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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 337 (Hybrid Vehicle Immobilizer System) >> Hybrid Vehicle Immobilizer System >> Hybrid Vehicle Immobilizer System Registration Procedure >> Step 1 - Communication Between Hybrid Vehicle Control ECU And Transponder Key ECU Is As Follows

Step 1 - Communication Between Hybrid Vehicle Control ECU And Transponder Key ECU Is As Follows

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. When the ignition is turned ON, the transponder key ECU checks if the key is pre-registered or not and sends the check result to the hybrid vehicle control ECU.
  2. When the hybrid vehicle control ECU confirms that the key is pre-registered, it transmits its own ID (random numbers) to the transponder key ECU.
  3. Receiving the ID, the transponder key ECU calculates internally and sends the calculated result back to the hybrid vehicle control ECU.
  4. The hybrid vehicle control ECU rechecks the calculation inside the ECU.

    When the calculation result corresponds to its own ID, this enables the engine to start.

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