I have 2000 Tundra. It has the stock Cassette/CD player but the amplifier is missing. I have purchased a replacement but don't know how to install it. Hoping to find the instructions online somehwere (how to get access, etc).
Some radios have the AMP built into them.
If your amp is a seperate unit then it is mounted behind the radio.
See pic for radio removal instructions, the amp is bolted rigt behind the radio.
Hope this helps