Smartkey Module communicates with ECM through the serial communication line. If ECM requests authetication from Smartkey Module after IG ON, Smartkey Module check authentication with transponder then, sends this signal to ECM whether authentication is O.K or not.
Smartkey Module sets DTC B1625 if Data from ECM is error such as check sum error, Data Frame error, ID Unknown error, Data length error and Time out error.
Item
Detecting Condition
Possible cause
DTC Strategy
hecking Data stauts receiving from ECM
Poor connection
Power supply to Smartkey Unit(SMK IMMO Unit)
Communication open/ Short in ECM communication Line
Check noise at SMK communication Line coming from ECM
Smartkey Unit(SMK IMMO Unit)
ECM
Enable Conditions
Data receiving from ECM when IGN OFF to ON
Threshold value
Fault Data receiving from ECM
Diagnostic Time
DTC sets if ECM Data errors for 5 times