The seat belt warning light does not light at all and no seat belt chime. I checked the light bulb, and it's OK. I tried the BeltReminder activation/deactivation procedure. The manual says, "After step 5 the safety belt warning light will be turned on for three seconds." I didn't get that. How can I troubleshoot this?

Update:
I disconnected the wire connector under the driver's seat. Air bag light blinked 4-6.

Update 2:
Countless hours of googling, I found, "the manual shows a light green and a black wire for the seat belt buckle switch which is for the "fasten belts" light on the dash.
The seat belt pretensioner wires should be light green/black and light green/ red." This was for 2004. It appears the belt warning light is a separate component from the air bag light. I checked the wires under the driver's seat. There are 4 wires bundled into a connector. The wires are: GRN/RED, BRN/LT BLU, LT GRN and BLK. I'm guessing BRN/LT BLU in 2002 is LT GRN/BLK in 2004. I also read somewhere that the seat belt warning is normally grounded. Once buckled up, the grounding goes away. Since I don't want to trip the air bag, I'm not going to do anything to the wires until I'm sure about which wires are which. I was able to locate 2001 Ranger EV wiring diagram, and the diagram shows BRN/LT BLU wire is going into the GEM and converted to YEL; then go to the cluster.