This switch is mounted on the pedal assembly and is used to send the status of the brake pedal to the HECU. There are two separate switches in the switch housing. The Brake Switch is normally closed while the Brake Light Switch is normally open.
The HECU checks for open or shorted circuits of the brake switch.
If an error is present, the warning lamp will illuminate.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Open circuit monitoring | 1. Open circuit in brake switch line 2. Faulty brake light switch 3. Faulty input stage in HECU |
Enable Conditions |
•
If both BLS(brake lamp switch) and BS(brake switch) have a same state and MCP (Master Cylinder Pressure) >20bar for 500ms.
•
Outside an ABS/ESP control, and after normal operation of MCP, If the pressure sensor signal is higher than 20bar and BLS is low for 3sec.
•
If the BLS/BS changed more than 40times and MCP>20bar for 5sec.
•
While Vehicle speed > 10km/h, TPS>5%, MCP<7bar, if BLS is high over 1min. | |
Fail Safe |
•
Inhibit the ESP/DBC control and allow the ABS/EBD control.
•
The ESP/DBC warning lamp is activated. |
Brake Light Switch | Voltage Range of "High" | Voltage Range of "Low" |
7.0V ~ 16.0V | 0V ~ 3V |
