Heater connections, auxiliary heater
 
  
 
 
  
   
    
     |  | Heater connections, auxiliary heater | 
   
  
  
   
   
   
   
    
    
    
     
      
      
      
      
      
      
      
      
     
     
      
       | Pin No. | Cable colour | Component/function | In/out | Test conditions | Across | Test reading | See | 
      
       | 1 | RD | Power supply +30 | In | . |  |  |  | 
      
       | 2 | BK | Ground | In | . |  |  |  | 
      
       | 3 |  | I-bus | In/Out | . |  |  |  | 
      
       | 4 |  | No connection |  | . |  |  |  | 
      
       | 5 |  | No connection |  | . |  |  |  | 
      
       | 6 | WH | Fuel pump | Out | . |  |  |   |