General Information

Immobilizer
P1689 Immobilizer - Unregistered Transponder - General Information

Component Location





General Description

The vehicle immobilizer system consists of the PCM, the SMARTRA3 and ignition keys with built-in transponder.
The PCM carries out the check of ignition key by special encryption algorithm with SMARTRA3 and Transponder.
The encryption algorithm(between PCM and SMARTRA3) is the one offered from BOSCH.
The encryption algorithm(between PCM and Transponder) is Hitag type 2 which is a high level system. With IGN On, the PCM executes the key Authentication after SMARTRA3 authentication. The Engine can be started when the key authentication is confirmed by the SMARTRA3.
The Key teaching procedure starts with PCM request of PIN from Scanner. The "virgin" PCM stores the PIN and the key Learning can be started. The "learnt" PCM compares the PIN from tester with the vehicle password in Transponder. If the data are correct, the key Learning can be started.
Scanner requests the Learning of the first key, the SMARTRA3 is registered at first and then the first key is registered by PCM. If the SMARTRA3 status is learnt and PIN number is different, the SMARTRA3 will return the incorrect PIN data to the PCM. In this case, The PCM can't excute the key learning process.

DTC Description

The PCM sets DTC P1689 if invaild key is inserted into key hole for Authentication.

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal Waveform & Data




Fig.1) A normal signal waveform of antenna and immobilizer communication when IG key(TP : Transponder) is OFF to ON.