19
2001 model year changes
Changes made to the E39 IHKA
• New Control Unit (since 9/00).
• Addition of solar sensor (since 9/00).
• New IHKA integrated heater and air conditioning case (since 3/00).
IHKA IV Control Unit
The “REST” button on the control unit has been
replaced with a “MAX” button. Two different functions
are carried out by pushing the MAX button:
• Maximum cooling function
• Residual heat function
Determination of which function will be enabled is
based on switching criteria.
A/C MAX function
(This feature was introduced in the E38 since 9/99)
Maximum cooling performance is automatically activated by pressing the MAX button. An
LED on the button illuminates to indicate that the function is active.
Criteria for operation:
Terminal 15 “on” , MAX button pressed and outside temperature above 60
o
F.
The following settings are adjusted or activated:
• Temperature control is canceled and the temperature display indicates 60
o
F.
• Both water valves are closed.
• The left and right Y-factors are set to -27.5%.
• The compressor is switched on (LED turns on in the A/C switch).
• The blower setting is set to maximum.
• Recirculation is activated (LED turns on in the re-circ switch).
• Air distribution is set to center vents only.
Operation of the max defrost is overridden by selecting MAX. The operation of the rear win-
dow defogger is not affected.
