Checking Version Code
WARNING: This page is about a different car, the 2001 Mercedes-Benz SL500 and 2000 Mercedes-Benz SL500. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Press REST button for more than 6 seconds. Press blower motor speed increase button to set display to "42". Current version code will be shown in A/C push button control panel display. Version code should be "03" for SL models. Press REST button to exit.