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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 79 (Smart Key Code Saving Diagnosis (HEV)) >> DTC P1696: Immobilizer Authentication Fail >> General Information >> General Description

General Information: General Description

WARNING: This page is about a different variant/trim than selected.

Smart key System consists of transponder, which is in the FOB key head, and Smart key PCM. Smart Key System has FOB holder, which includes antenna coil, to communicate with transponder for immobilizer communication.

Smart Key PCM communicates with PDM via serial communication line so that Smart Key PCM sends signal to PDM.

FOB is requested authentication from Smart Key PCM by using the LF antenna with LF communication. And then, FOB sends authentication signal through the SRx with RF communication.

With this procedure, Smart Key PCM sends authentication signal to Engine PCM in order to allow the engine start.

Authentication for immobilizer is classified two different way. one is pre-authentication and the other is general authentication.

Regardless of success or failure, Pre-authentication makes Immobilizer lamp remains OFF. However, General authentication makes Immobilizer lamp is ON for 30 seconds If authentication is successful. However, if authentication is failed, Immobilizer lamp is OFF for 10 seconds.

Condition for Pre-authentication. 

  1. OFF and Driver door is open when FOB is in passenger compartment.

    (Seek every 3 seconds for 30 seconds.)

  2. OFF and Driver door is close when FOB is in passenger compartment.
  3. FOB is inserted in FOB Holder.
  4. Pressing Brake pedal when FOB is in passenger compartment.

Condition for general authentication 

  1. Pressing start button when FOB is in the passenger compartment.
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