Kia Optima: Check FusesA blade type fuse test taps provided to allow checking the fuse itself without removing if from the fuse box. The fuse is good if the test lamp lights up when one lead is connected to the test taps (one at a time) and the other lead is grounded. (Turn the ignition switch so that the fuse circuit becomes operative)

Checking Cables And Wires
Servicing The Electrical SystemReplacement (With EPB)
Rear brake pads
1.
Remove the rear wheel & tire.
2.
Connect the GDS to the data link
connector located underneath the dash panel.
3.
Ignition "ON& ...
Inspection
Test the horn by connecting battery voltage to the 1 terminal and ground the 2 terminal.
The horn should make a sound. If the horn fails to make a sound, replace it.
Horn Relay Inspection
1.
...
Removal and Installation
1.
Disconnect the terminals from the battery.
Tightening torque
:(+) terminal (A) : 7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m,
5.8 ~ 7.2lb-ft)
(-) terminal (B) : 4.0 ...