Anti-theft immobilizer On Board Diagnostic (OBD), initiating

Additional information

Scan Tool (ST) and test equipment safety precautions

WARNING:

Due to weight, size and need for manual operation of test instruments while vehicle is driven on public roads, instrument must be used only with a Driver operating the vehicle and an Instrument Operator operating the test equipment.
Do not use Instrument with Driver only. Always use two persons to conduct test.
Do not place Instrument on lap of Driver or front seat passenger because emergency stop may dislodge Instrument and cause airbag deployment with risk of injury to Instrument Operator.

WARNING:

Use of Instrument in Audi TT Coup:

Place Instrument in rear seating area and secure by available safety belt.
Instrument Operator must be seated in the other rear seating position, after sliding front passenger seat and moving the seat back as far forward as possible. Do not activate the seat back release lever.
Instrument Operator must wear safety belt.

Use of Instrument in Audi TT Roadster:

Use only Instrument VAG 1551 Scan Tool (ST) or VAS 5052 Vehicle Diagnostic and Service System. DO NOT USE VAS 5051.
Before test, deactivate passenger's airbag using key operated switch in glove compartment.
Instrument Operator must be seated on passenger seat with safety belt worn.
Place Instrument in foot well in front of passenger seat in a manner allowing the Operator to use the Instrument in a safe manner.

CAUTION:

To prevent damage to electronic and electrical components, note the following:

Always switch off the ignition before connecting or disconnecting test instruments.
During some of the tests the control module may identify and record DTCs. The Diagnostic Trouble Code (DTC) memory should therefore be checked and (if necessary) erased after completing the tests and any repair work that may be required.

Test requirements

Check fuses using wiring diagram. Refer to Wiring Diagrams
Connect VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System. Refer to VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions
Ignition switched on

NOTE:

If the display remains blank, check voltage supply of VAG 1551 according to wiring diagram.
Additional operating instructions can be called up with the scan tool HELP button.
The → button serves to advance the program sequence.
If an incorrect entry is made, press button C to escape.
In the operating mode 1 "Rapid data transfer" the function 00 can be used to perform an "Automatic test sequence." This will check all control modules in the vehicle automatically.

Procedure

Fig 1: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051/5052:

Press selection -1- of vehicle system "17 - instrument cluster" (instrument panel insert).

NOTE: Because the immobilizer is integrated in the instrument cluster, the same address word must be used as for the instrument cluster.

NOTE: Confirm instrument cluster is coded according to market and equipment level. Refer to Code Control Module (function 07)

Fig 2: VAS 5051 Tester Displaying Control Module Identification And Coding

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051/5052:

1 - Control module identification of instrument cluster

2 - Control module identification of immobilizer

Immobilizer Control Module Identification, (examples only)
TRUUT28NX111234561) AUZ5Z0W10000712)	1) 2)	17 digit VIN (Vehicle Identification Number) 14-digit identification number of immobilizer

Fig 3: Diagnostic System VAS 5051: Display -- Basic Setting

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051/5052:

1 - Selection of diagnostic functions:

Diagnostic functions		Section
02	Check DTC Memory	Check DTC memory
05	Erase DTC Memory	Diagnostic Trouble Code (DTC) Memory, erasing (function 05)
06	End Output	End Output (function 06)
08	Read Measuring Value Block	Read measuring value block
10	Adaptation	Adaptation
11	Login Procedure	Login Procedure (function 11)