Anti-Theft Immobilizer

Anti-Theft Immobilizer

General information
Passat models from m.y. 2000 are equipped with an anti-theft immobilizer system.

Immobilizer functions supported by:
- control electronics ("control module") integrated with instrument cluster
- a warning light for anti-theft immobilizer -K117-in instrument cluster (speedometer display)
- an adapted Engine Control Module (ECM)
- an induction coil on the ignition lock
- Adapted ignition keys with electronic components (transponder and response reader memory)

Malfunction recognition and Diagnostic Trouble Code (DTC) display via warning light for anti-theft immobilizer -K117-
An intact immobilizer system is indicated by the warning light for anti-theft immobilizer -K117- lighting up and going out after approx. 3 seconds when the ignition is switched on.

When the ignition is switched "on", the warning lamp flashes or lights up continuously to indicate a malfunction in the system when:
- Adapting the ignition key has been carried out incorrectly
- No transponder (response reader memory) is present in ignition key.
- An unauthorized ignition key is used.
- An unauthorized engine control module is detected.
- A malfunction in the induction coil of anti-theft immobilizer -D2-.
- A malfunction in the data wiring is present.

The warning light for anti-theft immobilizer -K117- does not light up after switching on ignition:
- The immobilizer control module has detected an authorized key.
- The immobilizer control module has not detected an incorrect engine control module.
- The immobilizer control module is currently "adapting keys" and after adapting the keys no malfunction has occurred.
- To troubleshoot, perform On Board Diagnostic (OBD) program and retrieve stored information with VAS 5051 Vehicle Diagnostic, Testing and Information System in mode "Guided Fault Finding"