Independent park heating/auxiliary heating with/without telestart

Independent park heating/auxiliary heating with/without telestart

Functions

Independent park heating mode is activated by way of preprogramming at the multi-information display, on-board monitor or via telestart (remote control of independent park heating) and heats up the engine and interior compartment.

Additional heater

The functions telestart, preprogramming and operation via MID or on-board monitor are not available if the independent park heater/auxiliary heater is programmed to auxiliary heater.

Auxiliary heating mode is started by the heating/air conditioning control unit if heating is required by the heating/air conditioning system or when the engine is cold and is controlled, among other things, also by the independent park heater/auxiliary heater. The coolant temperature is registered and evaluated by a temperature sensor in the independent park heater/auxiliary heater and the Y-controlled variable in the heating/air conditioning control unit. Auxiliary heating mode is not indicated in the on-board monitor or MID.

Switch-on conditions for the auxiliary heater on the M47, M51, M57 and M67

• IHKA E38 - Engine running at coolant temperature <=70°C, no undervoltage cutout, no fault in auxiliary heater and fault interlock
  

• IHR E39 - Engine running at coolant temperature <=70°C, no undervoltage cutout, no fault in auxiliary heater and fault interlock
  

• IHKA/R E39 with K-bus - terminal 61, Y>=100%, outside temperature <=10°C, blower ON, no undervoltage cutout, no fault in auxiliary heater and fault interlock
  

• IHKA/R E39 without K-bus - terminal 61, Y>=50%, outside temperature <=10°C, blower ON, no undervoltage cutout, no fault in auxiliary heater and fault interlock
  
• HS E46 - Engine speed >500 rpm, Y>=50%, blower ON
  
• IHKA E46 - Engine speed >500 rpm, Y>=50%, blower ON
  

The independent park heater/auxiliary heater (Webasto) features its own control unit.

The independent park heating/auxiliary heating is activated by the heating/air conditioning control unit by means of a wake-up line or a telegram via the K-bus. The independent park heater/auxiliary heater control unit sends a feedback via the independent park heating feedback line or a telegram on the K-bus to the heating/air conditioning control unit indicating whether the auxiliary park heater has switched on.

Heating of the coolant temperature sensor for the DME/DDE (digital motor electronics, digital diesel electronics) by the independent ark heating system must be avoided in park heating mode. In order to avoid falsification of the engine temperature for the DME/DDE, the water circuit is disconnected by a shut-off valve in the area of the coolant temperature sensor .

Shut-off valve

Whether a shut-off valve is installed depends on the type of engine.

The radio remote control function makes it possible to start the independent heating from a distance of up to 400 m.

Telestart

The range may be restricted from closed rooms. When operating, the hand-held transmitter should be held with the antenna pointing upward.

The start procedure is initiated by pressing the left-hand rocker switch. The LED at the top edge of the hand-held transmitter indicates that the start signal has been sent (flashes max. 30 minutes = running time of independent park heating system).

Initialization of hand-held transmitter for telestart:

If a new telestart receiver is installed, the two hand-held transmitters must be re-initialised.

• Interrupt the current supply to the telestart receiver for about 10 seconds by pulling the fuse as shown in the wiring diagram
  
• Re-insert the fuse and within the next 3 seconds, briefly press the OFF switch on the hand-held transmitter.
  
• Within the next 5 seconds, briefly press the ON switch on the hand-held transmitter.
  
• The remote control unit is operational after a further 3 seconds.
  
• Briefly press the OFF switch on the hand-held transmitter. The verification LED stops flashing.
  
• Finally, carry a functional test.
  
  

Undervoltage cutout

An adequately charged battery is the basic prerequisite for operation of the independent park heating system . The undervoltage threshold depends on the outside temperature and is compared with the terminal 30 voltage applied at the operating unit. If this voltage at the operating unit drops below the calculated value, operation of the independent heater is ended.

The independent park heating function can be activated via the on-board monitor or MID in ignition lock position 1 or via telestart or preprogramming in ignition lock position 0. Various settings are possible dependent on the ignition lock position.

Statuses in ignition lock position 1:

• Operating unit active
  
• Temperature control adjustable
  
• Flap program adjustable
  
• Blower adjustable
  
• Function lights ON
  
• Buttons for other functions not active (e.g. defrost, heated rear window, recirculated air/AUC and air conditioning)
  

Statuses in ignition lock position 0:

• Operating unit not active
  
• Temperature control not active (water valves open)
  
• Blower at medium speed
  
• Flap position to defrost and footwell with electrical positioner drive
  
  

The shut-off valve is further placed under current during the rinsing phase and then switches off.