Mercedes-Benz 2004 C-Class Wagon Operator's Manual page 96

Controls in detail
Seats
Switching on seat heating
Press upper switch position 1.
A red indicator lamp on the switch
comes on.
Switching off seat heating
Press upper switch position 1 again.
i
The seat heater will be automatically
switched off after approximately
30 minutes.
96
Switching on rapid seat heating
Press lower switch position 2.
Both red indicator lamps on switch
come on.
i
The system switches over to normal
heating mode after approximately five
minutes. Only one indicator lamp
remains lit.
Switching off rapid seat heating
Press lower switch position 2 again.
!
If one or both of the indicator lamps on
the seat heater switch are flashing,
there is insufficient voltage available
since too many electrical consumers
are turned on. The seat heater switches
off automatically.
The seat heater will switch back on
again automatically as soon as suffi-
cient voltage is available.