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Ignition Switch: General Description: Operation

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
  1. When the ignition switch is turned to "ON" position, the ECM < M/T > or PCM < A/T > sends a requirement for the encrypted code to the immobilizer-ECU (at this time, the engine is remobilized).
  2. When the immobilizer-ECU receives the requirement from the ECM < M/T > or PCM < A/T >, the immobilizer-ECU supplies power to the transponder inside the ignition key via the antenna. The energized transponder sends the encrypted code back to the immobilizer-ECU via the antenna.
  3. The immobilizer-ECU judges the encrypted code with its code logic in itself. If they are identical, the immobilizer-ECU sends the encrypted code to the ECM < M/T > or PCM < A/T >.
  4. If the ECM < M/T > or PCM < A/T > can not receive the encrypted code, the engine will be immobilized.
    Fig 1: Operation Diagram - Ignition Switch
    G04538830Courtesy of DAIMLERCHRYSLER CORPORATION
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