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Interrogating control unit version > < Starting self-diagnosis of radio systems

A4 Mk1

Radio, Telephone and Navigation System - Self-diagnosis
Self-diagnosis of radio systems (vehicles from 1998)
Safety precautions

Pay attention to the following if testers and measuring instruments have to be used in the course of a test drive:

Attention:
  • ◆ Proceed as follows during measurement and test drives so as to avoid the risk of accident:
  • ◆ Exclusive use is to be made of VAS 5051 or V.A.G 1551 for reading the measured value blocks. The devices must be attached to the rear seat and operated from there by a second person.
  • ◆ Deactivate front passenger's airbag by way of key switch in glove box or using self-diagnosis => Body Self-diagnosis; Repair Group 01; Adaption: Activating and deactivating front passenger's airbag unit.
  • ◆ Re-activate front passenger's airbag on completion of work.

Heed the following so as to avoid possible injury and/or the destruction of electrical and electronic components:

  • ◆ Switch off ignition before disconnecting and connecting measuring instruments and testers.
  • ◆ Certain tests may lead to a fault being detected by the control unit and stored. The fault memory is therefore to be interrogated and if necessary erased on completion of all tests and repair work.
  • ◆ Always switch off ignition before disconnecting and connecting battery so as not to damage gearbox control unit.

Test requirements:

  • ◆ Use current flow diagram to check that fuse is OK.
  • ◆ Connect up vehicle diagnostic, testing and information system VAS 5051/fault reader V.A.G 1551 .
  • ◆ Switch on ignition.

Notes:

  • ◆ If no display appears, use current flow diagram to check power supply for V.A.G 1551.
  • ◆ Additional operating instructions can be called up by pressing the fault reader HELP key.
  • ◆ Next step in program sequence can be selected by pressing ⇒ key.
  • ◆ Incorrect entries can be terminated by pressing C key.
  • ◆ Function 00 "Automatic test sequence" can be implemented in mode 1 "Rapid data transfer". This involves automatic interrogation of all vehicle control units.
  • ‒ Switch on ignition.
  • ‒ Switch on printer by pressing PRINT key (lamp in key lights).
  • ‒ Press key 1 for "Rapid data transfer" mode.
 
→ Indicated on display:
Rapid data transfer    HELP
Enter address word XX

Address word for radio: 56

  • ‒ Press keys 5 and 6.
 
→ Indicated on display:
Rapid data transfer    Q
56 - Radio
  • ‒ Confirm entry with Q key.

Note:

During self-diagnosis, "DIAG" appears on radio display and also on secondary display in instrument cluster in the case of "Highline" dash panel insert.
 
→ Adjacent display appears after approx. 5 s:
8D0035195    Radio    D01    ⇒
Code 00207    WSC 06812
  • ‒ 8D0035195: Part number of radio
  • ‒ Radio: Component designation
  • ‒ D01: Software version installed in radio
  • ‒ Code 00207: Code for radio
  • ‒ WSC 06812: Workshop code

Note:

Check code against encoding table .

  • ‒ Press ⇒ key.
 
→ If one of the adjacent messages appears on the display, perform fault-finding in line with fault-finding program for diagnostic wire.
Rapid data transfer    HELP
No control unit response
 
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Rapid data transfer    HELP
Fault in communication link
 
Rapid data transfer    HELP
K-wire not switched to earth
 
Rapid data transfer    HELP
K-wire not switched to positive
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Pressing HELP key prints out a list of possible functions.
  • ‒ Press ⇒ key to select next step in program sequence.

Self-diagnosis functions

Possible functions:

01 - Interrogate control unit version => Page 01-10

02 - Interrogate fault memory => Page 01-11

03 - Final control diagnosis => Page 01-20

05 - Erase fault memory => Page 01-22

06 - End output => Page 01-24

07 - Encode control unit=> Page 01-25

08 - Read measured value block => Page 01-31

Interrogating control unit version > < Starting self-diagnosis of radio systems