It happened in my original09 M35 and it has now happened in my 2nd 09 M35. If you have reclining / temp seats with controls in the armrest, the wiring harness for all those rear controls kinks up or loosens up. It was an easy fix in my original M35 - just a matter of seat removal and loosening the main rear harness so it was not affected by the armrest position. I tried that fix in my current M35 but no-go. Apparently, the harness is ka-put. Luckily, the only effect is that O have no volume control. The screen functions normally, but no sound.
I'm a bit busy these days so I don't have the time to dismantle the rear seats, etc. When I get a block of time to dive into this, I'll snap some photos and create a DIY. I doubt there are many members out there with this feature - rear movie screen, DVD surround sound, reclining/heated seats and a plethora of armrest controls for the rear passenger. I looked up my VIN and here is what this 'curse' cost back in 2009. I think it was only available for 1 or 2 years.

year:2009
make: Infiniti
model: M35 4dr Sdn RWD
engine:VQ35HR V6 DOHC 24 valve 303 hp @ 6800 rpm
transmission: 7-speed shiftable automatic
basic warranty: 4 yr / 60,000 miles
MPG: 17/25 combined: 19 MPG

MSRP $48,500
INSTALLED OPTIONS
50 State Emissions $0
Moonlight White Tri-Coat Pearl $750
Wheat, Leather Seat Trim
Premium PKG $9,650
includes:
• Technology Pkg
• Advanced Technology Pkg
* 14 speaker Bose surround sound
• Mobile Entertainment System
• Pwr reclining & heated rear seats
• Rear passenger controls for climate &
audio w/driver lock-out
* electric rear window shade
(4) Painted Splash Guards $165
Trunk Mat $105
Shipping Charge $865

Retail Price (originally new): $58,035

That's ridiculous!

Ilya wrote: ↑

Fri May 27, 2022 5:55 am

That's ridiculous!

I think I know why this package was only available for a few model years. Of course, those dollar amounts are only as accurate as the website that offers 'official window stickers' based in VIN.

i have the same package as you, i think it was called "entertainment package". one of my rear seat is no longer heated or reclined. all sound functions and buttons still work; I think. i haven't sat back there since forever.

I just saw an 09 M35X with like a 78,000 Miles with the same exact pkg, do you advice against buying it and just getting one with advanced technology pkg,I don't wanna get stuck with a plethora of problems