I'm new to this site, this is my first post.
I had similar problem last year.
CD stuck in the track, wouldn't eject, "ERR 2", etc.
I have a 2001 Pathfinder, I have the Bose system with the in-dash CD changer. I did a lot of research to gather the information written below.
The unit is really made by Clarion, the CD changer is a PN-2302.
Unless you spring for a completely new system to replace the entire Bose system.
You have 3 choices:
1. Replace it with a new one. You can find compatible Nissan "Bose" units on ebay, but you should verify with the seller that the wire harnesses match.
2. Send it to a specialist to fix, like http://www.johnson-electronic.com
3. Fix it yourself. (NOT RECOMMENDED UNLESS YOU HAVE ELECTRONICS EXPERIENCE). There are many fragile components/flex-wiring inside the unit that can get permanently damaged.
I opted for #3.
You can find replacement parts & a service manual for the unit from Pacific Coast Parts www.pacparts.com
I troubleshooted my unit, to find out why it got stuck. I re-assembled it partially then applied power to the unit. I did some tests with blanks CDs. I eventually isolated the problem to two plastic gears on the spinner mechanism that engages/disengages the CD from the spinner was worn. This left the CD floating above the spinner, and it never seated properly, thus leaving it stuck when I tried to play it or eject it. This may/or may not be the cause of your problem, but it was mine, so I thought I'd share it. These plastic gears spin every time you switch/eject CDs so it gets a lot of use. I was able to identify these gears on the diagram I bought from Pacific Coast Parts, and ordered them from the same company. Replaced the parts, put everything back together, and now my cd changer works again.
Total cost of parts including the manual ~$40 bucks.
But labor-wise. From Start to Finish, It took me every other weekend for 3 months to complete the fix. Lots of trial/error and troubleshooting.
If I could do it all over again, I probably would look on ebay for a replacement.
Sorry for the lengthy post, I hope this helps you make your decision.