Anti-theft malfunction?

BBBRUINS201117

MEMBER
2011 HYUNDAI SANTA FE
3.6L
V6
2WD
AUTOMATIC
143,000 MILES

I lost the main original car key to my car but had the spare key that came with it and the 2 spare fobs from the manufacturer that came with the car. So, I used the spare key to attempt to get into my vehicle and was successful however the car alarm did not disable despite my unlocking the car with the spare key. I was unable to start the car, so I disconnected the battery terminals, removed the alarm fuses, waited a few minutes then replaced them. After 30 minutes I reconnected the battery to the same result the alarm was going off repeatedly. I left the key in the ignition “on” position until the flickering and horn stopped. I can’t figure out how to disable the anti-theft to allow me to start my car, can you help?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,536 POSTS

Here is the information to reset and how the alarm works:

Description

Burglar Alarm System
The burglar alarm system is armed automatically after the doors, hood, and tailgate are closed and locked.

The system is set off when any of the following occurs:
- A door is forced open.
- The tailgate is opened without using the key.
- The hood is opened.

When the system is set off, the alarm sounds and the hazard lamp flash with the cycle of the ON for 30 sec. And OFF for 10 sec. 3 time or until the system is disarmed by pressing the unlock button on the transmitter.

For the system to arm, the ignition switch must be off, and the key removed. Then, the body control module must receive signals that the doors, hood, and tailgate are closed and locked. When everything is closed and locked, none of the control unit inputs are grounded.

The door switches, hood switch and tailgate switch are all close and lock the doors with the remote transmitter and then the system arms immediately.

If anything is opened after the system is armed, the body control module gets a ground signal from that switch, and the system is set off.

If one of the switches is misadjusted or there is a short in the system, the system will not arm. As long as the body control module continues to get a ground signal, it thinks the vehicle is not closed and locked and will not arm.

Keyless Entry System
The burglar alarm system is integrated with the keyless entry system. The keyless entry system allows you to lock and unlock the vehicle with the remote transmitter. When you push the UNLOCK button, all doors lock. When you push the Unlock button once, the driver's door unlock. And you push the unlock button again within 3 sec, all doors unlock. (Two turn unlock function)

The room lamp, if its switch is in the center position, will come on when you press the UNLOCK button. If you do not open a door, the light will go off in about 30 seconds, the doors will automatically relock, and the burglar alarm system will rearm. If you relock the doors with the remote transmitter within 30 seconds, the light will go off immediately.

You cannot lock or unlock the doors with the remote transmitter if the key is in the ignition switch.

The system will signal you when the doors lock and unlock by flashing the hazard lamp once when they lock, and twice when they unlock.

Check out the images to reset the system (below). Please let us know what happens.

Images (Click to make bigger)