My 2000 Lexus rx300 has a amplifier away from the factory radio. I checked under passages seat that's where my 5 sub is. Some mention that is between my spare tire and back seat under carpet?

SOURCE: Garage door opener on 2000 Lexus RX300

Check out the Homelink Website. I found instructions for my wife's GS300 there. I haven't tried it yet, so I'm not 100% sure this will work.

SOURCE: 2004 Nissan Sentra, Spare Tire Cover?

call around to your local junkyards and im sure you will find it and probably pretty cheap too

SOURCE: need to disable passenger airbag in lexus 2003 rx300

if you open the passanger door there is a slot for the key. you will need to press the button on the circular key to pull out the real key.  Don't do that!The airbag is a safety device which can save the life of the passenger in case of an accident!However,as the Corvette is a 2-seat car,if you are talking about a child,I strongly recommend you to install an aftermarket Passenger Airbag ON-OFF switch.That is possible even for older car models

SOURCE: replace side marker light on lexus rx300

Remove 3 - 4 screws on fender cover close to side marker light. Pull fender cover out a bit for you to use your other hand to reach side marker light. By twisting on one direction and here you go the light out. Replace new bulb and replace everything on reverse order.

SOURCE: Removing the Radio for Lexus Rx300

take the woodgrain cover off around shifter, it pops off. next pull out the small panel just below the radio, pull it straight out towards you, set it aside. there are 4 bolts holding the radio in, you will need a light to see the back 2. remove these bolts and carefully pull radio straight out.