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.