What is wrong with my car

[Goldenightime]

So my 2006 Lexus IS250's car alarm started faintly going off and beeping every 3 seconds or so. I can't use my key fob to lock or unlock the car I have to do it manually and even then it won't really work. I had to turn the key and open the door at the same time rather than the door being unlocked after I turn the key. Once inside, I can't start the car. It recognizes that I have the key near since it gives me the green light when I press the brake down to start the car, but the car doesn't turn over or anything. No reaction when I press the button to start the car. However, the check engine light is on. I can't turn off the car either (if it's even on, I think it is since I see the check engine light). What is wrong with the car?

Edited February 21 by Goldenightime
Misspelling

[Dean2]

Your security system has either activated or gone defective. Disconnect the negative terminal of the battery for a few hours, measure the voltage in the battery. It should read min 12.4 normal fully charged battery is 12.7. If it is below 12.5 put a charger on it and make sure it is fully charged. A defective or flat battery can cause this issue with the security system too. Then hook it back up. If that doesn'tclear the fault, get a code reader and see what codes are stored. Once you have that you can work from there.

[RX400h]

Quote

The issues you’re experiencing with your 2006 Lexus IS250 could be due to a few different factors. Here are some possibilities:

1. Electrical System Issue: The car alarm going off and the car not starting could be due to an electrical system issue. There might be a short in the system, something may not be grounded correctly, or a power wire could be causing this issue¹.

2. Faulty Anti-Theft System: The car’s anti-theft system might be preventing the car from starting. You can try resetting the Anti-Deterrent by using your key. Stand outside of the car and close all doors. Insert the key into the driver side door and turn the key to clockwise and counterclockwise for three to four cycles².

3. Battery Issue: If the battery is not fully charged, it might not have enough power to start the car. You could try jump-starting the car and then driving it for at least 30 minutes to fully charge the battery³. Also check your key pendant's battery if it has one.

4. Faulty EFI or Blown EFI Fuse: If the car still cranks strong but the security light is on, it could be a bad EFI or a blown EFI fuse.