2005 Mercedes SL-Class Owner's Manual - Page 120

Controls in detail Seats Vehicles with seat ventilation* The switch is located on the door. The red indicator lamps on the switch indicate the selected heating level: Level off 1 2 No indicator lamp on One indicator lamp on Two indicator lamps on Switching on seat heating Press upper switch position 1 twice. A red indicator lamp on the switch comes on. Switching off seat heating Press upper switch position 1 again. Switching off rapid seat heating Press upper switch position 1 twice. ! 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. The seat heating will switch back on again automatically as soon as sufficient voltage is available. i The seat heating will be automatically switched off after approximately 30 minutes. Switching on rapid seat heating Press upper switch position 1 once. Both indicator lamps on the switch come on. i 1 Seat heating switch Switch on the ignition ( page 36). The system switches to normal heating mode after approximately five minutes. Only the right-hand indicator lamp remains lit. 118