![]() If the IPC/BCM receives the expected coded signal, the IPC/BCM will send a message over serial data to inform the PCM that the vehicle may be started. The cylinder then sends a coded signal to the instrument panel cluster (IPC) or body control module BCM. When the key is turned in the lock cylinder, the magnet creates a signal on the Hall effect sensor. The lock cylinder contains a stationary Hall effect sensor and a rotating magnet. The Passlock anti-theft system requires the presence of a key in the lock cylinder to enable starting. If the engine starts and runs, the relearn is complete.
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