Initial Inspection and Diagnostic Overview

General information

Refer to safety precautions before diagnostics.

Technical features of radio system
The new generation of the Audi radio system has extensive On Board Diagnostic (OBD) capability.

All radio units have a Diagnostic Trouble Code (DTC) memory. If a malfunction occurs in one of the components or wires which is monitored by the system, a record of the type of malfunction is stored in DTC memory.

Radio On Board Diagnostic (OBD), initiating program

Test requirements
- Fuses OK per wiring diagram
- VAG1551 Scan Tool (ST) connected.
- Ignition switched on


NOTE:
- If the display remains blank, check the voltage supply of the VAG1551 Scan Tool (ST) according to the wiring diagram.
- Additional operating instructions can be printed out by pressing the HELP button.
- The -> button is used to advance through the program sequence.
- If an incorrect entry is made, press the -C- button to escape.
- In "Rapid data transfer" operating mode 1 the "Automatic Test Sequence" function 00 can be carried out. This checks DTC memory of all vehicle control modules (with OBD capability) automatically.


- Switch ignition on.
- Switch printer on by pressing PRINT button (indicator lamp in button lights up).
- Press button -1- to select "Rapid data transfer" operating mode 1.

Indicated on display


Rapid data transfer HELP
Insert address word XX


Address word for radio: 56

- Press buttons -5- and -6- to insert "Radio" address word 56.

Indicated on display


Rapid data transfer Q
56 - Radio


- Press -Q- button to confirm input.


NOTE: While the On Board Diagnostic (OBD) program is running "DIAG" will appear on the radio unit display.


- Indicated on display (after about 5 seconds)


4D0035195A Radio D0002 ->
Coding 00117 WSC 06812


- 4D0035195A: Part number of radio (e.g. Symphony US)
- Radio: component designation
- D0002: software version of radio
- Code 00117: Coding of radio
- WSC 06812: Dealership code


NOTE: Check coding against coding table.


- Press -> button.

- If display shows one of the following messages, carry out troubleshooting procedure as described in troubleshooting program for diagnostic wiring.


Rapid data transfer HELP
Control module does not answer


Rapid data transfer HELP
Error in communication link


Rapid data transfer HELP
K wire not switching to Ground


Rapid data transfer HELP
K wire not switching to B+


Indicated on display


Rapid data transfer HELP
Select function XX


After the HELP button is pressed, a list of the possible functions is printed out.

- Press -> button to advance through program sequence.

On Board Diagnostic (OBD) functions

The following functions are possible:

01 - Check control module version.
02 - Check DTC Memory.
03 - Output Diagnostic Test Mode (DTM).
05 - Erase DTC Memory.
06 - End Output.
07 - Code Control Module.
08 - Read Measuring Value Block.