Hi,
It sounds like something shorted in the radio itself. Ugh! You have the same kind of luck I have. I've seen the pins get corroded, bend, and then short at the connector, but if they all look good, the problem is the radio.
I don't know if you need them, but here are the directions for the removal and replacement of the radio. The attached pics correlate with the directions.
2008 Subaru Impreza F4-2.5L SOHC
Removal and Replacement
Vehicle Accessories and Optional Equipment Radio, Stereo, and Compact Disc Radio/Stereo Service and Repair Removal and Replacement
REMOVAL AND REPLACEMENT
REMOVAL
1. Disconnect the ground cable from the battery.
2. Remove the center panel.
3. Remove the fitting screws, and slightly pull the audio out from the center console.
Pic 1
4. Disconnect the harness connectors and antenna feeder cord.
5. Remove the audio.
6. Remove the mounting screws and detach the satellite radio unit.
Pic 2
INSTALLATION
Install in the reverse order of removal.
Let me know how you make out and if you have other questions.
Take care,
Joe
Images (Click to make bigger)
Monday, November 9th, 2020 AT 8:40 PM