Hi I brought a xav-ax1000 apple carplay unit for my Vauxhall corsa D fitted and works a treat until the other day got in the car and the unit did not power up  checked the ovs fuses connections all ok I put the original factory unit back in powered up . I then reconnected the sony unit and all worked again . After a week or so the same thing happened has any one else had this issue I will admit I have not connected the hand break lead and the only other thing in line is a steering wheel control unit