The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2021 Santa Fe Calligraphy: Blind Spot Monitor warning light on constantly

0

Christine P. · rep 0 · May 22, 3:01 AM · 1 replies · solved · Question

Vehicle: 2021 Hyundai Santa Fe Calligraphy

Hi all,

My 2021 Hyundai Santa Fe Calligraphy has developed an annoying issue. The Blind Spot Monitor (BSM) warning light on the dash has been on constantly for the past few days, and the system isn't working. It usually works perfectly, but now it just shows the warning and doesn't detect anything.

I've tried restarting the car multiple times, and even checked if there's any dirt or obstruction on the rear bumper where the sensors are, but everything looks clean. Is this a common problem with these models, or could it be something more serious?

Any advice would be appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:01 AM

0

ClearTheCode admin answer:

It's frustrating when advanced driver-assistance systems (ADAS) like the Blind Spot Monitor (BSM) malfunction. A constant BSM warning light on your 2021 Hyundai Santa Fe Calligraphy indicates the system has detected a fault and is likely disabled.

Here's a breakdown of potential causes and steps you can take:

  1. Sensor Obstruction/Damage: While you've checked for dirt, sometimes even a minor scuff or a very thin layer of grime (like road salt residue) can interfere with the radar sensors located in the rear bumper corners. Ensure they are perfectly clean and free of any physical damage.
  2. Environmental Factors: Heavy rain, snow, or ice can temporarily block the sensors. If the issue persists after conditions clear, it's likely not environmental.
  3. Software Glitch: Sometimes, a simple software hiccup can cause ADAS systems to throw a false warning. Try disconnecting the negative battery terminal for 10-15 minutes (ensure you have your radio codes if applicable, though most modern Hyundais retain them) to perform a hard reset of the vehicle's electronics.
  4. Wiring or Connector Issue: The sensors rely on a stable electrical connection. A loose or corroded connector, or damaged wiring to one of the BSM radar units, could cause a system failure.
  5. Sensor Malfunction: The radar sensor itself could be faulty. These are complex electronic components that can fail over time.

When to See a Shop: If cleaning the sensors and performing a battery reset doesn't resolve the issue, it's highly recommended to take your Santa Fe to a Hyundai dealership or a reputable independent shop specializing in ADAS systems. They have specialized diagnostic tools that can:

  • Read specific ADAS-related diagnostic trouble codes (DTCs) that generic OBD-II scanners might miss.
  • Perform sensor calibration, which is often required if a sensor has been replaced or if the system has lost its alignment.
  • Test the integrity of the wiring and the functionality of the radar sensors themselves.

Ignoring a BSM warning means you're driving without a key safety feature, so prompt diagnosis is important.

Menu

Help & account