2003 Mercedes S-Class Owner's Manual - Page 248

Controls in detail Useful features Infrared reflecting windshield Your vehicle is equipped with infrared reflecting glass which reduces the amount of radiated heat entering the interior through the windows. The infrared reflecting glass also prevents the transmission of signals through the glass by in-vehicle electronic devices (e.g. electronic toll collection devices). To allow the use of these devices in the vehicle, two infrared transparent areas (1 and 2) are placed in the windshield. 1 Mounting location for electronic toll collection devices (infrared transparent) 2 Infrared transparent area (pass-through for electronic signals) 3 31.5 in (80 cm) 4 19.0 in (48 cm) 5 1.75 in (4.5 cm) 248