2008 Mercedes SL-Class Owner's Manual - Page 128

Controls in detail Seats Vehicles with seat ventilation* The red indicator lamps on the switch indicate the selected heating level: Level 2 Two red indicator lamps on (rapid seat heating) The seat heating automatically switches to level 1 after approximately 5 minutes. 1 One red indicator lamp on (normal seat heating) The seat heating automatically switches off after approximately 30 minutes. off No red indicator lamp on Switching off seat heating Press switch 1 repeatedly until all red indicator lamps go out. i If one or both of the lamps on the seat heating switch are flashing, there is insufficient voltage available since too many electrical consumers are turned on. The seat heating switches off automatically. 1 Seat heating switch Switch on the ignition ( page 40). Switching on seat heating Press switch 1 repeatedly until the desired heating level is set. One or two red indicator lamps on the switch show the selected heating level. The seat heating will switch back on again automatically as soon as sufficient voltage is available. 127