General Information

Smart Key Code Saving
P1696 Immobilizer-Authentication Fail - General Information

Component Location




1. Smartkey Module
2. ECM/PCM

General Description

Smart key System consists of transponder, which is in the FOB key head, and Smart key ECM/PCM. Smart Key System has FOB holder, which includes antenna coil, to communicate with transponder for immobilizer communication.
Smart Key ECM/PCM communicates with PDM via serial communication line so that Smart Key ECM/PCM sends signal to PDM.
FOB is requested authentication from Smart Key ECM/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 ECM/PCM sends authentication signal to Engine ECM/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 Immoblizer 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 padel when FOB is in passenger compartment
Condition for general authentication
1. Pressing start butteon when FOB is in the passenger compartment

DTC Description

During the Immobilizer authentication, If there is any wrong VIN(Vehicle Identification Number) or MIN(Model Identification Number) signal on the communication message, ECM sets DTC P1696

DTC Detecting Condition





Diagnostic Circuit Diagram