No resistor in a H3 key, the resistor circuit is in the ignition module's passlock sensor. The system senses a correctly cut and grooved ignition key has been inserted, and when the switch is turned the passlock controller sends the a signal to the BCM. The BCM sees the correct signal and triggers the PCM to allow the fuel to flow, ignition to spark, and engine to start.
Older passlock systems did use a resistor, it was quite noticeable. Looked like a little black square wart on both sides of the key.
Dealer did just what dealers do, charge customers full price for the part.
