Embedded Electronics and Infrared Variants on the Rear Glass
Replacing the rear window on this sedan involves far more than straightforward glazing because Mercedes-Benz turned the rear glass into an active electronic panel. Unlike typical back windows that simply carry heating filaments, this unit integrates the printed conductive traces for the electric defroster grid, the AM/FM radio antenna, the cellular network antenna, and the receiver aerials for the Keyless-Go system along its upper edges. The factory delivered two primary configurations across the production run. Standard models like the S550 often utilized conventional acoustic laminated glass, whereas the flagship S600, S65 AMG, and option-coded S550 models came equipped with infrared-reflective (IR) heat-insulating glass. This specialized IR glass sandwiches a metallic layer within the lamination to bounce thermal radiation away from the cabin. It corresponds to the factory engineering superseded reference A221670048064 (formerly A2216700480). When sourcing an aftermarket replacement, matching the acoustic and solar-reflective profile of your original glass is critical so the cabin heat load matches what the climate control system expects.| Glass Specification | Factory Trim Target | Integrated Internal Elements |
|---|---|---|
| Standard Solar Acoustic | S450, S550 (Base) | Defroster, AM/FM radio, central locking / Keyless-Go |
| Infrared-Reflective (IR) Laminated | S600, S63, S65, Optioned S550 | IR thermal barrier, defroster, radio, cell, Keyless-Go |
