Rear Window Defogger Timer: Inspection

While operating the components/check whether the operations are normal (including outside mirror heater). See Fig 1.

1. Once ALT "LH is ON, if the defogger is switched ON, the defogger will stay ON for 20 minutes duration.
2. If defogger switch is pressed again (see step  1), or if ignition is switched OFF, the defogger will shut OFF.
   Fig 1: Identifying Signal Waveform

   Courtesy of KIA MOTORS AMERICA, INC.