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Home >> Mazda >> 2020 >> CX-30 Base, AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Symptom Troubleshooting - Dynamic Stability Control (DSC) >> Brake System Warning Light Stay On >> Notes
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Brake System Warning Light Stay On: Notes

Troubleshooting item Brake system warning lights stay on
Possible cause
  • Brake fluid amount is low.
  • Brake fluid level sensor stuck on.
  • Short to ground in fluid level sensor signal circuit.
  • No connection at DSC HU/CM connector (When DSC HU/CM connector comes off, ABS warning light, brake system warning light, DSC indicator light, and TCS OFF indicator light (without Off-Road Traction Assist)/Off-road traction assist indicator light (with Off-Road Traction Assist) illuminate.)
  • DSC HU/CM detected malfunction. (Input and output device malfunction)
  • DSC HU/CM detects low voltage in power supply.
  • DSC HU/CM ground malfunction (When DSC HU/CM ground is not securely connected, ABS warning light, brake system warning light, DSC indicator light, and TCS OFF indicator light (without Off-Road Traction Assist)/Off-road traction assist indicator light (with Off-Road Traction Assist) illuminate but diagnostic trouble code does not display.)
  • DSC HU/CM does not operate.
  • DSC HU/CM internal malfunction
  • Instrument cluster detected malfunction
G13558258Courtesy of MAZDA MOTORS CORP.