Principals

IHKS Principle of Operation
Air Distribution
A single cable attached to the Control unit and the heater assembly allows the operator to control the direction of outlet air.

Fresh/Re-Circulation Air
The re-circulation switch on the control panel signals to the Body Control Module (BC1), which in turn controls the fresh/re-circulation flap via a DC servomotor. The servomotor consists of a unidirectional electric motor with an integrated flap lever mechanism and is driven end-to-end, and then switched off on a timer (maximum run time =10 seconds). The servomotor also has internal limit switches to disconnect power. There is no feedback to the BC1 or INKS concerning flap position.

Heated Rear Window (HRW)
The HRW is controlled by the BC1. A momentary push of the switch signals the BC1 of the request for HRW. It is only possible to operate the heated rear window when the engine is running. When the switch is pressed with the engine running below 400 rpm nothing will happen. If the engine stalls while the HRW is on, the heated rear window and LED will switch off until the engine restarts.

The HRW on time is timer controlled.
- The timer duration will depend upon outside ambient temperature. At 10° C and above the HRW will operate for 12 minutes. Below 10° C the HRW will operate for 20 minutes.
- The timer values are stored in EEPROM in the BC1.

A press of the switch while the LED is illuminated will turn the heated rear window off and extinguish the LED.


Heated Front Windshield (HFS)
The operation and configuration of the heated front screen control is identical to the heated rear window control, with the following exceptions:

- At 10° C and above the timer will run for 3 minutes. Below 10° C the timer will run for 17 minutes.

The timer values are stored in an EEPROM in the BC1.