Mercedes-Benz SLR-Class 2007 - Manual (Page 199)

198
Controls in detail
Automatic climate control
Activating
̈ Turn the SmartKey in the starter switch
to position 1 or 0 or remove it from the
starter switch.
̈ Press button T ( ୴ page 188).
The indicator lamp on button comes
on.
Deactivating
̈ Press button T ( ୴ page 188).
The indicator lamp on button goes out.
The residual heat is automatically turned
off:
ț when the ignition is switched on
ț after about 30 minutes
ț if the battery voltage drops
ț if the coolant temperature is too low