Yes, they should come on. Try wiggling the dimmer "wheel" switch and see if they flicker on. I have a 96 GC with a simular problem. At one time I could wiggle that switch and the forward map lights and only those lights would flicker on and off. Now they don't come on at all unless I manual push them on. At the time I talked to the head mechanic at the local dealer who said the contacts in that switch are weak and they go through a lot of them. They wanted $108 dollars for the 3 switch set in that panel and didn't sell the individual switches. I blew it off and have been living with it since. I can still turn them on manually if needed. Please let us know what you find.