ok here's my issue, i installed the appradio 2 and everything seemingly works fine except i needed to install the microbypass to allow mirroring to my iphone 5 (which is really restricted) and allow me to use it when i please. So i get the 2013 pioneer microbypass and i install it just as the instructions say i should and my iphone is being mirrored just fine except now on my dash the brake light has turned on.

So my question is:

Should my brake light be on? or have i done something wrong ?

The e-brake isn't engaged, it's completely disengaged and i have unplugged the battery for some time and the light is still on.

Please any help with this would be great.

Light should not be on because you should not have any wire going to the parking brake. 3 wires. Ground, switched power and green parking brake wire from HU. That's it.

So i get the 2013 pioneer microbypass and i install it just as the instructions say i should.

Clearly you didn't.