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HOMESERVICE MANUALSAUDI1999A6 BASEREPAIR AND DIAGNOSISGENERAL INFORMATIONCOMPUTER RELEARN PROCEDURESLEXUSIGNITION KEY REGISTRATION (IMMOBILIZER EQUIPPED)
1999 Audi A6 Base

Ignition Key Registration (Immobilizer Equipped)

1999 Audi A6 BaseSECTION Ignition Key Registration (Immobilizer Equipped)
NOTE: This procedure MUST be performed only when NEW Engine Control Module (ECM) is installed. A new ECM is in automatic registration mode, and up to 3 ignition key identification codes may be registered in ECM at one time. In automatic registration mode, the last ignition key to be registered becomes the sub-key.
  1. Ensure SECURITY indicator light is flashing. SECURITY indicator light is located on center of instrument panel, just above the air outlets above radio.
  2. Insert ignition key into ignition lock cylinder. Note that SECURITY indicator light should now remain on steady.
  3. Once ignition key registration is under way, SECURITY indicator light should turn off. After ignition key registration is complete, SECURITY indicator light should come on steady. Remove ignition key.
  4. The SECURITY indicator light should flash when ignition key is removed from ignition lock cylinder if registration is complete and system is operating normally. If ignition key registration was not completed with ECM in automatic registration mode, a code 2-1 will be displayed by SECURITY indicator light. When inserting an ignition key that is already registered, code 2-2 will be displayed by indicator light.
  5. If programming additional ignition keys, repeat process starting with step 1)  . If additional ignition keys do not need programming, procedure is complete. SECURITY indicator light should go off once last ignition key (sub-key) is registered.
  6. To complete automatic registration mode, depress and release brake pedal at least 5 times within 15 seconds, or request automatic registration mode completion by using Toyota scan tool connected to Data Link Connector (DLC) No. 3.
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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.