Pre-facelift US G500s are known for well-documented electrical quirks: temperamental power-seat switch assemblies that move only forward until 'love-tapped' or cleaned with contact cleaner, plus SAM units, door locks and window regulators. The Teleaid/SOS cellular system is dead on all early cars (its network is gone) and shows a startup error that is simply coded out; a rare CAN-bus wiring fault under the seat also appears.
Early-MB electrical gremlins: seat switches, SAM units, Teleaid/SOS
Mercedes-Benz G-Class (W463 1990-2018) · ownership