Check the power source circuit

1. Disconnect the connector from the ESC control module.
2. Turn the ignition switch ON, measure the voltage between terminal 29 of the ESC control module harness side connector and body ground.

Specification  approximately B+

3. Is the voltage within specification?

YES  Check the ground circuit.

NO  Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ESC control module. Repair if necessary.

Fig 1: Measuring Voltage Between Terminal 29 Of ESC Control Module Harness Side Connector & Body Ground

Courtesy of HYUNDAI MOTOR CO.