IMMOBILIZER CONTROL SYSTEM
BE -249
DTC P1674 TRANSPONDER STATUS ERROR
COMPONENT LOCATION
E16E69B2
Transponder
SCMBE6750L
GENERAL DESCRIPTION
E41DDC6B
During the key teaching procedure the transponder will be programmed with vehicle specific data. The vehicle specific
data are written into the transponder memory. The write procedure is unique; therefore the content of transponder can
never be modified or changed. The data are a string of 9 bytes defined by vehicle manufacturer.
The transponder memory is split into two strings called authenticator and key password After this programming the
transponder memory is locked and the data(PIN code) cannot be read or changed respectively. The transponder status
changes from "virgin" to "learnt". Additionally every transponder includes a unique IDE (Identifier number) of 32 bit.
Unique means that the IDE of all transponder is different from each other. The IDE is programmed by the transponder
manufacturer and is a read-only value. The authenticator and the key password are not transferred from ECM to transpon-
der or vice versa. Only the results from the encryption algorithm are transferred. It is almost impossible to calculate the
vehicle specific data from the encryption result.
For teaching of keys and special purposes the ECM is connected to the tester device.
When IG is ON, the coil supplies energy to the transponder which in turn accumulates energy in the condenser.
Once the energy supply from the coil has stopped, using the stored energy in the condenser, the transponder transmits
the ID CODE (stored within the ASIC).
DTC DESCRIPTION
E4CEBDC2
The ECM sets DTC P1674 if transponder key that can’t be register(TP not in the password mode or whose transport data
has been changed) is inserted for registration procedure.
DTC DETECTING CONDITION
ED14DFB8
Item
Detecting Condition
Possible Cause
DTC Strategy
Enable Conditions
• IG ON (On Registering TP Procedure)
Threshold value
Detecting time
FAIL SAFE
• Invalid transponder.
※ Key not in ’VIRGIN’
Status or with invalid
ID code