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Chart of functions that can be selected > < Test prerequisites for self diagnosis

Passat (B3)

Heating, air conditioner
Self diagnosis of Climatronic
Connecting fault reader V.A.G 1551 and selecting function
 
N29-0002

→ With the ignition switched off, connect V.A.G 1551 using cable V.A.G 1551/3 to the diagnostic socket as follows:

  • ‒ Remove cover for diagnostic connections (in front of display panel right).
  • ‒ Connect fault reader using cable V.A.G 1551/3.
 
→ Indicated on display:
V.A.G self-diagnosis     HELP
1-Rapid data transfer*
2-Flash code output*

* Is displayed alternately.

Note:

If the display remains blank check V.A.G 1551 voltage supply using current flow diagram.

Notes:

  • ◆ Additional operating information can be printed out depending on the programme by pressing the HELP key of V.A.G 1551.
  • ◆ The ⇒key is used for advancing the programme sequence.
  • ◆ The PRINT key is used for switching on the printer (warning lamp in key lights up).
  • ‒ Switch on ignition.
  • ‒ Press key -1- for "Rapid data transfer" mode.
 
→ Indicated on display:
Rapid data transfer     HELP
Enter address word XX
  • ‒ Press keys -0- and -8- (08 inputs the address word of the vehicle system to be tested - "Air cond./Heating electronics").
 
→ Shown in display after input of address word 08:
Rapid data transfer    
Tester sends address word 08
 
→ Indicated on display:
Rapid data transfer     Q
08 Air cond./Heating electronics
  • ‒ Confirm entry with the Q key.

and then the display shows e.g.:

The control unit identification number is displayed:
     
    → Vehicles up to 07.95
    3A0 907 044     CLIMATRONIC     VXX
       
      → Vehicles from 08.95
      3A0 907 044A     CLIMATRONIC     VXX

      Note:
         
        → 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 does not answer!
         
        → (The ignition must be switched on!)
        Rapid data transfer     HELP
        K wire not switching to positive!
           
          → Faults have occurred at the start of or during the programme (external sources of faults?).
          Rapid data transfer     ⇒
          No signal from control unit!
             
            → Check diagnostic cables and also voltage supply and earth connection.
            Rapid data transfer     ⇒
            Fault in communication build-up
            • ‒ When causes of faults have been eliminated, input address word 08 for "Air cond./Heating electronics" and confirm with Q key.
             
            → Shown in display after input of address word 08:
            Rapid data transfer    
            Tester sends address word 08

            and then the following appears in the display:

            The control unit identification number is displayed:
               
              → Vehicles up to 07.95
              3A0 907 044     CLIMATRONIC     VXX
                 
                → Vehicles from 08.95
                3A0 907 044A     CLIMATRONIC     VXX
              • ‒ Press ⇒key.
                		•
                 
                → Indicated in display (function selection, e.g. 02 - Interrogating fault memory):
                Rapid data transfer     HELP
                Select function XX

                Note:

                A list of the possible functions is printed out after pressing the HELP key:

                Chart of functions that can be selected > < Test prerequisites for self diagnosis