rather than pay the inflated shipping cost from gmpartsdirect.com, I'm just getting mine at a local dealer. The part number (15792651) does correlate with the NAV DVD. I'll be picking it up this afternoon.
gmpartsdirect.com probably has a lower price but with their quoted shipping times, I am not a huge fan. I'm used to getting stuff from a wholesale BMW dealer in three days (UPS ground). Plus they have a real phone number that you can call and get real people to talk to that will take your order. Does anybody know of a GM dealer that does this: i.e. undercuts other GM dealerships with close to wholesale prices, stocks stuff, and ships it UPS Ground so you can get it in a couple of days?????
DrG - got the dealer to fix the "service 4wd" error. I'll let you know what the new disc does. Face it: all non-mission-critical software is buggy. The NAV system goes for "a loop" occasionally where you a wondering what the hell it is doing. I hope the 4.1 version is a little snappier.
Greenhummer.
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