty elec. module will read: Error, unable to connect. That kinda eliminates faulty sensors/tone rings at least for the moment, lol.

Last edited by sheila; 03-05-2019 at 09:27 PM.
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post #6 of 13 (permalink) Old 03-05-2019, 09:50 PM
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Quote:
Originally Posted by sheila View Post
^+1 on suspecting the elec. side, not the hydraulic side of the abs module. May check for codes with an abs capable scan tool. On my scanner, a faulty elec. module will read: Error, unable to connect. That kinda eliminates faulty sensors/tone rings at least for the moment, lol.
Mine had the red bk light and the amber ABS both on. The amber ABS burned out and quit. JY module, note has to have the same (TCS) code if you have traction control option. Real pain to replace. Pic shows special tool needed to remove and replace the Torx screws in a horrible place. There are places that will repair a module for $100. Guess the fail is a common issue, easy to fix if you know what to do. For me finding a low mile Bull with TC was a real lucky find. I took the instrument cluster so I got the amber light to replace mine. You can remove the module and still drive the car.


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post #7 of 13 (permalink) Old 03-06-2019, 06:51 AM
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Does this only happen after a cold start in very cold weather? ABS unit is very sensitive to low crank voltage. When this happens to my 05Tec on a VERY cold morning it is a clue that I need to replace the battery.
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post #8 of 13 (permalink) Old 03-06-2019, 11:42 AM Thread Starter
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Quote:
Originally Posted by Jeff K View Post
Does this only happen after a cold start in very cold weather? ABS unit is very sensitive to low crank voltage. When this happens to my 05Tec on a VERY cold morning it is a clue that I need to replace the battery.
Very interesting Jeff. Thanks for the post.

The temp here now is 18 degrees. A few weeks ago the car sat for a week while I installed a front strut.

When I went to start the car the battery was dead, so I charged it back up and it has been fine since then.

I wrote it off at the time to the car sitting in the cold weather, but I don't believe in coincidences.

Will now pick up a new battery and see what happens.
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post #9 of 13 (permalink) Old 03-09-2019, 07:36 AM
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Think of every time you start the car you are booting up all the systems. Low voltage can corrupt the boot up. Weak battery or poor connections act the same.

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post #10 of 13 (permalink) Old 03-09-2019, 07:57 PM Thread Starter
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Lightbulb

I am now not thinking that this is being caused by the battery (still buying a new battery though).

As I was getting off the freeway, as soon as I touched my brakes the ABS warning lights all came on.

I am starting to think that something happened when the mechanic put my front strut on.
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