Automotive systems need help...

Hi i need help for the following questions... this is mainly for automotive wiring's systems... thanks you... here are the questions.

1.) When ignition switch is in start position, what device in the vehicle should only be active with key in start position?


2.) In load clasification strategy, why is it important for class-C (critical devices) not to be mixed with lower class (class A, class B)

3.) Name the standards of module to module vehicle network

4.) What is the benefit of applying such network in the vehicle?

thanks.... i badly need you help...

thank you so much...