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Interrogating fault memory > < Test prerequisites for self-diagnosis

Passat (B3)

Connecting fault readerV.A.G 1551 and selecting function
Connecting fault reader -V.A.G 1551- and selecting function
  Note
t  The airbag system is switched off during self-diagnosis.
t  The fault memory can only be erased on successful completion of repair and interrogation.
With ignition switched off, connect fault reader -V.A.G 1551- with lead -V.A.G 1551/3- to diagnosis connector as follows:
–  Unclip cover for diagnosis connection on right next to ignition switch.
   
–  With ignition switched off, connect fault reader -V.A.G 1551- using diagnosis lead -V.A.G 1551/3-.
  N29-0002
Indicated on display:
t  Display will show actual software version installed (shown briefly on display)
  Note
t  If nothing is shown in the display, check voltage supply of fault reader -V.A.G 1551- using current flow diagram → ”Current flow diagrams, Electrical fault finding and Fitting locations”
t  Depending on the program, additional operating instructions can be printed out by pressing the HELP key on fault reader -V.A.G 1551-.
t  The → key is used for advancing the programme sequence.
t  The PRINT key is used for switching on the printer (warning lamp in key lights up).
and then following is indicated on display:
  
V.A.G 1551     -D/7.0-         1.01.1997

      

      

    
      

      

    
Indicated on display:

      		 
      
    
V.A.G self-diagnosis                HELP
1-Rapid data transfer*                  

      

      

    
      

      

    
or
1) 
        Is displayed alternately
– 
          Switch on ignition.
– 
          Press key -1- for operating mode “Rapid data transfer”.

      		 
      
    
V.A.G self-diagnosis                HELP
2-Flash code output*                                         

      

      

    
      

      

    
Indicated on display:
– 
          Press keys -1- and -5- (the address word of the vehicle system to be tested “Airbag” is entered with 15).

      		 
      
    
Rapid data transfer                 HELP
Input address word XX                   

      

      

    
      

      

    
Indicated on display:
– 
          Confirm entry with Q key.
and then the display shows e.g.:

      		 
      
    
Rapid data transfer                   Q 
15 Airbag

      

      

    
      

      

    
The control unit identification number is displayed:
 
      Note

      		 
      
    
357 959 656                 AIRBAG IS 55

      

      

    
      

      

    
t 
           If one of the fault messages opposite appears in the display, the possible causes of the fault can be printed out with the HELP key.

      		 
      
    
Rapid data transfer                 HELP
Control unit not responding!            

      

      

    
      

      

    
t 
            (The ignition must be switched on!)

      		 
      
    
Rapid data transfer                 HELP
K wire not switching to positive!     

      

      

    
      

      

    
t 
           Faults have occurred at the start of or during the program (external cause of malfunction?).

      		 
      
    
Rapid data transfer                   ->
No signal from control unit!            

      

      

    
      

      

    
t 
           Check diagnosis leads, voltage supply and earth connection.
– 
          After rectifying the possible causes of the fault, once again enter the address word 15 for “Airbag” and confirm with the Q key.

      		 
      
    
Rapid data transfer                   ->
Fault in communication build-up

      

      

    
      

      

    
Indicated in display after entering the address word 15:
and then following is indicated on display:

      		 
      
    
Rapid data transfer
Tester sends the address word 15

      

      

    
      

      

    
Control unit identification number is displayed.
– 
          Press → key.

      		 
      
    
357 959 656                 AIRBAG IS 55

      

      

    
      

      

    
Indicated in display (function selection, e.g. 02 - Interrogate fault memory):
 
      Note
An overview of the possible functions will be printed out when the HELP key is pressed:

      		 
      
    
Rapid data transfer                 HELP
Select function XX                      

      

      

    
Overview of functionsPage
01 - Interrogate control unit version
02 - Interrogate fault memory
05 - Erase fault memory
06 - End output		 → Chapter
 → Chapter
 → Chapter
 → Chapter


      

      

    
Only the functions listed can at present be used for self-diagnosis.
When the →  key is pressed, the fault reader -V.A.G 1551- program will return to the start position.

      		 
      
     
      

      

    


Interrogating fault memory >
< Test prerequisites for self-diagnosis