Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSAUDI1999A8 QUATTROREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 72 (ON BOARD DIAGNOSTIC (OBD) - RADIO, NAVIGATION, STEERING & TELEMATICS)MULTI-FUNCTION STEERING WHEEL, ON BOARD DIAGNOSTIC (OBD)SAFETY PRECAUTIONSTEST REQUIREMENTS

1999 Audi A8 Quattro

Test requirements

1999 Audi A8 QuattroSECTION Test requirements

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

Check fuse for function according to wiring diagram.
Connect VAS5051 tester or VAG1551 scan tool. See VAS 5051 TESTER OR VAG 1551/1552 SCAN TOOL (ST), CONNECTING .
Switch on ignition.

NOTE:

If nothing is indicated on display, check voltage supply for VAG 1551 scan tool according to wiring diagram.
Additional instructions can be called up via the HELP button on the scan tool.
The --> button is used for advancing through the program sequence.
An incorrect entry can be canceled using the C-button.
Function 00 "Automatic test sequence" can be performed in operating mode 1 "Rapid data transfer". This automatically checks all control modules installed in the vehicle.

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

Indicated on display

Fig 1: VAG1551 Scan Tool Display - Initiating Multi-Function Steering Wheel On Board Diagnostic (1 Of 7)

Courtesy of AUDI OF AMERICA, INC.

Address word for steering wheel electronics: 16

Press buttons 1- and -6- to enter "Steering wheel electronics" address word 16.

Indicated on display

Fig 2: VAG1551 Scan Tool Display - Initiating Multi-Function Steering Wheel On Board Diagnostic (2 Of 7)

Courtesy of AUDI OF AMERICA, INC.

Press -Q- button to confirm input.

Indicated on display after approx. 5 seconds (example only):

Fig 3: VAG1551 Scan Tool Display - Initiating Multi-Function Steering Wheel On Board Diagnostic (3 Of 7)

Courtesy of AUDI OF AMERICA, INC.

Part number of steering wheel electronics
Steering wheel electronics: component marking
D03: Software version of control module
Coding 00101: Multi-function steering wheel control module coding
XXXXX: Workshop number

NOTE: Check/confirm coding using coding table. See CODE CONTROL MODULE (FUNCTION 07) .

Press --> button.

If one of these messages is displayed, perform trouble shooting according to troubleshooting diagnostic.

Fig 4: VAG1551 Scan Tool Display - Initiating Multi-Function Steering Wheel On Board Diagnostic (4 Of 7)

Courtesy of AUDI OF AMERICA, INC.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.