Check the Power Source of ABS Control Module

Disconnect the connector from the ABS control module.
Turn the ignition switch ON, measure the voltage between terminal 29 of the ABS control module harness side connector and body ground.
Specification: approximately B+
Is voltage within specification?
YES

Check for poor ground.

NO

Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ABS control module. Rectify if necessary.

Fig 1: Checking ABS Control Module Power Source
Courtesy of HYUNDAI MOTOR AMERICA