Alarm Module: Description and Operation

Vehicles with steering column mounted ignition switches have the exciter integral with the theft deterrent controller module which is located within the steering column. Vehicles with instrument panel mounted ignition switches have exciter modules separate from the theft deterrent controller module with the vehicle wiring harness connecting the two. The theft deterrent controller module for vehicles with instrument panel mounted ignition switches is located within the instrument panel.

The theft deterrent controller module can learn up to ten keys (transponder values).

The theft deterrent controller module provides the signal to the exciter which energizes the transponder within the key. It also receives and verifies the transponder signal value. When the theft deterrent controller module has verified that the transponder signal value matches the value of a learned key. it sends an enable password to the PCM via the class 2 serial data line. If the transponder value is not correct, it sends a disable password to the PCM.