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Diagnostic - CPU Issues
A CCU with a non-working CPU won't show any signs of life. All display elements, LEDs, buttons and knobs are non-working. When plugged into the vehicle, no initialization motor movements can be recognized. One way to confirm a CPU problem is to check pin 30 of the CPU with an oscilloscope. That pin carries the clock signal and should show a 11.9 MHz wave of 3 V peak-to-peak:

If the CPU is unable to start, the following ...