Power Coming In, But Radio Not Operating; Noise Present, But Am-Fm Not Operating - Toyota Hilux Surf 1993 Owner's Manual

BE–94
Radio
[R] Radio [S] Radio + Tape Player [U] Radio–Tape Player (Built–in Power Amplifier)
[P] Radio–Tape Player (Separate Power Amplifier)
[S][U][P]
Is tape player operating normally?
[R]
[R][S][U][P]
Is there continuity in speaker wire harness?
Yes
Temporarily install another speaker. Functions
OK?
Hissing sound from speaker?
Yes
Radio assembly faulty. Recheck system after repair.
Radio
[R] Radio [S]: Radio + Tape Player [U]: Radio–Tape Player (Built–in Power Amplifier)
[P] Radio–Type Player (Separate Power Amplifier)
[S] [U] [P]
Is tape player operating normally?
[S] [U] [P]
Radio assembly faulty.
BODY ELECTRICAL SYSTEM

POWER COMING IN, BUT RADIO NOT OPERATING

Yes
[R] [S] [U]
Radio faulty.
Radio assembly faulty.
NOISE PRESENT, BUT AM–FM NOT OPERATING
Yes
Hissing sound from
speaker?
– Audio System
Go to No. 17.
Speaker wire harness faulty.
Yes
Speaker faulty.
Power amplifier faulty. Recheck system after
repair.
If radio side faulty
Go to No. 17.
Power amplifier faulty. Recheck system after
repair.
Radio faulty.
Radio assembly faulty.
Radio faulty.
Radio assembly faulty.