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• P1603

  P1603

  
  

  Diagnosis information - CAN

  
  

  Fault entry in specified control unit NOTE: Internal function test completed.

  
  

  Diagnostic conditions

  
  
  The 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.
  Control unit wake-up through:
  
  
• Event-induced CAN message
• Wake-up signal via wake-up line
• key contact (terminal S)
• Ignition on
  
  

  Possible fault causes

• Control unit is incorrectly coded
• Periphery connected to specified control unit is incorrect
• Control unit faulty (in most cases the cause is not the control unit but incorrect coding.)
  
  

  Fault effects

• The specified control unit sends only substitute values via the CAN.
• Other control units detect these substitute values and set this fault code.