I need help! Trying to use 555 timer to pulse but input will be steady state.

I am trying to figure out a cct which uses a 555 timer to send a pulse
to imitate pressing of a button when I turn the ignition on. I want the
pulse to be about one second long.
The thing is, when I start the car the trigger will always be at a
steady state, not a pulsed input.

I have tried this, but the output just stays low, if the trigger is
steady state low.

I was thinking I could use the momentary position of the ignition
switch which turns the motor and it would be like an trigger pulse, but
I wish to use he same circuit more than once , and when the car is
already running.

Anyone any ideas on this?

Thanks.

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