Toyota Camry Manual page 444

Radio
Check if RADIO fuse is OK?
Is ACC applied to radio ?
Yes
Check if DOME fuse is OK?
Is +B applied to radio?
Yes
Check if GND (wire harness side) to radio is OK?
Radio assembly faulty.
BODY ELECTRICAL SYSTEM
RADIO NOT OPERATING WHEN POWER SWITCH
TURNED TO 'ON'
– AUDIO SYSTEM
Replace fuse.
ACC wire harness faulty.
Replace fuse.
+ B wire harness faulty.
G N D .faulty.
BE–125