Thank you for your answers and for your patience Ozz,
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so as soon as you turn your ignition on, the HFM is powered up and then it waits for transmission on the CAN data bus.The DAS infrared control module (IFZ) evaluates the transponder data transferred and, if valid, releases the engine control via the CAN data bus
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Please pardon my ignorance but I am really learning a lot in depth knowledge from you;
Is the
CAN data bus the wiring harness between the IFZ and the HFM or a particular part in the car that could be check for faults and replaced?
Thank you.