Ihka Climate Control - Overview - E36: Diagnosis BMW 3 series E46

Control Panel/Module Test Display (12-95 To 3-97 Production)

The E36 IHKA control panel/module includes additional programming that allows system diagnosis without the use of the DIS or MoDiC; sensor values and other inputs are shown on the LCD display. This function is found on systems produced from 12-95 thru 3-97.

Identifying Control Panel/Module Test Display. Scheme 23

The sensor display mode is activated by pressing the "AUTO" and rear window defroster buttons simultaneously.

Identifying Auto Buttons. Scheme 24

Identifying Rear Window Defroster Buttons. Scheme 25

Available displays are

1. Interior temperature
2. Ambient temperature
3. Left heater core temperature
4. Right heater core temperature
5. Evaporator temperature
6. Engine speed
7. Road (vehicle) speed
8. Y-factor value
9. Fresh-air flap position (in % up to 99.5%)
10. AUC sensor voltage (if equipped)
11. Battery voltage
12. Software version.

The sensor display is switched "Off" by pressing the "AUTO" and recirculating air buttons simultaneously, or by switching the ignition "Off."

Identifying Auto Button. Scheme 26

Identifying Recirculating Air Button. Scheme 27

Note. The control panel/module LED display does not include a decimal point or percent symbol, so 99.5% is displayed as 995.

Temperatures are always shown in degrees Celsius, regardless of module coding.

Blower speed cannot be adjusted during sensor display mode.

Service-Station Feature

This service station feature continues on IHKA E36. The control panel/module continues to power both coolant valves closed for about 3 minutes after the ignition is switched "Off." This feature prevents the heater cores from being flooded with hot coolant when the engine is shut off for brief periods (e.g. during refueling).