Unless the instrument lights fuse is blown, turn the odo reset button to adjust the instrument light brightness. This information is listed in your owner's manual. Don't have one, get one. Dealer, salvage yard, e-bay, Google Search.
The engine relay on my 2001 Hyundai Accent 1.6L is under the dash on the driver's side.
The 1996 Hyundai Accent OBD 2 port is on lower edge of dash next to kick panel
The 2000 Hyundai Accent OBD 2 port is on rear of lower edge of dash; right of hood release
under the dash, drivers side
a scewdriver or hammer
remove the dash board panel around it and take it out
The 1997 Hyundai Accent OBD 2 port is on lower edge of dash next to kick panel
in the exause right before the bolts the link it together about where your dash is
just above the fuse box behind the dash at the driver footwell
M21 IN FLASHER BOX located just above the fuse box on the drivers side. Easy to access by popping out the plastic piece the holds the dash lights dimmer. M21 is the big relay on the lower right. M21 IN FLASHER BOX PASS SIDE
where is the ecu for a 2002 Hyundai Accent?: this computer is located under the dash, left side. can't miss it, just look under the dash. bolted in with 6mm bolts, use 10mm socket to remove. Make sure you disconnect battery first if you decide to remove it or replace it.!
The 2005 Hyundai Accdent OBD 2 port is on lower left dash next to driver side kick panel