General Information

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 or VAS 5052 Vehicle Diagnostic and Service System in mode "Guided Fault Finding"