How do you activate the security on my Toyota 4Runner 2004 model?

To activate the security system on your 2004 Toyota 4Runner, ensure all doors are closed and locked. Use the key fob to lock the doors; this will automatically engage the security system. You should see the indicator light on the dashboard flash, confirming that the system is armed. If you need to manually activate it, you can also use the physical key to lock the driver's door, which will set the alarm.