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• P1630

  P1630

  
  

  Diagnosis information - CAN

  
  

  Steering wheel electronics (CAN comfort) control unit, communication Diagnostic conditions

  The steering wheel electronics 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.
  Steering wheel electronics control unit wake-up through:
  
  
• Event-induced CAN message
• Ignition on
  
  

  Possible fault causes

• No power supply for steering wheel electronics control unit
• Steering wheel electronics control unit is incorrectly coded
• Short circuit or open circuit in the CAN comfort
• Steering wheel electronics control unit faulty (in most cases the cause is not the steering wheel electronics control unit but incorrect coding.)
  
  

  Fault effects

• Communication via the CAN comfort is no longer possible.
• No other control units are able to communicate with the steering wheel electronics control unit.
  
  

  Affected contacts on the steering wheel electronics control unit

  
  
  Connector [A]:
• 1 ground supply - terminal 31
• 2 power supply - terminal 30
• 8 CAN comfort low
• 9 CAN comfort high
• 13 power supply - terminal 15