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Home >> BMW >> 1996 >> 328is Standard >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control Inputs >> CLIMATE CONTROL Inputs >> Power And Ground Inputs

Power And Ground Inputs

Constant battery power supply (KL30) is necessary for IHKA operation as well as memory (early systems).

Switched ignition power (KL15) is required for IHKA operation when the ignition is in the "run" position. This allows the system to operate after the vehicle has been started (or limited IHKA operation if the engine is not running).

Grounds KL 31

Ground paths are provided to the IHKA to complete the circuits of the inputs, processing, and output control functions.

Fig 1: Power And Ground Inputs Circuit
G03389704Courtesy of BMW OF NORTH AMERICA, INC.
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