Subaru Legacy 2004 Service Manual page 3701

2. Audio System
A: WIRING DIAGRAM
<Ref. to WI-116, WIRING DIAGRAM, Audio System.>
B: INSPECTION
No power coming in. (No display and no sound from speakers)
A specific speaker does not operate.
Audio generates noise with engine running.
AM (MW, LW: Europe only) and FM modes are weak or noisy.
Audio System
Symptom
(1) Check the fuse and power supply for audio.
(2) Check the audio ground.
(3) Remove the audio and repair it.
(1) Check the speaker.
(2) Check the output circuit between audio and speaker.
(1) Check the audio ground.
(2) Check the generator.
(3) Check the ignition coil.
(4) Remove the audio and repair it.
(1) Check the antenna.
(2) Check the antenna amplifier.
(3) Check the noise suppressor.
(4) Check the audio ground.
(5) Remove the audio and repair it.
ET-3
ENTERTAINMENT
Repair order