dei 555l

Some hints:

Red "Theft" light on dash (briefly after start) = Passlock I

Yellow "Theft" light on dash (briefly after start) = Passlock II

"PK3" written on Key = transponder system (likely for 2003+)

Vats = resistor on key shank.

Some hints:

Red "Theft" light on dash (briefly after start) = Passlock I

Yellow "Theft" light on dash (briefly after start) = Passlock II

"PK3" written on Key = transponder system (likely for 2003+)

Vats = visible resistor on key shank.

Some hints:

Red "THEFT" light on dash (briefly after start) = Passlock I

Yellow "THEFT" light on dash (briefly after start) = Passlock II

"PK3" written on key = Transponder (likely 2003+ only)

VATS = Visible resistor on key shank

Well if you're throwing in the towel, then you owe us 5 cents each for the swell advice (I get 15 cents for posting my reply three times)

Actually the right way is to just take apart the ignition switch. Look for a couple of thin guage wires. They should be (white w/BLK trace) or (Violet w/YLW trace). Some were Both YLW or Both WHT. The givaway though I think is the small gauge.

The 555U (Universal) might work best for this situation since using a spare key assures you it will work, regardless of the system.

Just get a spare key from Mr. Dealer, (test it first!) and hook it in.

i have checked all my sources and they tell me that vehicle doesnt have any factory anti-theft for that model year....

it does have a factory alarm, but no anti-theft to worry about.....

Update: I sent an email to DEI tech support asking them what unit of theirs I would need to solve my problem. Tech support confirmed the fact that a 1999 Pontiac Grand Prix does not have any factory immobilizer anti-theft system. Therefore no DEI module was needed. After explaining to him that I have a bulldog remote starter that works without the system being armed, he told me chances are that the remote starter unit wasn't interfaced with the factory keyless entry system, and he sent me a wiring diagram, https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1999&make=Pontiac&model=Grand%20Prix&ID=18793&type=Alarm ,showing which wire was the factory disarm wire. Sure enough the remote starter wasn't connected to it, so I connected the "factory alarm shutdown", RED / black wire, coming from the remote starter into the ORANGE / black, disarm wire, on the Driver's Kick Panel 32 pin harness, pin #5. And that was it! Now I can arm the system and have it remote start without the horn going off. One simple wire that was overlooked by the installer of the unit costed me a lot of time and some money, but I hope this information will help anyone else out there with this same problem. Thank you all for your replies.