Check The Power Source Circuit

Disconnect the connector from the ABS control module.
Turn the ignition switch ON, measure the voltage between terminal 3 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 3 Of ABS Control Module Harness Side Connector And Body Ground
Courtesy of KIA MOTORS AMERICA, INC.