AboutRob Painter Expertise Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet.
My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine.
This is why I cannot diagnose alarm problems without physically looking at the vehicle:
Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?
Experience Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.
Question I have a 99 sts, just rebuilt the motor, and got it back in. The security light is on permanently and and the car won't start. I called the shop that did the motor and got two different answers from two different guys. One guy said part of my security system was bad and could be a number of different parts such as the key system(pass key 3) or the security module. It ran fine except for the bearing knock before the engine was pulled and can't imagine it going bad just sitting there. The other guy said he thought it was the fact that it sat with the battery disconnected for 3+ weeks and the car "forgot" my keys and said that I need to find some one with a TECH 2 unit to fix it. Then he said that there may be a way to do it though the dash buttons in a certain sequence. The car won't start so it is stuck in my shop. My starter is new and I jumped the solenoid wire and it turns over fine, What now!! Bob
Answer Hello,
I do not have my reference in front of me at this moment and will later, but I don't believe the 99 STS has PK III. I believe it was the last year of VATS (Pass KEY). If so has resistor chip in key blade. Makes a big difference on my answer. Does it have a black chip in the key blade?
