No. 3 Brake System Warning Light Stay On: Notes
NO. 3 BRAKE SYSTEM WARNING LIGHT STAY ON (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) POSSIBLE CAUSE
| 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 electronically controlled brake unit connector (When electronically controlled brake unit connector comes off, ABS warning light, brake system warning light, DSC indicator light, and DSC OFF indicator light illuminate.)
- Electronically controlled brake unit detected malfunction. (Input and output device malfunction)
- Electronically controlled brake unit detects low voltage in power supply.
- Electronically controlled brake unit ground malfunction (When electronically controlled brake unit ground is not securely connected, ABS warning light, brake system warning light, DSC indicator light, and DSC OFF indicator light illuminate but diagnostic trouble code does not display.)
- Electronically controlled brake unit does not operate.
- Electronically controlled brake unit internal malfunction
- Instrument cluster detected malfunction
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 Courtesy of MAZDA MOTORS CORP.
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