Cadillac STS Problem

I'm in the process of installing a Coolstart RS330 RS in a 1999 Cadillac STS. Everything works fine except the anti-theft. RS works with the key in the ignition. First I tried using a GMDLBP (worked a couple of times then quit). Then I tried using a GMBP. It programmed up but will not let the car start. Both units will shut off the security light but the car won't start yet the ignition will stay on and act as though its running (dash display lights up SERVICE ANTI-THEFT SYSTEM), I tried reprogamming them several times with no luck. Also tried different ground points. I also have had this problem with Park Avenues. Any suggestions?

have you tried other bypass combinations?      like a 555G and 456B together?Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979