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Trac control system?

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Old 14 Dec 2010, 08:29 pm
BladeRunner's Avatar
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Default Trac control system?

OK, I have an issue with my trac system. I didn't notice it until we got cold & snow on the ground. When I get wheel slip the green trac light above the odometer flickers on & off quickly and I can hear rapid clicking under the hood, I'm thinking that's the trac trying to lock up...but it can't.

This happened a few times, if I switch it off the clicking stops right away. Now, the switch won't work & doesn't light up. I'm thinking the fuse has blown I just haven't checked it yet. so, is my trac system pooched?
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Old 15 Dec 2010, 06:43 am
quicksilverdon's Avatar
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Default Re: Trac control system?

TRAC and ABS both make a racket and are almost the same thing....
There are speed sensors at the wheels, and the computer compares how fast left wheel is spinning versus right wheel.
TRAC : If one wheel is turning a lot faster than the other wheel, the brake on the faster wheel is applied for a split second, released, then the speeds compared again, and if the "fast " wheel is still too fast, brake applied again... - what you hear is the clacking of the brake on and off rapidly.

ABS comes in when you are stopping - if the speed sensors detect a wheel has locked, it releases the brake on that wheel for a split second...repeats...

In the dash you should always see TRAC if the TRAC is shut off -do you? If so, maybe just the bulb in the switch is burned out.
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Old 15 Dec 2010, 07:01 pm
BladeRunner's Avatar
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Default Re: Trac control system?

Thanks quicksilverdon; So that rapid clicking is normal? Sounds pretty nasty to me, it is a much higher pitch than the ABS..and WAY faster!
I don't see the trac response from the switch..( not lit either) and makes no difference what way it's moved. The bulb in the trac (orange) does still work, I see it when I do the self diagnostic on the cluster.
So, just so I'm clear, the (green) trac light indicator does flicker quickly when it's working normally? Thanks..
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