Blower Control

Updated Information 

IHKA equipped vehicles have a blower final output stage in place of the resistor pack. The output stage is installed in the blower assembly. 

In AUTO mode, the blower is automatically regulated. In the manual mode, 8 blower speeds are available. These correspond to approximately 20, 30, 40, 50, 60, 75, 90 and 100% of battery voltage.

The blower relay is energized by the BC1 whenever the ignition switch is in position 1 or 2, and the IHKA module modulates the output stage to regulate the voltage across the blower motor to control blower speed.

In the automatic blower and fresh air mode, the blower speed is corrected for vehicle speed to compensate for the increase in ram effect on the inlet air as the vehicle speed increases.