Initial Inspection and Diagnostic Overview

Radio On Board Diagnostic (OBD), initiating program

Test requirements
- Fuse 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):

4B0035186A Radio D01
Coding 00017 WSC 06812

- 4B0035186A: Part No. for radio
- Radio: component designation
- D01: software version installed in radio
- Coding 00017: radio coding
- WSC 06812: dealership number

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.

Indicated on display

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+

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:
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