SmartStart installed in modern vehicles DOES impact the electrical system. I have been working closely with GM over the past 7 months trouble shooting and replacing various components on my vehicle. Bottom line is the device is interfering with the computer components. This isn't a simple by-pass device like in the old days where you pull wires out of the bottom of the steering wheel and start the car. This connects directly into the computer system - it's the only way to interrupt the ignition cycle. This causes the ignition and timing system to go into safe mode, limiting acceleration and reducing power.
Of course, the state (MN) denies this and says it does not interfere, and SmartStart will accept no liability. I will probably be hiring an attorney since I have a ream of documentation from GM.
I like the concept of ignition interlocks, but the blatant corruption evident in the system is hard to ignore. It is a big money grab overall and of course - since it's an administrative penalty, it is executed without due process.
I am hoping someone is able to successfully challenge the constitutionality of this and get it changed. It's a great idea for habitual drivers (but does anyone believe the hardened DWI people are installing this and following the rules??). But I have a hard time with the love-affair between state and a private company with no recourse for the consumer.
Product or Service Mentioned: Smart Start Ignition Interlock Device.