U0001

U0001

Diagnosis information - CAN DME control unit, communication Diagnostic conditions

The DME control unit initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.

DME control unit wake-up through:

• event-controlled CAN message
• Ignition on
  
  

  Possible fault causes

• No power supply for DME control unit
• DME control unit incorrectly coded
• Short circuit or open circuit of CAN Drive
• DME control unit faulty (in most cases the cause is not the DME control unit but incorrect coding.)
  
  

  Fault effects

• No communication can take place via CAN Drive
• No other control units are able to communicate with the DME control unit.
  
  

  Affected contacts on the DME control unit

  
  
  Connector [A]:
• 1 Ground supply - term. 31
• 2 Ground supply - term. 31
• 3 Ignition lock-Terminal 15
• 21 Power supply-term. 15
• 62 Power supply - term. 30
• 58 CAN Drive low
• 60 CAN Drive high