I own a hyundai sonata 2005 with a factory installed alarm system...i recently lost my fob and now cannot start the car without it. the alarm doesnt sound off, i just cant start the car whatsoever. i tried turning the key to the on position for 30-90 seconds, then to the left for 10 seconds like a mechanic told me, still doesnt work....i even tried to remove the fuse still wont start!! what do i do??

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4. How to Program Keyless Entry Remotes in a Hyundai Sonata

How to Program Keyless Entry Remotes in a Hyundai Sonata By Christian Killian, eHow Contributor

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20Found This Helpful The keyless entry system in your Hyundai Sonata is part of the factory alarm system. If you have to replace a lost or damaged remote, reprogramming will be necessary. The remote is important because not only does it lock and unlock the doors, it also arms and disarms that factory alarm when you open or close your car doors. New remotes are available from any Hyundai dealer. While they will program it for you, you can do it yourself and save a programming fee.
How to Program Keyless Entry Remotes in a Hyundai Sonata(Kleophaus Livingston/Demand Media)

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Step 1: Locate the fuse panel under the dash on the driver's side of the car. Just below it is the control module for the factory alarm system. Open the cover on the alarm system control module and locate the memory switch inside.
(Kleophaus Livingston/Demand Media) Step 2: Verify that the switch is in the "Off" position; if it is not, switch it to the "Off" position. This is important for the system to understand what you want it to do when you move to the programming mode.
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Step 3: Insert the key into the ignition of your Sonata and turn the key to the "On" position. Wait for 60 seconds, then move the memory switch inside the control module to "Set."
(Kleophaus Livingston/Demand Media) Step 4: Depress and hold the "Lock" button on your remote for one full minute. This allows the remote and the control module to communicate and sync. Release the "Lock" button and turn the memory switch in the control module back to the "Off" position.
(Kleophaus Livingston/Demand Media) Step 5: Turn the ignition switch to the "Off" position and test the remote by pressing the "Lock" or "Unlock" button, verifying that the doors do lock or unlock.


Read more : http://www.ehow.com/how_6362326_program-entry-remotes-hyundai-sonata.html

Incorrect. As long as it IS/WAS original factory alarm & key fob previously programmed to you Hyundai, it is the easiest to program yourself.
There are multiple different sites listing many ways to program, but the majority suggest you close all doors, insert key into ignition, turn only to the ACC on ignition switch but do not start, then hold down the unlock/open button on fob until the alarm hazard lights blink & you are done.

Your Sonata is equipped with a "Keyless Entry & Burglar Alarm" system. When the Burglar Alarm is activated, it KILLS the starting system through the used of a relay called the "Burglar Alarm Relay". This mode prevents engine starting with the key.
Solution #1
Disarm the system with the Keyless Remote (key fob) If you don't have this remote (or its battery is dead) replace the battery & try disarming again.
Solution #2
Enter the vehicle & insert the key in the ignition and turn the ignition switch to 'RUN'. Wait 3 to 5 minutes until the alarm stops. You should then be able to start the engine.

Have a qualified/certified Hyundai Service Technician properly diagnose this issue.

The 2003 Sonata is equipped with a 'starter KILL' burglar alarm system with disables the starting system (using a N/C 'contacts' configuration instead of a N/O contacts configuration). N/C=Normally closed, and N/O=Normally open contacts. When the alarm goes off with a MY Sonata, the only way to DISARM it is with the key fob (remote) originally programmed for it (unless you purchase a new remote & have it programmed for the vehicle at an authorized Hyundai Service Department). NOTE: So long as the keyless entry & burglar alarm system is functioning/operating normally, the alarm will keep going off and the STARTER KILL function will still prevent you from starting the vehicle. One option is left without purchasing a new remote and having it programmed.
1. When the alarm goes off, get into the vehicle and insert the ignition key into the ignition.
2. Turn the key to the 'RUN' position (NOT the ACC position) and wait for the alarm to STOP (usually about 3 to 5 minutes).
3. The engine should then start using the ignition key.

If this procedure doesn't work, the problem will need further diagnosis by a qualified/certified Hyundai Service Technician.

Hope this helps

Well, you basically have only 3 choices:
1. Pay the fee at the dealership
2. Purchase the high-dollar equipment that is required to perform the programming procedure
3. Forget about adding another key fob to tor vehicle.

TECHNICAL SERVICE BULLETIN

Group
90 - ELECTRICAL

Number
03-90-020

Date
October, 2003

Model
Elantra 2001-2004, Santa Fe 2001-2004, Sonata 2002-2004, Tiburon 2003-2004, XG(NNN) NNN-NNNNand XG(NNN) NNN-NNNN2004

Subject
SECURITY SYSTEM KEYLESS ADAPTER CABLE

This bulletin supersedes TSB # XXXXX
DESCRIPTION:
The security system keyless adapter cable (SPX/Kent-Moore P/N 09900-21300) is a special service tool (SST) that is used for programming new keyless entry remote transmitters to the factory security systems. The keyless adapter is used in conjunction with the Hi-Scan Pro (with Hi-Scan SOL Pro Software Version 09-29-03 or newer) and Data Link Connector (DLC) Cable.
SERVICE INFORMATION:
The keyless adapter cable can be used on the following vehicles:
^ 2001 -2004 Elantra
^ 2001-2004 SantaFe
^ 2002 - 2004 Sonata

no valet switch,you will have to replace batteries/keypad to make it work and you CANNOT bypass the system......otherwise whats the point in fitting it??

Yes!... reset the alarm with the fob!

ashley the ecm doesnt control the inside of the car.there is a ETACS (electronic time and alarm control system that may be the problem. does your key fob work? the head lights are controlled by a auto light control unit.and there is a head light relay and a tail lamp relay.does the blower stay running on high ? what speed?do you have day time running lamps and do they operate?has the car been wrecked?also check the body grounds.

1) remote starter was not hooked up to the factory arm wire
2) trunk release was programmed to disarm factory alarm before popping trunk
3)parking light wire on remote starter was not hooked up
4)disarm wire from remote starter was not hooded up
5)this is not normal and they should fix the problem or have it done by some one else and have them pay for it, how much did they charge,
Bring it over I'll fix it right and not charge overpriced amount