Disabling System (C220 & C280)
Turn ignition off and remove ignition key. Disconnect and shield negative battery cable. Remove covers as necessary to access horn/air bag clockspring connector (A45x1) located at base of steering column. See Fig 1. Disconnect horn/air bag clockspring connector. Remove passenger floor covering and door sill covers as necessary to access passenger air bag connector (X28/12). See Fig 2. Disconnect passenger air bag connector. System is now disabled.