I have a same type of pb with my avic n2. Ship my unit to pioneer and got it back a week later fixed for free
Pioneer,1925 E. Dominguezst, Long Beach, CA 90810
Tel 800 746- 6337
Sent your unit there with your address, email, phone #, add a letter to explaine de pb. If the pb is the flex cable, they will fix your unit for free.
On my case, they also fixed the knob which was broken