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Final control diagnosis > < Self-diagnosis RNS with MFD

Polo Mk3

Radio, telephone, navigation
Self-diagnosis of Radio/Navigation system (RNS) with multi-function display (MFD)
Self-diagnosis of radio part in RNS with MFD

Check prerequisites:

  • ◆ All fuses according to current flow diagram OK.
  • ◆ Supply voltage OK. (at least 9.5 V).
  • ◆ Fault reader V.A.G 1551 or V.A.G 1552 connected.

Connecting fault reader .

  • ‒ Switch on ignition.
  • ‒ Switch on printer with the Print key (indicator lamp in key lights up).
  • ‒ Press key 1 for "Rapid data transfer" mode.
 
→ Indicated on display:
Rapid data transfer     HELP
Input address word XX
  • ‒ Press keys 5 and 6. "56" enters the address word "Radio".
 
→ Indicated on display:
Rapid data transfer      Q
56 Radio
  • ‒ Confirm entry with Q key.
 
→ Indicated on display:
Rapid data transfer      Q
Tester sends address word 56

Interrogate radio version
 
→ Indicated on display:
3B0035196 C     Radio     0001 ⇒
Coding     01407     WSC     00000
  • ◆ Upper line     Unit version number of
              radio part in RNS housing                    System designation
              (Radio)                         Software version number
  • ◆ Lower line     Code number                    Dealership number1)

1)- Will be automatically stored in the radio unit when entering the system.

Indicated on display of radio/navigation system during self-diagnosis: "DIAG".

Notes:

  • ◆ Radio part and navigation part of the Radio/Navigation system have different unit version numbers.
  • ◆ The displayed unit version number is not the part number for the complete Radio/Navigation system.
  • ◆ The part number for the complete Radio/Navigation system is printed on a sticker on the radio/navigation system housing!
  • ‒ Press ⇒ key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
 
→ Will be indicated on display:
Control unit does not answer!     HELP
  • ‒ By pressing the "HELP" key a list of possible fault causes is printed out.
  • ‒ After rectifying faults, enter address word 56 for radio again and confirm with Q.
 
→ Indicated on display:
3B0035196 C     Radio     0001 ⇒
Coding     01407     WSC     00000
  • ‒ Press ⇒ key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ After the HELP key is pressed, a list of the possible functions is printed out.

List of selectable functions

01 -

Interrogate radio unit version

01-44

02 -

Interrogate fault memory

01-46

03 -

Final control diagnosis

01-56

05 -

Erase fault memory

01-48

06 -

End output

01-49

07 -

Code radio functions

01-59

08 -

Read measured value block

01-62

Notes:

  • ◆ Do not select further functions, which can be printed out after pressing the HELP key.
  • ◆ After the function is completed the V.A.G 1551 returns to the following start position:
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX

Interrogating fault memory

Note:

The displayed fault information is not constantly up-dated, but only when initiating the self-diagnosis or with the function 05 "Erase fault memory".

  • ‒ Switch on printer with the Print key (indicator lamp in key lights up).
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Press keys 0 and 2. (The function "Interrogate fault memory" is selected with 02.)
 
→ Indicated on display:
Rapid data transfer     Q
02 - Interrogate fault memory
  • ‒ Confirm entry with key Q.
 
→ The number of stored faults appears in the display.
X faults recognized!    

The stored faults are displayed and printed out one after another.

  • ‒ Enter fault table at fault printed out and rectify fault => Page 01-50 .
 
→ If "No fault recognised" is displayed the programme will return to the start point after pressing ⇒ key.
No fault recognized!     ⇒
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX

If something else is displayed:

=> Fault reader operating instructions

  • ‒ End output (function 06) => Page 01-49 .
  • ‒ Switch off ignition and separate diagnostic connections.

Erasing fault memory

Note:

After erasing the fault memory its contents will automatically be indicated. If the fault memory cannot be erased, interrogate fault memory again and rectify faults.

Prerequisites

  • ◆ Fault memory interrogated .
  • ◆ All faults repaired.

After fault memory has been successfully interrogated:
 
→ Indicated on display:
Rapid data transfer      HELP
Select function XX
  • ‒ Press keys 0 and 5. (05 selects the "Erase fault memory" function.)
 
→ Indicated on display:
Rapid data transfer      Q
05 Erase fault memory
  • ‒ Confirm entry with key Q.
 
→ Indicated on display:
Rapid data transfer     ⇒
Fault memory is erased!

The fault memory is now erased.

