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On-Board Diagnostic - Adaptive Led Headlights Control Module
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DTC U2121-87: Communication Error With Vehicle Control Module (VCM) [Adaptive Led Headlights Control Module]
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Diagnostic Procedure
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Diagnostic Procedure
Perform an inspection in accordance with the multiplex communication system diagnostic procedure. (See
CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)]
.)