my clock is out after I unplugged the old head unit, and it's still out after I installed the new head unit, i checked out all fuses, they seems fine.... help me..............

 

The clock isn't on the stereo harness. There's a physical plug behind it. Do a search for "swap cluster" in the Do-It-Yourself forum and it will show you where the plug is for it. Sounds to me like someone took your dash apart and left it unplugged.