In this video, I show how you can replace just the electric motor inside a folding wing mirror (or door mirror, if you prefer) instead of replacing the whole mirror, casing and all, at significant cost.

The car I work on is a 2010 Citroen C5 (X7) with heated mirrors and auto-dimming, but this will almost certainly work on most if not all PSA group cars with motorised wing mirrors. The method and principles shown here will probably also work on cars from other brands.

This covers the entire disassembly process and how to get to the electric motor that failed.