The EPB is the acronym for Electric Parking Brake system. Instead of using pedal or lever, using switch can apply parking brake. Drive controls switch ? switch signal to ECU ? ECU activate actuator ? parking brake Apply/Release. When EPB switch is pulled, parking brake gets Applied. When EPB switch is pushed down, parking brake is released.
EPB ECU sets DTC if EPB switch circuit or wiring has problem.
Item
Detecting Condition
Possible Cause
DTC Strategy
Switch signal monitoring
EPB switch cirucit open/short circuit
Faulty EPB switch
Driver abnormal switch control (too much activation, pull or push for long time or slowly push/pull switch)
Enable conditions
EPB is awake, battery voltage is in normal range
Threshold value
Switch signal is abnormal for more than 2seconds
Switch is disconnected for more than 2seconds
Switch signal is apply or relase for more than 90 seconds (For apply, vehicle has to be stationary)
Fail Safe
EPB function using switch inhibited