Kia 2004.5 Spectra Service Technical Training page 320

2004.5 Spectra Technology
The customer concern is the defogger in a 2004.5
Spectra will work sometimes, but often won't stay on
long enough to defog the rear window. The customer
says that the element in the rear window barely gets
warm, however the outside mirrors are defogging fine.
Looking at the timing chart. It's stated that T2 is
supposed to be approximately 20 minutes in duration.
But note a few other operational features about this
circuit:
1. If the defogger switch is pressed while the defogger
is ON, the defogger turns OFF.
2. If ALT "L" power is lost, the defogger will turn OFF.
If the customer, believing the defogger isn't working
fast enough, presses the defogger switch before time
is up, he will actually turn it OFF. Verify that the
customer does not impatiently press the defogger
switch before the unit has a chance to work.
If there is actually a problem with the defogger, look
for a reason that power to the rear window defogger
is intermittent. Note that the outside mirrors, which
are in the same circuit, are not affected. Such a
symptom indicates power could be lost on either side
of the defogger grid.
Refer to Kia Service Information System (KSIS) for
diagnostic procedures and specifications.
Body Electrical
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