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.