Check The Power Source Circuit

Disconnect the connector from the ABS control module.
Turn the ignition switch ON, measure the voltage between terminal 4 of the ABS control module harness side connector and body ground.
Specification : approximately B+

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 ABS control module. Repair if necessary.
  
  Fig 1: Measuring Voltage Between Terminal 4
  Courtesy of KIA MOTORS AMERICA, INC.