Re: Common problem on older 9-5s - Saab 9-5 Bulletin Board - Saabnet.com
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So one of mine has done this also. I think there is probably just a backup battery in the radio that can be changed out... It doesn't make much sense that something else magically remembers the code (unless it's an eeprom that fails). Electronics need power and as soon as you disconnect the battery at any age, the radio has no power unless there is a backup battery (it would lose all the presets also which it normally does not). I am assuming it is a similar arrangement to a computer motherboard.
The catch is I need to remove the radio to find it... and I've misplaced my radio tool (actually, I should have 2, but currently have 0!)... so once I figure this out, I will post details... need to do it soon!
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