I looked up a '99 Camry radio wiring diagram in "Prodemand"
There are 2 diagrams
1st with amplifier
There are 3 fuses shown in it.
Radio 1 / 20 amp left side of engine compartment
Radio 2 / 7.5 amp behind dash, left of column
ECU-IG 15 amp behind dash, left of column
2nd without amplifier
The diagram differs,
The fuses are the same as w/ amplifier and the amperage and locations are the same for the fuses.
Hope this helps
Monday, January 23rd, 2017 AT 6:24 PM