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Fault lamp lights briefly if an authorised vehicle key is being used.
The fault lamp flashes continuously when the ignition is switched on if an unauthorised vehicle key is used or
in the event of a system fault.
The electronic immobilizer is provided with comprehensive self-diagnosis. Fault codes are stored in the fault
memory of the immobilizer if faults occur in system components. Faults can be determined using the vehicle
diagnostic, testing and information system VAS 5051.
Immobilizer self-diagnosis can now only be implemented using the vehicle diagnostic, testing and information
system VAS 5051
For security reasons, the immobilizer PIN is encoded. The encoded number (PIN = Personal Identification
Number) is made up of 7 digits.
The PIN can only be used with the vehicle diagnostic, testing and information system VAS 5051 as of basic
CD version V02.00.
The 7-digit PIN must be obtained by way of the appropriate Regional Sales Centre/importer on the basis of the
14-position immobilizer/engine control unit identification number.
The 14-position immobilizer/engine control unit identification number can be read out with the self-diagnosis
function.
The PIN is only valid for one day, after which a new number has to be requested. The PIN is of no use to the
customer or other dealerships.
The 4- digit PIN can no longer be requested in countries in which the online and fax call procedure has been
switched to the 7-digit PIN.
Attention:
◆ Check data of vehicle diagnostic, testing and information system VAS 5051 with regard to Sales Centre/
importer and dealership number, as well as date and time.
◆ Immobilizer adaption function cannot be implemented with incorrect data.
Notes on use/matching of vehicle keys
The engine will only start if use is made of an authorised key, i.e. of a key matched to the immobilizer.
Vehicle key matching => Page 124 involves matching all vehicle keys, i.e. including spare and emergency
keys, to the immobilizer.
Matching must be performed for all vehicle keys if new or additional keys are required.
If, for any reason, e.g. loss of keys en route, it is not possible to perform matching for all vehicle keys, customers
are to be informed of the necessity of subsequent matching for all keys.
It is particularly important to re-match all the remaining vehicle keys if any have been lost to ensure that the
lost key is no longer authorised to start the vehicle.
4.3 - Starting immobilizer self-diagnosis
Requirements:
• Vehicle diagnostic, testing and information system VAS 5051 connected up and vehicle self-diagnosis se‐
lected => Page 1
• Ignition switched off for approx. 30 s and then back on again
Audi A3 1997 ➤
Electrical system Self-diagnosis - Edition 02.2002
114 01 - Self-diagnosis
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