Lonsdor 3370B 314.35MHz Toyota 4D Smart Key PCB

A smart key PCB (Printed Circuit Board) is the internal electronics of a modern Toyota/Lexus key fob. It includes:

• Buttons (lock/unlock/trunk/panic) that send RF to the car.

• Transponder circuit (often 4D encryption) that wakes the car’s immobilizer so the engine can start.

• RF transmitter at a specific frequency (314.35 MHz in your model).

This board is intended to be installed in a key shell and then programmed with a key programming tool (e.g., Lonsdor or other automotive key programmers) to match your vehicle’s immobilizer.