diagnosing ignition switch ?

[ReSoP]

If you start a car from the diagnostics port, but won't start or even make a noise with the ignition switch. Does this indicate a bad ignition switch?

[spdracrm3]

or a wiring issue ,also most aftermarket alarms cut and splice into the start output wire from the ignition switch and are a common to fail as not done correctly.

[330SMG]

Download a wiring schematic. They are free search Google for e30 wiring diagram.