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13.1 Digital Data Bus (D2B)   >   13 Diagnosis - Complaint Related Diagnostic Chart

Complaint/Problem Possible cause Test step/Remedy 1) D2B Ring-Loop does not come-up (energize). Voltage supply to one of the D2B components not ensured. (Voltage is used to check for voltage supply to D2B ring-Loop components). A "Diagnosis Wake Up Call" can only be used when there is an interruption within the D2B Ring-Loop. Perform Diagnosis Wake Up Call. D2B Ring-Loop does not come-up (energize). The D2B connectors are improperly connected or are dirty. Clean and properly reconnect all D2B connections. D2B Ring-Loop does not come-up (energize) and there are no concrete indications in the DTC memory as to where the fault lies within the D2B Ring-Loop. Fiber optic cable defect. Check all the fiber optic cables beginning in a clock-wise direction (Information flow pattern) starting at the radio or COMAND unit. Also see 20 D2B Ring-Loop does not come-up (energize) and there are no concrete indications in the DTC memory as to where the fault lies within the D2B Ring-Loop. Transmitter unit of a control module is defective. Receiver unit of a control module is defective. Check all the fiber optic cables beginning in a clock-wise direction (Information flow pattern) starting at the radio or COMAND unit. Also see 20 1) Observe Preparation for Test.