Is the Ignition on? Is the Battery Voltage acceptable? Push Button Start?
These are questions any technicians have when performing diagnostics and calibration procedures on a vehicle
Ignition on state is important to achieve for accurate and desirable results. Most diagnostic, calibration and programming functions are performed with the ignition on and engine off. Remember it is important to support vehicle battery voltage levels while in this state by connecting battery support such as a battery charger, booster pack or preferably a voltage maintainer with programming setting. If battery voltage drops below 11 volts due to a discharged or weak battery, results can be skewed or procedures will not be successful.
NOTE: Battery support and chargers are not needed on Electric/Hybrid vehicles such as Toyota Prius, Chevrolet Volt, Nissan Leaf and others. Ready Mode with no battery support is sufficient. If you are not sure review OEM service information before attempting to connect any battery support or chargers to these vehicles!
So how do you know the ignition is on? This is generally pretty easy with keyed ignition switch.