How to Design a Microbypass Circuit for Pioneer GPS Requiring Two Parking Brake Pulses

I really need help designing a microbypass for a Pioneer gps car audio component.
I need to provide two "signal pulses" to fool the pioneer into thinking the parking brake/ground has been applied.
I tried to use the relay trick but it only produces a "single pulse"
Basically, the pioneer receiver requires the parking brake to be applied released and then reapplied before the video settings can be applied.
any help is appreciated.
im a new hobbyist and Ive considered some sort of timer (555 ic ?) for this function or maybe some sort of flip flop circuit.
Thanks in advance!!
jnix

Hi Justin nichols,
1 pl mention what type of pulse you require +ive or -ive .
2 are you applying the signal to a common point or is it to two different points.
pl reply i can help with a simple circuit using 555.

Regards, Sambath kumar