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Check a wiring diagram.
On 05+ at least kill switch = ignition key as far as shutdown is concerned.
Either will chop power to the ECU in the same non graceful manner.
The ignition switch is fed by an always live 10A fuse.
The kill switch is fed by the ignition switch.
The line then feeds through the alarm or alarm bypass connector.
Then on to the engine management and fuel pump relay coils.
The other end of the engine management relay coul is grounded so ECU is powered wnenever ignition and kill are conducting.
The ECU decides when to ground the fuel pump relay coil return.
The ECU relay draws power from a 20A fuse and simultaneously powers or interrupts:
Ignition coils
Purge valve connector
Cooling fan relay coil
ECU
Injectors
Air injection solenoid
O2 sensor
The instrument panel is provided with an unswitched power source but the ECU is not.
So:
Either switch simply chops power to the ECU (and other items listed above.
It makes no difference to the ECU but it might to you if you forget to turn the kill switch back on.
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