4WD Service warning

[AcesHighCS]

Hi........I'm AcesHighCS,
I have a 99 BLAZER LS. I bought it last year and it had 66,000 KM on it. Last month the 4WD Service warning light came on. The owners manual is useless, so I was wondering if anyone has come across this. I'd like to know before I take it in to the shop.
Thanks for your time.

Regards,
AcesHighCS

[extreme gmc]

welcome to the site, first off. secondly, i would get that looked at imeadately, it could be nothin, but it also could be major. yoiu need to go to the zone and have the code read.
thanx
Charlie

[blazen]

http://img202.echo.cx/img202/1226/brandnewmember1jh.png
welcome to sic....post away

and yeah i know around here autozone checks codes for free. so you should just go it wount hurt anything so why not.