radio nav system wont turn on
radio wont turn on, fused are good, is the radio bad?

In 2001, Lexus introduced the the third generation of their flagship LS sedan. The totally redesigned LS 430 featured a larger engine, a more spacious interior, and a sleeker looking body. The heavily raked windshield and hood also offered a much needed improvement to the LS's overall aerodynamics. The LS interior continued its high-tech evolution, adding options like keyless Lexus SmartAccess, distance-aware cruise control, and Bluetooth capability throughout the third generation. Also notable: in this generation, many expensive luxury packages were divided into individual options, to offer buyers an opportunity to find an LS tailored more to their specific desires. The new 4.3 liter V-8 was again boosted by Variable Valve Timing + intelligence technology, but it did not produce any additional horsepower beyond the previous 290, but torque was increased from 300 to 320 pound feet. The 0 to 60 time was trimmed slightly, down from 6.5 to 6.3 seconds, and the quarter mile mark dipped just below fifteen seconds. The electronically controlled automatic transmission would remain a 5-speed through 2003, and every LS was still only available with rear-wheel-drive. The wheelbase grew by three inches, increasing interior room beyond what even the very large Mercedes S-Class could offer. Lexus had also rethought the LS interior. Heated AND cooled seats were available for the first time, and the redesigned navigation system became DVD-capable. Three wood finishes were now available to complement the rich leather seats and trims. A new Mark Levinson sound system replaced the Nakamichi option, and a convenient touch-screen control was added to the center console.
radio wont turn on, fused are good, is the radio bad?
I reversed the battery & I suppose blew all the fuses. How do I change them.
How i can remove the speed limit in my car? ... it can't go more then 135mph
The engine light was on, I brought my car to the shop to get a free engine check after they checked it they gave me this code P0440, P0441, P0446 they told me to check on www.google.com to find out about these codes.
I switched the batteries in the keys, but it did not help. Any ideas??
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Front side airbags · Rear side curtain airbags
Audio System
6 disc in-dash CD · Premium Brand: Mark Levinson · AM/FM radio
Brakes
ABS: 4-wheel
Comfort Features
Shift knob trim: wood · Steering wheel trim: leather
Convenience Features
Cruise control: adaptive · Dimming rearview mirror: auto-dimming · Memorized settings: driver seat · Multi-function remote: trunk release · Steering wheel: power tilt and telescopic · Sunshade: power rear window
Lights
Exterior entry lights: security approach lamps · Headlights: HID
Mirrors
Exterior mirrors: auto-dimming
Rear Seats
Type: bench
Roof
Moonroof: power
Safety
Parking sensors: rear
Seats
Front seat type: bucket · Heated: front and rear · Upholstery: leather · Ventilated: front
Suspension
Front Spring Type: coil springs · Rear Spring Type: coil springs
Tires and Rims
Wheel type: aluminum alloy · Wheels: chrome
Windows
Front wipers: rain sensing