FixVault

No. 3 Brake System Warning Light Stay On: Notes

NO. 3 BRAKE SYSTEM WARNING LIGHT STAY DETECTION CONDITION AND POSSIBLE CAUSE

Brake system warning lights stay on 
POSSIBLE CAUSE 
  • Brake fluid amount is low.
  • Parking brake does not release.
  • Parking brake switch or brake fluid level sensor stuck on.
  • Short to ground in following circuit:
    • Between parking brake switch and instrument cluster
    • Between brake fluid level sensor and front body control module (FBCM)
  • No connection at DSC HU/CM connector (When DSC HU/CM connector comes off, ABS warning light, brake system warning light, TCS/DSC indicator light, and TCS OFF indicator light 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, TCS/DSC indicator light, and TCS OFF indicator light illuminate but diagnostic trouble code does not display.)
  • DSC HU/CM does not operate.
  • Front body control module (FBCM) detected malfunction.
  • DSC HU/CM internal malfunction
  • Instrument cluster detected malfunction