Lock (Transmitter)

When a lock command is received from the transmitter, the BCM provides battery voltage through circuit 195 to the door lock relay in the IPFB. The door lock relay coil, grounded by circuit 650, energizes and causes the relay contacts to close. When the relay contacts close, battery voltage is provided through the POWER DOOR LOCKS 20 A fuse, through the relay, and out of the IPFB to each of the door lock motors. The driver door lock motor is grounded through the driver door unlock relay in the IPFB circuit 650. The other door lock motors are grounded through the door unlock relay in the IPFB circuit 650.

The Saturn Security System is automatically enabled when the LOCK button is pressed on the transmitter. The LOCK button can be pressed a second time for a horn chirp confirmation. If the LOCK button is pressed twice, and any of the doors are open, the horn will not chirp.

When the Saturn Security System is activated, the BCM will chime at 200 chimes per minute for 10 seconds, Pre-alarm. Following this 10 second pre-alarm warning, the horn will cycle at 1 Hz with 200 ms on time, and the daytime running lamps (DRL) will flash, full alarm. The DRL lamp will not flash during the 10 second pre-alarm. Full-alarm will continue until any button is pressed on the transmitter, or 2 minutes have passed, whichever occurs first.