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Defogger Timer

Once ALT "L" is ON, if the defogger is switched ON, the defogger will stay ON for 20 minutes duration.
If defogger switch is pressed again (see Step 1), or if ignition is switched OFF, the defogger will shut OFF.

Fig 1: Illustrating Defogger Timer Function Diagram
Courtesy of KIA MOTORS AMERICA, INC.