For those of you that own an 06 Sonata GLS and plan to install an
stereo, be advised that scosche is sending wire harnesses
that have an inline
circuit board. the circuit board is covered by a
little black plastic cover.
The circuit board contains some
capacitors and some resistors that will severely
degrade the audio
quality. You will need to cut all the wires attached to the
board and simply go wire for wire, attaching the wires to the
corresponding color. This will allow the amp in your head unit to
speakers. There is a harness that scoshe makes that does
not have the in line
circuit board but I am not certain of the model
number. I cannot claim to have
figured this out myself. Another
reader of this sight, John, figured this out
as we were both having
the same problem with poor audio quality. I thought this
helpful to anyone else attempting an install in the near future.
dash looks great with the aftermarket head unit installed. I
else to do the same.