Display on my DRX6275GB (1997 Subaru) is very dull. How can I brighten it up? Thanks

Try using a CD Lens Cleaner disc on it, but the link suggests it is a disc transport issue. That would need a Clarion Service Centre. Clarion make it branded as Macintosh.

https://www.google.com/search?q=Subaru+Liberty+won%27t+read+CDs+Error+6

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It sounds like you are trying to install a Clarion PF3494 head unit into a 2001 Subaru Outback and you have run into compatibility issues. The Aerpro APP8CLA4 adapter you bought does not seem to fit your head unit.
In this situation, you have a few options:

1. Look for a custom installation kit: Some car audio retailers offer custom installation kits specifically designed for your make and model of car. You may be able to find a kit that includes the necessary wiring harness and adapter for the Clarion PF3494.
2. Check the Clarion website: Clarion may have information on their website about the wiring harness and adapter required for your specific head unit and vehicle.
3. Contact a professional installer: A professional car audio installer may be able to help you find the correct wiring harness and adapter for your head unit and vehicle, or they may be able to custom build the necessary wiring for you.

I recommend contacting a professional installer if you do not feel confident wiring the plugs yourself, as incorrect wiring can cause damage to your head unit and vehicle.
If you can provide the specific information about the pins and connections of the Clarion PF3494, I may be able to assist you further.

check the fuse in the dash for the 'radio/audio' 15A and under the hood its the 'clock' 10A fuse

2007 Outback Wagon - radio controls freeze - Subaru Outback ...

www.subaruoutback.org > ... > Audio, Video, Security, & Navigation

Mar 22, 2012 - Have a 2007 Outbak Wagon with radio controls that freeze for no reason. It freezes and fixes itself randomly. What I mean by freeze is: can't ... Any luck fixing poor radio reception? - Subaru Outback - Subaru ...
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Subaru radio problems 2008 outback - YouTube

? 0:09
https://www.youtube.com/watch?v=N9W78_ZlBdc
Oct 29, 2012 - Uploaded by NRHTX
Subaru radio problems 2008 outback. NRHTX ... Up next. 2007 Subaru Outback Suspension Noise Repair -EricTheCarGuy - Duration: 23:04.

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If the radio code is entered too many times without success the radio will lock up. You will be able to retry the code after a period of time. Some are 30 minutes of waiting and others may take longer.

i had the same problem on my sube, i removed the starter and took it apart and cleaned and lubed it and it works fine now.

short circuit in the switches somewhere

no way without the radio number,only ones that have this on record are the dealers.Why dint someone suggest using a boost box on battery cables before it was changed .

The faceplate for the radio HVAC is broken. Check your local Subaru dealer for replacement

These cars are very hard to find parts for and most of them don't interchange .