Hyundai Tiburon 2003 Workshop Manual page 344

Communication with Hi-Scan (Pro) is not possible.
(Communication with ABS only is not possible.)
When communication with Hi-Scan (Pro) is not possible, the cause may
be probably an open circuit in the HECU power circuit or an open circuit in
the diagnosis output circuit.
Inspection Procedure 3
When ignition key is turned "ON" (engine OFF), the ABS warning
lamp does not illuminate
When current flows in the HECU, the ABS relay turns from on to off as the
initial check. The ABS warning lamp will illuminate when the ABS relay is
off even if there is a problem with the circuit between the ABS warning
lamp and the HECU.
Therefore, if the lamp does not illuminate, the cause may be an open
circuit in the lamp power supply circuit, a blown bulb, an open circuit in
both the circuits between the ABS warning lamp and the HECU, and in
the circuit between the ABS warning lamp and the ABS relay.
http://www.hmaservice.com/viewer/content.asp?IsPrint=true&imgnum=1&print_title...
Probable cause
• Faulty power source circuit
• Faulty diagnosis line
• Faulty HECU
Probable cause
• Blown fuse
• Burnt out ABS warning lamp bulb
• Faulty ABS warning lamp circuit
• Faulty HECU
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24.04.2008