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Other than the codes you see, what are the issues you are tracking down? If none, wouldn't it make sense to try another code reader? As far as I am aware the code reader would still only communicate over the diagnoses bus (assuming this is LIN).
The instrument cluster in your car does not have a speed input. So it will get speed info over CAN from the ABS unit. If that works, the CAN is operational. If cruise control works it means that speed info also comes from ABS to DME.
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