CEL has nothing to do with Immobiliser, - if key mismatch car not start or it will shut down in under 45 seconds at release of clutch
goto suzuku 3S shop or some other workshop with scanner pull the code and check whats' wrong. try not to reset CEL by removing battery terminals you may end up with a DEAD CAR.
@margallar @rustam54 @ser_gtr @syncview