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• P1631

  P1631

  
  

  Diagnosis information - CAN

  
  

  Gateway (CAN drive) control unit, communication Diagnostic conditions

  The gateway 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.
  Gateway control unit wake-up through:
  
  
• Event-induced CAN message
• Wake-up signal via wake-up line
• Ignition on
  
  

  Possible fault causes

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

  Fault effects

• Communication via the CAN drive is no longer possible
• No other control units are able to communicate with the gateway control unit.
  
  

  Affected contacts on the gateway control unit

  
  
  Connector [A]:
• 1 power supply - terminal 30
• 6 CAN drive low
• 11 ground supply - terminal 31
• 13 Wake-up
• 14 power supply - terminal 15
• 16 CAN drive high