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1st Generation Chevrolet (Chevy) Trailblazer, based on the GMT360 platform.

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ABS light is on without any accident

What is the reason? How to fix it?

Update (03/20/23)

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Actually the ABS and these lights are on now

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@drnisreena27515, there are usually separate lights for the airbag vs. ABS systems, although I admit I'm not that familiar with your particular vehicle.

The ABS system light can be turned on for several reasons; the most common is failure of one of the wheel speed sensors.

An airbag light can also have multiple causes; I accidentally turned it on on my wife's Volvo when I had the dash open to replace some lights. I had unplugged the airbag as the instructions indicated, but before I buttoned everything back up I turned the car on to check that the bulbs worked. Unfortunately since I hadn't plugged the airbag back in, the airbag system saw that there was no airbag connected and turned the light on. It wouldn't go off even after I reconnected the airbag and I ended up having to take it to a shop to have the light turned off.

Anyway, there are frequently connectors that detect when the seatbelt is fastened and someone is sitting in a seat that, when they fail, can turn on the airbag light as well.

You may be able to get some clues by scanning the OBD-II system in the car, but the ABS/Airbag systems are often proprietary and may require specialized tools to read out the information as to why the light has been turned on. Most reputable auto shops can scan that for you (usually for a fee) and tell you why the light is on. A general OBD-II scan can be had for free, at least here in the United States, at most auto parts stores.

Good luck; let us know what you find.

UPDATE

Okay, of the lights that are on, I don't believe any of them are related to the airbag system, so it seems we can drop that as a possible issue, at least for now.

The existing lights seem to be related the the ABS, Braking and traction control system, all of which are interrelated. So my original premise still holds that the most likely (but certainly not the only) cause would be a broken or malfunctioning wheel speed sensor.

I see that the Malfunction Indicator Light (MIL, AKA the "Check Engine" light) is on, which says there is information to be read from the On-Board Diagnostics (OBD-II) port. That information may well tell you exactly what's wrong, or at least point you in the direction of where the problem lies.

You can pick up an OBD-II scanner that connects to a free app on your phone via bluetooth for under $10 USD, or as I mentioned, most auto parts stores here in the US will scan your car for free and give you the codes.

So I'd suggest your next step should be to get your codes then come back here and edit your post to include them. From there we can figure out what your next step should be.

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