When the GEM receives a valid lock command from a control lock switch, key cylinder switch or the remote keyless entry transmitter it grounds the internal all lock relay supplying lock voltage to the actuators. The GEM starts an internal timer as soon as the lock command is received. If a second lock command is received from a key cylinder switch or remote keyless entry transmitter within three seconds of the original lock command, the GEM will ground a second internal relay, supplying voltage to the lock actuators again. The two voltages are supplied to the actuators through separate pins of the GEM C201 and separate pins on the actuators. The ground remains constant through the GEM internal unlock relay. If the vehicle is equipped with a perimeter alarm system, the alarm will arm after the prearming timer expires. The doors and liftgate must be closed for the double lock to function. If the door ajar circuit is at open, double lock will be disabled. The double lock voltage will not be actuated if the ignition switch is in RUN, the key is in the ignition or an unlock command is received within the timing period.