Connect GDS to Data Link Connector(DLC).
Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
If DTC status is current condition, go to following procedure. And, if it is histroy DTC, erase it and check that MIL is ON again.
Erase DTC C1612.
Recheck EPB system. If C1612 is still active DTC, diagnose engine TCU related item and CAN line.