Transceiver Module
WARNING: This page is about a different car, the 1999 Mazda B4000, 1999 Mazda B3000, and 1999 Mazda B2500. However, it is still accessible from the selected car via links, so may be relevant.
Transceiver module communicates with encoded ignition key. During each starting sequence, the transceiver module reads the encoded ignition key identification code and sends the data to the PATS module.