Moving the ignition switch to the CRANK position sends a 12 V signal to the PCM Ignition Crank (Sense) input. The PCM verifies that it has received a (valid theft password) from the vehicle's body control module and that the transaxle is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the Crank Relay. When the Crank Relay is energized it completes the B+ voltage circuit to the starter solenoid S terminal.