I found this info from another forum on the net. This works great. My issue was the air bag light on the dash would flash 2 then 7 times (code 27 ?). The passenger side air bag switch would not illuminate when off, like it should. As it turns out, when this lamp burns out in the key switch module you get a code or an air bag code. Following these instructions I found on the web, purchasing a new lamp from Radio Shack (part number listing in the instructions) I fixed the problem. It worked great. I hope it can help someone else. Here's the post I copied:
Parts:
1) 12-volt colored lamp (Radio Shack part: 272-1099)
Tools:
1) socket set
2) philips head screw driver
3) soldering iron
Procedure:
1) remove ash tray from console panel
2) using a socket set, remove 4 hex head screws from console panel
3) pull console panel out of the two clips
4) remove connector from air bag key module in console panel and take console panel to a work bench
5) remove 2 philips head screws to remove the airbag key module
6) carefully unclip the plastic tabs that hold the airbag key module case together
7) remove connector circuit board from air bag key module
8) solder the yellow replacement lamp to the two solder pads for the original lamp on the back side of the circuit board (which wire to which pad does not matter)
9) tie the replacement lamp in place next to the original lamp
10) replace the circuit board in the airbag key module and snap the case back together
11) connect the airbag key module in the
[COLOR=blue! important][COLOR=blue! important]truck[/color][/color] and start the engine to check that the lamp illuminates and that the alarm does not sound
12) screw the aribag key module back into the console panel
13) snap the console panel back into the
[COLOR=blue! important][COLOR=blue! important]truck[/color][/color]
14) replace the 4 hex head screws
15) replace the ash tray