Component Location
General Description

The relevant data for the immobilizer function are stored at permanent memory (EEPROM or Flash etc.).

The immobilizer data are stored by three independent entries.

The data from EEPROM are evaluated by "2 of 3 decision“. That means all three entries are read and the content is compared before authentication process.

If the contents of all entries are equal, the authentication will run without additional measures.

If only the contents of two entries are equal, the authentication will run and fault code "EEPROM defective“ is stored at ECM.

If the contents of all three entries are different from each other, no authentication will be possible and the fault code "EEPROM defective“ will be stored. The limp home function cannot be activated. The ECM shall be replaced if the EEPROM related fault occurs again after new teaching of all keys.

DTC Description

The ECM sets DTC P1695 if there's any fault in ECM internal permanent memory. (EEPROM or Flash etc.)

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

­-

1.

faulty ECM

Enable Conditions

•

IG ON

Threshold value

•

Inconsistent data of EEPROM

•

Invalid write operation to EEPROM

Detecting time

•

-

Fail Safe

•

-

Diagnostic Circuit Diagram
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Signal Waveform & Data

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

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