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Blind Spot Detector Activates

1100 Views 4 Replies 2 Participants Last post by  Tip Of The Spear
I know this has been discussed before but I'm not sure if there was ever a resolution to the issue. Yesterday for the first time my driver's side blind spot detector activated when there was no vehicle near me. It would go out and then come back on randomly. When it is off and a vehicle approaches me it seems to work like it should. But it's frustrating when it is on and it shouldn't be because you lose the value of that feature. Haven't called the dealer yet but wondering if anyone else had the issue and determined the cause. Mine is a 2019 Blazer.
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First, I would direct you to your owner's manual to educate yourself on this (I believe it's on or around page 236). There is quite a bit of info in the manual that can help you better understand the LCA (Lane Change Alert) system. I won't go into each factor that can affect the LCA simply because there are many factors. However, the first thing we all need to know is that we need to be sure our LCA button in our "Vehicle Settings" menu is enabled so the LCA can function. It seems yours is enabled because you are saying that it is intermittently alerting you. This doesn't mean it's malfunctioning, but once you've read the part in the owner's manual about the LCA, then you need to think about your personal conditions around you and if any of what the manual says applies to you. Considering the sensors on your bumpers are inputting the feedback to the mirrors, always be sure the sensors are clean and not covered up by road debris. Now, don't mistake the LDA/LKA (Lane Departure Alert/Lane Keep Alert) for the LCA. Those are two different features that rely on feedback from two different places on the vehicle. The LDA/LKA feedback comes from a camera sensor ahead of the rearview mirror on the windshield. To engage that feature, you depress the button on your center console located at the mouse wheel, if applicable.

After you're certain you've done all you can do and still feel there may be an issue, you'll need to take it in and have the dealer look at it. The dealer is going to point you to the manual and make sure you understand the mitigating factors that can affect the LCA, so be prepared to have that conversation. If you can go in there and tell them you have already read the manual about the LCA, and you are aware of all the circumstances that can trigger the LCA for false positives, then you might be able to cut through a bunch of the minutia.

Good luck and let us know what you find out.
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Thank you for your reply. I'll check things out. This is my Wisconsin car and we do fly back to Florida a week from today. We will be there until mid-May so I may not get to look at the Blazer before we return. And maybe it won't be an issue then because the Blazer will be cleaned before I park it for the remainder of the winter. Right now it's 9 below zero with blowing snow so I'm not anxious to do anything with the car for now even with it in the garage. If the new car market opens up by the time we return to Wisconsin I'll be in the market for a new one. Here's hoping.
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Interesting that I have been driving lots of miles running around for the holidays the past 3 days and the blind spot detector is working perfectly as it should. I didn't do anything since I first had the issue. Go figure.
Did you read the manual and see the part about it picking up other objects if close enough to them?
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