Theft Deterrent Module

The theft deterrent module contains the software in order to perform the following actions:
^ Monitor the inputs for the PASS-key(R) II system.
^ Control the outputs for the PASS-key(R) II system.

The following circuits are the theft deterrent module inputs:
^ The battery voltage (CKT 1642, RED) input to the module draws about 1 milliamp when the ignition is OFF.
^ The ignition voltage (CKT 1020, PNK) input (Buick) is used in order to wake up the module. When you turn the ignition switch to the RUN position, the module continuously measures the ignition key resistor. When the ignition switch is in OFF, LOCK, or ACCY, the module does not measure the ignition key resistor.
^ The ignition voltage (CKT 439, PNK) input (Oldsmobile) is used to wake up the module. When you turn the ignition switch to the RUN position, the module continuously measures the ignition key resistor. When the ignition switch is in OFF, LOCK, or ACCY, the module does not measure the ignition key resistor.
^ Ground (CKT 851, BLK/WHT)
^ The key resistor (CKT 1073, WHT/BLK) and the key resistor ground (CKT 1074, PPL/WHT) inputs are used in order to determine it you are using the correct key in order to start the vehicle.

The following circuits are the theft deterrent module outputs:
^ The theft deterrent relay (CKT 625, YEL/BLK) output controls the theft deterrent relay.
^ The fuel enable (CKT 229, DK BLU) output commands the PCM in order to enable the fuel delivery. When the theft deterrent module sees the proper ignition key resistance, the module sends a pulse width modulated (PWM) signal to the PCM. If the theft deterrent module does not see the proper ignition key resistance, the module does not send a PWM signal to the PCM.
^ The SECURITY indicator (CKT 264, DK GRN) output controls the indicator that is located within the instrument cluster.