Thread: GM Nav Disk : 25974486 .. does it exist?
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Old 06-12-09, 05:40 PM
jmmdk5 jmmdk5 is offline
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Re: GM Nav Disk : 25974486 .. does it exist?
I just swapped out the original non nav unit for a OEM (Denso) nav unit and the dvd that came with it is part #25976806...can somebody tell me if this is an older version than the two previoulsy mentioned 4.0 and 4.1C dvd?

Should I look to buy the next version #25974486 4.0? Then do I upgrade to 4.1C #2087425U right after that...being new to all this-is that how this is supposed to work-in chronological, er version order, so to speak???

Thanks!