ignition AUDI A4 1999 B5 / 1.G Radio OBD Workshop Manual

01-2

Radio On Board Diagnostic (OBD),
initiating program


Test requirements

Fuse OK per wiring diagram

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

VAG1551 Scan Tool (ST) connected page 01
-108


Ignition switched on

Notes:
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.
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01-3

- 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. Rapid data transfer
HELP
Insert address word XX

Indicated on display
Address word for radio: 56
- Press buttons -5- and -6- to insert "Radio" address word 56.
Rapid data transfer
Q
56 - Radio

Indicated on display
Note:
While the On Board Diagnostic (OBD) program is running "DIAG" will
appear on the radio unit display. - Press -Q- button to confirm input.
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p://127.0.0.1:8080/audi/servlet/Dis
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01-8

No DTC recognized!

If "No DTC recognized" is displayed the program will return to the starting
point ("Select function XX" prompt) after the button is pressed.
Rapid data transfer
HELP
Select function XX

Indicated on display
If anything else is displayed:
Scan Tool operating instructions - End output (function 06) page 01
-18
.
- Switch ignition off and disconnect connections from Data Link
Connector (DLC).
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01-9
Diagnostic Trouble Code (DTC) table for radio system

Notes:

The following table lists all the malfunctions (stored as Diagnostic Trouble Codes, or DTCs) that can be recognized by the
radio system and printed out by the VAG1551 Scan Tool (ST). The DTCs are listed in order according to their 5-digit
numbers.
The DTCs only appear on the print-out from the scan tool.
Before replacing a component shown as faulty, check the wiring and connections to the component as well as Ground
(GND) connections according to the wiring diagram.
When a repair has been carried out, the DTC memory must always be checked again and then erased using the
VAG1551 scan tool.
Static and sporadic malfunctions are stored as DTCs in the DTC memory. If a malfunction occurs and persists for at least
2 seconds, it is identified as a static malfunction. If the malfunction does not occur again it is registered as a sporadic
malfunction and "/SP" will appear at the right of the display.
When the ignition is switched on, all existing malfunctions are automatically re-classified as sporadic malfunctions and will
only be registered as static malfunctions if they still occur after testing.
Sporadic malfunctions which no longer occur after 50 driving cycles (ignition on for at least 5 minutes, road speed of more
than 30 km/h or 19 mph) are erased automatically.
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.EE02.01.1

01-10

DTC
Possible cause
Corrective action
VAG1551 Scan Tool display
00668
Battery Positive Voltage (B+)
Term. 30

Signal too low
Battery discharged or faultyShort circuit in vehicle electrical
system - Charge or replace battery.
- Repair short circuit in vehicle electrical system.
00849
S Contact on Ignition Starter
Switch

Open circuit
Ignition/starter switch -D- faultyOpen circuit in wiring
Electrical Wiring Diagrams, Troubleshooting &
Component Locations - Replace ignition/starter switch -D-.
- Trace malfunction using wiring diagram.
00850
Control Output Active, Radio
Amplifier

Short circuit to Ground
Wiring damagedActive amplifier faulty
Electrical Wiring Diagrams, Troubleshooting &
Component Locations - Trace malfunction using wiring diagram.
- Replace active amplifier.
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.EE02.01.1

01-18

End Output (scan tool function 06)


- Press buttons -0- and -6- to select "End Output"
function 06.
Rapid data transfer
Q
06 - End Output

Indicated on display
- Press -Q- button to confirm input.
Rapid data transfer
HELP
Insert address word XX

Indicated on display
- Switch ignition off.
- Disconnect VAG1551 Scan Tool (ST) from Data Link Connector (DLC).
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p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.EE02.01.1

01-27
Display group 001

Read Measuring Value Block 1

Indicated on display

0 12.3 V 60 % ON


S-contact status
Can be checked while measuring values are being displayedIgnition key withdrawn: display reads "OFF" S-contact reactivated: display reads "ON"



Dimming level of radio illumination in percent (only with light "ON")
0-99%

Battery Positive Voltage (B+), terminal 30
(measurement taken after electrical filter)

Vehicle speed signal from speedometer
0 or 1 (4 impulses per wheel revolution)

Pa
ge 29 of 34 Radio, On Board Dia
gnostic
(OBD
) (m.
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11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE02.01.1