My 2005 Subaru Outback's AM radio is no longer working. The antenna is inside the rear glass of back door. What could be the problem?

This often doesn't work because the radio is monitored by the Body Control Module on the 5 volt computer network.


Wiring

Subaru Legacy, Outback, Baja (1993-2008) Car Stereo ...

Pinout Guide https://pinoutguide.com > ... > Subaru pinouts
Oct 22, 2019 - Pin #. Function. Legacy / Outback / Baja Factory Radio Connector Wire Color (wires go to car's Speakers, etc.) Subaru After-market Harness ...

2000 Subaru Impreza Car Stereo Wire Colors and Locations

the12volt.com https://www.the12volt.com > installbay > stereodetail
2000 Subaru Impreza Stereo Wiring ; Left Front (-), Green/Black ; Right Front (+), Red/Yellow ; Right Front (-), White/Black ; Rear Speakers, 6 1/2" Rear Doors.

Installation kits

https://www.google.com/search?q=2000+subaru+outback+stereo+installation+kit

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The am antenna is in the radio..it cud b worn or the tuners may hav burnt. Its an old radio. Junkyards hav them cheap n workable cause theyr wreckcars

Dealer should have recommended replacing the entire unit. There is a fault in it. Changing the antenna is not going to help.

check fuses and plug connectors in one more time
check antennae connection
make sure it is well grounded

I had the same problem. I found that every wire in the harness of the back hatch was broken. I spliced them back together and everything works.

Check this information about 2005 Subaru Outback Wagon Car Stereo Wire Guide:

Car Radio Battery Constant 12v+ Wire: Blue/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Red
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Brown/White
Left Front Speaker Negative Wire (-): Green/Black
Right Front Speaker Positive Wire (+): Red/Yellow
Right Front Speaker Negative Wire (-): White/Black
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Red
Left Rear Speaker Negative Wire (-): Red/Green
Right Rear Speaker Positive Wire (+): Blue/Green

The 2005 Subaru Outback Wagon radio wire color information above is updated as it is submitted by the Modified Life community.

Hope helps (remeber to rated ans leave an testimoanial about this free answer).

2004 Subaru Outback Wagon Radio Stereo Wiring Diagram
Radio Battery Constant 12v+ Wire: Blue/Yellow
Radio Accessory Switched 12v+ Wire: Yellow/Red
Radio Ground Wire: Black
Radio Illumination Wire: Green
Stereo Dimmer Wire: N/A
Stereo Antenna Trigger: N/A
Stereo Amp Trigger Wire: N/A
Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Brown/White
Left Front Speaker Negative Wire (-): Green/Black
Right Front Speaker Positive Wire (+): Red/Yellow
Right Front Speaker Negative Wire (-): White/Black
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Red
Left Rear Speaker Negative Wire (-): Red/Green
Right Rear Speaker Positive Wire (+): Blue/Green
Right Rear Speaker Negative Wire (-): Red

inspect antenna connection at rear gate wiring harness passthru,if this car is a wagon the rubber boot on drivers side rear gate holds the harness from getting pinched,remove this boot and inspect harness carefully you should find broken wires,repair the wires,then enjoy your a.m stations again

The switches in Subarus are made by Nissan believe it or not. They are not interchangeable. Anyway, I suspect you have a bad window switch. You can pickup the whole bank of swiches or replace just the one. Do a search on ebay for your part.
Has this car had body damage on the driver's door? You could have a cut wire inside the door.

Check the antenna connections and the cable for damage.