Number of the Registered Immobilizer Key (0 - 4 keys)
WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
The number of the transponder code in the transponder built in the ignition key that is registered with ECM.
NOTE:
A maximum of four transponder codes can be registered with ECM. Therefore, the maximal value should be 4.