COMPRESSOR SHUT OFF SIGNAL (if applicable)

The IHKA module monitors the full load input from the ECM. If the ECM detects "full load" conditions, it signals (KOREL) the IHKA control module to disengage the A/C compressor. The conditions for full load are:

• Vehicle speed less than 10 mph, and 
• Throttle is wide open or 
• Engine coolant temperature is too high

  The compressor is turned off for a maximum  of 4 minutes (actual duration differs per system).

  Fig 1: Compressor Shut Off Signal Circuit Diagram

  Courtesy of BMW OF NORTH AMERICA, INC.