Diagnostic AUDI A4 2000 B5 / 1.G Instrument Cluster OBD From Model Year 1999 Workshop Manual

01-1


Instrument cluster, On Board
Diagnostic (OBD) (through
M.Y. 1999)

General information


Instrument cluster technology
The Audi A4 instrument cluster is available in two
versions; the low-line version with "mini-check"
system and the high-line version with an LCD
multi-function display.
The mini-check system monitors the brake
system, Engine Coolant Temperature (ECT), fuel
level and engine oil pressure.
The multi-function display contains the following
functions:

Auto check system with radio station and
telephone displays
Ambient outside temperature display
On-board computer display
Transmission Range (TR) selector lever display
for automatic transmission
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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01-2
The speedometer contains a LCD display for the
odometer, a trip odometer and the Service
Reminder Indicator (SRI).
Indicator lamps are integrated in the
speedometer and tachometer.
Accessory instruments are integrated into the
instrument cluster.
The instrument cluster is controlled by a
microprocessor and has extensive On Board
Diagnostic (OBD) capabilities. If any component
exhibit signs of failure, a Diagnostic Trouble
Code (DTC) is stored in the instrument cluster
DTC memory. The DTC can then be identified
using the VAG1551 or VAG1552 Scan Tool
(ST).
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yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-3

Note:
The descriptions in this Repair Manual reference
the VAS5051 Diagnostic Operation Center
(DOC) and the VAG1551 Scan Tool (ST).
The following Adaptations (adjustments) can be
carried out using the tool:

Adaptation of the fuel sensor characteristics
Adaptation of the fuel consumption display
Coding the language versions for the on-board
computer and Auto Check system.
Adaptation of the Service Reminder Indicator
(SRI)
Adaptation of the odometer after instrument
cluster replacement.
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-5

On Board Diagnostic (OBD), initiating
program


Special tools, test equipment and auxiliary
items

VAS5051 Diagnostic Operation Center (DOC)
and/or VAG1551 Scan Tool (ST).
VAG1551/3 adapter cable

Test requirements
Fuses OK

Electrical Wiring Diagrams Troubleshooting &
Component Locations

Instrument cluster coding checked according
to coding table Page 01
-25


Connect VAS5051 Diagnostic Operation
Center (DOC) or
Connect VAG1551 Scan Tool (ST) Page 01
-241
.
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-9

On Board Diagnostic (OBD) functions
The following functions are possible:
02 - Check DTC Memory Page 01
-10

03 - Output Diagnostic Test Mode Page 01
-15


05 - Erase DTC Memory Page 01
-20

06 - End Output Page 01
-22

07 - Code Control Module Page 01
-23

08 - Read Measuring Value Block Page 01
-27


10 - Adaptation Page 01
-32

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e=re
pair&id=AUDI.B5.EE01.01.1

01-12
Diagnostic Trouble Code (DTC) table for instrument cluster

Notes:

The following table lists all possible Diagnostic Trouble Codes (DTCs) which the instrument cluster can recognize and
which the VAG1551 scan tool can print.
DTC numbers only appear on the printout.
Before replacing any component shown as malfunctioning, check all related wiring and connections of these components
and the Ground (GND) connections Electrical Wiring Diagrams Troubleshooting & Component Locations After the repair has been carried out and the functional system check, re-check and erase the DTC memory using the
VAG1551 scan tool.
The DTC memory records all static and sporadic (intermittent) malfunctions. A malfunction is considered static if it exists
for at least 2 seconds (exceptions: 60 seconds for outside temperature display and 30 minutes, for engine coolant sensor).
If the malfunction is not present after this time, it will be stored as a sporadic DTC and "/SP" will appear on the right side of
the scan tool display.
After switching the ignition on, all existing DTCs are set to sporadic. If they are still present after the system check, they
will be stored as static DTCs.
If a sporadic malfunction does not reoccur within 50 driving cycles (ignition on for at least 5 minutes and vehicle speed
greater than 30 km/h or 18 mph), it will be erased.
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-15

Output Diagnostic Test Mode (scan tool
function 03)


Notes:

Output Diagnostic Test Mode may only be
carried out on a stationary vehicle with the
engine off.
Trace any faults identified by the Output
Diagnostic Test Mode, replace the instrument
cluster if necessary.

The function "Output Diagnostic Test Mode"
cycles all the control elements in the
instrument cluster sequentially, if they are
installed and coded.
Concurrent testing of the display ranges of all
the analog indicators (coolant temperature
gauge, tachometer, speedometer and fuel
gauge).
Activation of the mini-check indicator lights.
Activation of the seat belt warning lamp.
Activation of the chime.
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01-16

Notes:

The instrument cluster lighting test can only be
carried out with the lights on.
The coolant excess temperature test activates
the A/C compressor safety shut-off.

Initiating Output Diagnostic Test Mode

Note:
The units displayed are country specific.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
Rapid data transfer
Q
03 - Output Diagnostic Test Mode

Indicated on display
- Press -Q- button to confirm input.
This will start the Output Diagnostic Test Mode for the analog
instruments (displays).
Output Diagnostic Test Mode Analog Indicators

Indicated on display
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01-18

-
Press button.Output Diagnostic Test Mode Instrument Cluster Warning Lights Test

Indicated on display
Activation of mini-check indicator lights
-
Press button.
Output Diagnostic Test Mode Seat Belt Warnin
g Light-K19

Indicated on display
Activation of seat belt warning light.
Note:
Depending on the model/equipment, the seat belt warning light will be
activated via the control module coding. This means that the warning light
will be inactive if this test is skipped.
-
Press button.
Output Diagnostic Test Mode Chime

Indicated on display
The chime is activated and sounds continuously.
-
Press button.
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01-19

Output Diagnostic Test Mode Segment test

Indicated on display
Notes:
All indicators on the multi-function display and/or the LCD odometer
are cycled. All segments on the multi-function monitor light up and one bar
remains dark.
-
Press button.
Output Diagnostic Test Mode Switch and instrument li
ghtin
g

Indicated on display
The instrument cluster dimming is tested.
-
Press button.
Output Diagnostic Test Mode ECT Overheat Test

Indicated on display
The A/C compressor safety cut-out will be activated within approx. 5
seconds.
-
Press button.
Output Diagnostic Test Mode END

Indicated on display
This returns the scan tool to the "Select function XX" prompt. -
Press button to end Output Diagnostic Test Mode.
Rapid data transfer
HELP

Indicated on display
Pa
ge 24 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1