Contents: Watch maintenance ↡ Turning on additional heating ↡ Setting the time ↡ Additional heating operation ↡ Heating mode ↡ Turning off additional heating ↡ Safety devices ↡
Additional heating can be switched on with the vehicle engine running or not.
Turning on the heater:
The heater is switched on using the clock located above the interior rear-view mirror.
Please note: Additional heating must be switched on at least once a month for approx. for 10 minutes.
When the fuel supply is less than 15 liters, additional heating is switched off automatically.
Fan and air conditioner with additional heating on
In preheating mode, with additional heating on, the fan automatically switches to stage 1. Any fan stage can be selected while driving. In cars without air conditioning, before turning on the heater or after entering the preselection time, the temperature controller should be set to maximum heating power (red range). In cars with air conditioning, setting the temperature controller to maximum heating power is not required.
Watch maintenance
1 Symbol
— the current time is indicated.
2 Symbol
— preselection time is activated.
3 Button
- activation of the re-selection time, setting the hours and minutes.
4 Actual time or preselection time.
5 Symbol
— control LED.
6 Button
— turning on the heater, setting the hours and minutes.
Attention! If the power supply is restored after an interruption, all symbols and numbers on the display flash. In this case, the clock should be reset.
Original source of information: MercedesMan.ru
The heater can only be turned on after setting the time on the clock. The watch can remember the preselection time. The preselection time can be selected within 24 hours. The heating duration is 60 minutes. The clock illumination is produced when the heater is on.
Turning on additional heating
Click the button
- heating duration is 60 minutes. Indication: remaining time and symbol 
. To turn off the heater: press the button 
. Coasting is performed for 3 minutes. Indication: current time and symbol 
. Activate preselection time: press the button 
. Indication: preselection time and symbol 
are displayed before the heater starts. Turn on the heater: press the button 
indication: current time and symbol 
.
Setting the time
Press the button at the same time
and the button 
.
The clock is blinking.
Setting the clock: press the button
.
Setting the minutes: press the button
.
The minutes are flashing. Click the button
.
Once the installation is complete, click the button
or wait 10 seconds until the current time is displayed 
and symbol.
Calling/setting preselection time.
Click the button
, then press the button at the same time 
and the button 
— the clock is blinking.
Setting the clock: press the button
.
Setting the minutes: press the button
. Minutes are flashing - press the button 
.
Write preselection time to memory:
After installation, wait 10 seconds. The current time is displayed
and symbol.
Activate preselection time: press the button
. Preselection time and 
. The heater is switched on at the indicated preselection time.
Additional heating operation
When turned on, the symbol in the clock lights up. After approximately 20-50 seconds, the heater begins to operate at full heat flow.
Heating mode
Depending on the heat consumption, different operating states are set.
Heat output 5,000 W or more: heater at "Full Power" stage.
Heat output between 1,250 W and 5,000 W - the heater switches between "Full power" and "¼ power" stages.
Heat output less than 1,250 W: The heater switches between the "Off" and "Full power" settings.
Turning off additional heating
When turned off, the symbol in the clock goes out. The coasting is in progress. The blower fan and water pump operate for 120 seconds and then turn off automatically.
Safety devices
If a fault occurs that causes the heater to overheat, the heater will automatically switch off for safety reasons. The control unit contains a diagnostic system that recognizes faults, records them in memory and displays them. If a malfunction occurs, contact an authorized service station as soon as possible to have it fixed.