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How does the micro bypass work?


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It is basically a NO or normally open switch, power comes on, it waits a bit, the switch closes then re-opens. That is the regular micro bypass, the AVH 8400 requires a double pulse so same thing - power on, wait a bit, switch closes, switch opens, switch closes, switch opens. Not sure if the 5500 needs the single or double pulse. Also, I have a 4400 which needed a single pulse bypass but then I installed the separate nav module and it needed a double pulse bypass with the navigation installed.

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  • 4 weeks later...

i Have a avh-5500bhs and am interested in making my own bypass as well.

Can i just pulse 12 volts or negitive wire to the parking brake wire ?

how exactly does it work ?

Currently I am using a arduino and a transistor.  I am powering the arduino from the amp turn on wire from the head unit.  I just wrote a simple code to pulse to ground the ground wire.  Really easy

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  • 7 months later...

I had a 'regular' bypass that I had used for a Sony XAV-602BT that was just a relay.   Initially when I got a AVH-8500BHS I used my old bypass and put a switch on it so I could flip it the second time.  Ended up installing a Microbypass last week.   It's such a small convenient package I couldn't justify building my own.

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