One problem related to anti-theft controller has been reported for the 1998 Chevrolet Astro. The most recently reported issues are listed below.
Security light kept coming on. Then car would not start, then took to dealer ,and the fuel pump had to be changed. One week later, vehicle would not start again , changed the sensor . Two weeks later, vehicle would not start once again. Towed truck to dealer, and they took out the dash and replaced a switch.