General Information

Immobilizer
P1691 Immobilizer-Antenna Coil Error - General Information

Component Location





General Description

This wireless communication runs on RF (Radio frequency of 125 kHz). The antenna coil is mounted on the top of ignition lock for RF transmission and receiving. The RF signal from the transponder received by the antenna coil is converted into messages for serial communication by the SMARTRA device. And the received messages from the PCM are converted into an RF signal, which is transmitted, to the transponder by the antenna.

DTC Description

The PCM sets DTC P1691 if there's any fault in immobilizer antenna coil.

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.