Fan control module IHKA

From terminal 15 ON, the blower is activated corresponding to the function previously selected (DEFROST, MAX AC, automatic blower function, individual blower setting). Blower activation takes place in linear form from 0 to 8 Volt. The IHKA is switched off in the blower zero position. Blower activation is infinitely variable in automatic mode.

The following 5 settings are possible for blower activation:

• Blower zero position
  
• Individual blower setting
  
• Automatic blower (AUTO button)
  
• Defrost/MAX AC function with automatic blower setting
  
• Defrost/MAX AC function with individual blower setting
  

The function light is deactivated in automatic mode and in defrost/MAX AC function with automatic blower setting.

The following settings apply to blower zero position:

• Blower switched off
  
• Air distribution flaps, position unchanged
  
• Fresh air/recirculating air flap, recirculating air setting
  
• Temperature mixing flap, cold setting
  
• Rear window defogger not switched off (can be activated)
  
• Sensor blower of temperature sensor for vehicle interior not switched off (active)
  
• Compressor switched off