P1610, Lock Mode, is a bit tricky. It means you tried to start the car 5 or more consecutive times with either a bad key or a malfunctioning BCM or ECU. Once the problem is corrected, you need to perform the following procedure to escape from the lock mode:
1. Turn ignition switch OFF.
2. Turn ignition switch ON with a registered key. (Do not start the engine.) Wait 5 seconds.
3. Return the key OFF. Wait 5 seconds.
4. Repeat steps 2 and 3 twice (total of three cycles).
5. Start the engine.
This procedure comes from the US Service Manual, Body, Lock and Security System section.