Program 98 Keyless Remote

Can someone please tell me how to program the keyless remote to my van? I have looked over all the posts in the Astro and Safari forum, but I couldn't find one that work... I have even tried one from LeSabre forum. It says that when I close the door, the van is suppose to cycle lock/unlock but it didn't happen. To make a long story short... I have two remotes that my van won't respond to now as supposed to just the one... Help, please!!

Can someone please tell me how to program the keyless remote to my van? I have looked over all the posts in the Astro and Safari forum, but I couldn't find one that work... I have even tried one from LeSabre forum. It says that when I close the door, the van is suppose to cycle lock/unlock but it didn't happen. To make a long story short... I have two remotes that my van won't respond to now as supposed to just the one... Help, please!!

Jump pins 4 & 8 in the OBD II connector
locks will cycle
Press Lock & Unlock for 10 seconds on first remote
Locks will cycle
Press Lock & Unlock for 10 seconds on next remote
Locks will cycle
Remove jumper

Up to 4 remotes can be programmed

When I put the jumper in the OBD II connector... should the key be in? If so, at ON or OFF position?

Will this work on a 2000 Astro too? I just got a new second remote and need to program it also. Where is the 4 and 8 pin on the OBDII connector? Where is the connector actually located? Thanks.