  • ‒ Press ⇒ key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX

Notes:
     
    → If this appears in the display, the test sequence is faulty.
    Warning!    
    Fault memory was not interrogated
       
      → If this appears in the display, the test sequence is faulty.
      Rapid data transfer     ⇒
      Fault memory was not interrogated

      Adhere exactly to test sequence: First interrogate fault memory, if necessary repair faults, then erase.

      Ending output

      • ‒ Press keys 0 and 6. (The function "End output" is selected with 06.)
       
      → Indicated on display:
      Rapid data transfer     Q
      06 End output
      • ‒ Confirm entry with key Q.
       
      → Indicated on display:
      Rapid data transfer     Help
      Enter address word XX
      • ‒ Switch off ignition.
      • ‒ Disconnect fault reader V.A.G 1551.

      Fault table

      Notes:

      • ◆ The following table lists all the faults, with the corresponding 5 digit code numbers, that can be recognized by the radio/navigation system and printed out by the V.A.G 1551.
      • ◆ Fault codes appear only on print-out.
      • ◆ Before replacing components, check the wiring and connections to these components as well as the earth connections, according to current flow diagram.
      • ◆ When repair has been carried out, the fault memory must always be interrogated again with the fault reader V.A.G 1551 and erased.

      V.A.G. 1551 print out

      Possible fault cause

      Possible effects

      Fault elimination

      00668

      Vehicle voltage terminal 30

      Signal too weak*
      * This fault can also be stored if the starter was operated for more than 10 seconds.

      Battery voltage below 9.5 Volt
      Battery insufficiently charged
      Battery defective
      Alternator defective

      Radio part does not function or function is poor

      - Read measured value block
      => page 01-62
      Check battery, charge if necessary
      => Electrical system, Repair group 27
      Check alternator
      => Current flow diagrams, Electrical fault finding and Fitting locations binder

      V.A.G. 1551 print out

      Possible fault cause

      Possible effects

      Fault elimination

      00849

      S contact on ignition/starter switch - D

      Open circuit

      Ignition/starter switch not OK.
      Wiring not OK.
      Radio/Navigation system not OK.

      Radio does not automatically switch on when ignition is switched on, even though radio was switched on when ignition was last switched off.
      With radio switched on and ignition switched on, radio switches off automatically after 1 hour.

      - Read measured value block
      Check wiring using current flow diagram
      Check ignition/starter switch, renew if necessary

      V.A.G. 1551 print out

      Possible fault cause

      Possible effects

      Fault elimination

      00852

      Front loudspeaker

      Short circuit


      Open circuit

      Front speaker wiring short to wiring or short to earth or short circuit in loudspeaker coil
      Front bass speaker wiring opening circuit or open circuit in loudspeaker coil

      One front loudspeaker not functioning


      One front bass loudspeaker not functioning

      - Perform final control diagnosis => page 01-62
      Check wiring using current flow diagram
      Renew defective loudspeaker

      V.A.G. 1551 print out

      Possible fault cause

      Possible effects

      Fault elimination

      00853

      Rear loudspeaker

      Short circuit


      Open circuit

      Rear speaker wiring short to wiring or short to earth or short circuit in loudspeaker coil
      Rear speaker wiring opening circuit or open circuit in loudspeaker coil

      One rear loudspeaker not functioning


      One rear loudspeaker not functioning

      - Perform final control diagnosis => page 01-62
      Wiring check using current flow diagram
      Renew defective loudspeaker

      V.A.G. 1551 print out

      Possible fault cause

      Possible effects

      Fault elimination

      00855

      Connection to CD changer

      No communication

      Wiring to CD changer defective
      CD changer/CD player defective
      Radio defective

      CD changer/CD player function not OK.

      - Read measured value block => page 01-62
      Check wiring using current flow diagram
      Renew CD changer/CD player
      Renew radio/navigation system

      V.A.G. 1551 print out

      Possible fault cause

      Possible effects

      Fault elimination

      00856

      Aerial (radio)

      Short circuit
      Open circuit

      Aerial wire defective
      Aerial wire not connected
      Aerial defective

      No or poor radio reception

      - Read measured value block => page 01-62
      Check aerial wire
      Check wiring using current flow diagram
      Check aerial

      01044

      Control unit incorrectly coded

      Radio/navigation system not coded

      Radio functions or sound not OK.
      Incorrect fault entry in fault memory

      - This fault message cannot be erased.
      Coding radio/navigation system => Page 01-59

      65535

      Control unit defective

      Radio/navigation system defective

      Radio/navigation system function not OK.

      - Renew radio/navigation system

      During the fault diagnosis it is not possible to recognize if a fault exists after fault rectification.

      Therefore after each fault rectification and erasure of the fault memory it is necessary to interrogate the fault memory again.

      Final control diagnosis > < Self-diagnosis RNS with MFD