Parked Car Ventilation

IHKA E32 PARKED CAR VENTILATION







Initially available on only the 750iL, parked car ventilation uses IHKA climate control system components to circulate fresh air through the cabin at driver pre-programmed times. This can lower cabin temperature by up to 18 degrees F (10 degrees C).

On vehicles equipped with parked car ventilation, two additional components interact with the IHKA climate control system:
- the Parked Car Ventilation Dual Relay (located above the glove compartment)
- the On-Board Computer (OBC)

For parked car ventilation to function, the driver must program cabin ventilation time(s) into the on-board computer (OBC). When the clock in the OBC reaches the programmed time(s), the OBC grounds a coil to energize half of the parked car ventilation dual relay. This part of the dual relay then directs power to two more relay coils.

One of the relays that is now energized sends a ventilation request signal to the IHKA control module. The module then opens the fresh air intake flaps and face vent flaps, closes all other flaps, and sends a low speed blower signal to the final stage unit.

The second relay, the blower relay, supplies battery voltage to the final stage unit and the blower motor.

The on-board computer starts a timer when it activates parked car ventilation and, when one-half hour has elapsed, the OBC shuts off parked car ventilation.

Parked-car ventilation is switched off automatically if:
- battery voltage drops below 11 volts (measured by the OBC), or
- the driver enters the vehicle and turns the ignition switch to "run"







Ventilation time programming is as follows:
- Turn ignition switch to "Accessory" (KI. R).
- Press the "Timer" button twice ("T1" is displayed).
- Enter the first desired "On" time.
- Press the "SIR" button (this turns the left LED "Off").
- Press the "Timer" button again ("T2" is displayed).
- Enter the second desired "On" time.
- Press the "SIR" button (this turns the right LED "Off").

The programmed times will remain in OBC memory until they are overwritten by new times or the memory is cleared.

To deactivate the parked car ventilation system, press the "SIR" button while "T1" or "T2" is displayed (this turns the LED "Off").

Parked car ventilation will not operate if ambient temperature is below 60 °F (16 °C). However, it can be activated for testing by pressing the "Timer" and "Temp" buttons simultaneously with the ignition switch at KI.R.