Mercedes-Benz 2001 ML 55 AMG - Manual (Page 106)

103 Climate control
Technical
data
Instruments
and controls
Operation Driving
Instrument
cluster display
Practical hints Car care Index
Rear window defroster
The switch is located on the center console.
With the engine running, press upper half of the switch.
Indicator lamp in switch comes on.
To cancel, press upper half of the switch again. Indicator
lamp in switch goes out.
Notes:
Heavy accumulation of snow and ice should be removed
before activating the defroster.
The rear window defroster consumes a large amount of
electrical power. To keep the battery drain to a
minimum, turn off the defroster as soon as the window
is clear.
The defroster is automatically turned off after
approximately 10 to 18 minutes of operation, dependent
on the outside temperature.
If several power consumers are turned on
simultaneously, or the battery is only partially charged,
it is possible that the rear window defroster will
automatically turn itself off. When this happens, the
indicator lamp inside the switch starts blinking for
approximately 30 seconds. If within this time the
battery has sufficient voltage, the rear window defroster
automatically turns itself back on.
After approximately 30 seconds without sufficient
voltage the rear window defroster switches off (indicator
lamp goes out).