Buttons

I just bought a 97 sc300 at 140k miles and love it. It's the Diamond White Pearl kinda color. I believe that's the name. The problems with the car when I bought it. 1. Cigarette Lighter wasn't working 2. Tire vibration 3. Paint Chipping on inside of the passenger door. 4. Exactly 5 itty bitty rock chips. 5. 12 disc CD player says Error 6. Middle Sub doesn't seem to work. 7. Memory Seats not working Other than that the car seemed fine. 1. Cigarette Lighter replacement cost me around $30 2. Power Steering Fluid was extremely low 3 & 4. I bought touch up paint from Lexus. $16 5. I NEED TO KNOW WHAT'S WRONG 6. I NEED TO KNOW WHAT'S WRONG. 7. I found out the car needs to be on and in park. You press the button Set and 1 at the same time until you hear beep. So do I need to get a new sub, new amp, or headunit? I don't want to replace the speakers because the Front and Rear regular ones seem to play very nice. I want to know why the CD player has an error. Toyota was wanting to charge me $100 JUST TO LOOK AT THE CAR... oh sigh Best Buy told me the only way to replace something was to replace everything and I really don't want to do that. I'm just looking for an easy fix since the speakers in it already sound so good.