Warning Lights
 

Hi, I'm new on here, just bought a 2001 Blazer LT this week.
When I picked it up it had the airbag light on, no big deal I thought, but since driving it a week I also have the engine management light on constantly and also the service 4WD light comes on after 10-15 km.
The 4WD light goes off when the vehicles cooled down or overnight, but comes on the next day. I have used the sat navigational device plugged into the cig lighter when i picked the vehicle up and having read the threads this could be problematic. Any advice on any of these lights please.

Thanks

I have checked the cig fuse which is OK, if the battery is disconected for a 2-3 hours the engine light does not come on when the engine starts.