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Official AVIC NEX Bypass (AVIC NEX Units Only)

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bypass - does not work on AVH-4x00NEX devices.
only for AVIC of all versions NEX.
for 4000/4100/4200 the check was only for the parking brake(PKB)

For the AVH-4400NEX in Pioneer did a double check of PKB\SPEED

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8200Nex. I did the parking brake green to ground wire and pressed the lower left corner.  Confirmed it worked for me. 

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I applied the software bypass to my 8200 NEX unit and grounded the parking brake and it appears to have worked, but there is some weird behavior.

Before I get started. I'm a computer hardware/software engineer and I work in the enterprise storage/server space on linux kernel modules and embedded systems so my background in this field is strong.

I intermittently get the "Parking brake misconfigured" message and I suspect I know the reason.  It seems like I get this message whenever the car starts moving before the head unit has fully booted. My explanation of this has to do with the NEX boot loader on the radio and non-volatile configuration settings.

I believe that the software bypass feature is read from non-volatile storage somewhere during the boot procedure of the radio. This means that by default the radio starts to boot with the bypass disabled, and at some point during the boot procedure the unit reads the software setting out of their non-volatile storage. This would explain the behavior I have seen with the "Parking brake misconfigured" message appearing whenever I start driving the car before the radio is finished booting.

I'll keep paying attention to the behavior and if something changes I'll update my hypothesis. 

 

 

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