Car depreciation - form 4562

Hi, 

How does TT calculate the depreciation amount for a car in the second year of service, if section 179 was used in the first year?

For the second year on form 4562, TT show a depreciable basis of $4489, but under current depreciation only $575.

Worksheet part VIII :MARCS, asset class 5, depreciation method 200HB and MARCS convention HY?

Thanks