I had the same problem with my 98 Grand Caravan. I repeatedly tried the standard methods with no luck. I finally found an alternative method on this web site where you can pop off the top of your dashboard (easier than it sounds) and ground a pin on your RKE module. Worked like a charm! I can't remember the exact pin but the info should be easy to find with a search or two.
As for the maximum fobs programmed, I believe that is a total number at any one time, not the number of programming operations. I assume you don't have have 4 fobs programmed currently.
Last edited by 98Caravan; 01-23-2008 at 08:28 AM.
Reason: added info
1998 Grand Caravan Sport 3.3 175K Miles
2005 PT Cruiser TE 2.4