Infiniti M35, M37, M45 & M56 Interior and Electronics Parts Guide

The Infiniti M-Series — M35 and M45 from 2006–2010, M37 and M56 from 2011–2013 — was Infiniti's flagship luxury sedan before the Q70 took over the nameplate. It's been out of production long enough that OEM parts, especially interior and electronic components, are getting harder to find. If you own one, this is what to prioritize. Electronics tend to fail quietly and get worse over time. ECU/engine computers, wiring harnesses, and fuse boxes are the backbone of everything else in the car — a corroded fuse box or a wiring harness with a chafed connector can cause problems that look unrelated, like an instrument cluster with flickering gauges or a climate control unit that stops responding. If your gauge cluster is showing erratic readings or dead pixels, it's usually the cluster itself rather than the sensors it's reading from. Interior wear is the other major category for M-Series owners. Steering wheels, especially leather-wrapped and heated versions, wear at the grip points first. Airbags are safety-critical and should only be sourced from a reputable supplier with clear documentation — we can help verify compatibility by VIN. Seats and seat belts see the most physical wear of any interior component, and worn bolsters or a sagging driver's seat are extremely common on higher-mileage M35s and M45s. Trim pieces — door panels, dashboard panels, center consoles, and shift knobs — are often the parts people search hardest for, since these are frequently damaged by prior owners and discontinued by Infiniti. Window switches, climate control units, navigation screens, and infotainment systems round out the cabin electronics that tend to age poorly; a stuck window switch or a navigation screen that's lost touch sensitivity are both common M-Series complaints. Speakers and amplifiers are worth upgrading on any M-Series, since the factory audio system in these cars is now well over a decade old. Downpipes and paddle shifters (on M37/M56 Sport trims) round out this guide — both are less commonly needed but worth having sourced correctly if you're restoring a Sport-trim car to original spec. Because the M-Series is discontinued, we recommend confirming your exact VIN before ordering any interior or electronic part, since running changes between model years were more common than Infiniti's official documentation suggests.