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George H.
George H., Hyundai Technician
Category: Hyundai
Satisfied Customers: 2059
Experience:  Hyundai Gold certified, ASE Master tech 15+ years
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I have a 2003 Hyundai sonata. I've been trying to start for

Customer Question

I have a 2003 Hyundai sonata. I've been trying to start for days. Replaced the battery in my key remote and since then I have not been able to start
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: No they aren't
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: The alarm is what I think is locking me out. When I go to start it the alarm goes off and all dash lights come on
JA: Anything else you think the mechanic should know?
Customer: My hazards start flashing and it doesn't allow me to start vehicle This sucks
Submitted: 8 months ago.
Category: Hyundai
Expert:  david craig replied 8 months ago.

Hi Im David, thanks for visiting the site. try this:

Remove center fascia (the plate surrounding the radio) and locate the alarm system control module. Ensure that the memory switch is in the OFF position.

2. Insert key into the ignition and turn ignition to the ON position.

3. After 5 seconds slide the switch on the alarm system control module to the SET position.

4. Press the LOCK button on the first remote to be programmed.

5. If programming a second remote press the LOCK button on the second remote.

6. Slide the switch on the alarm system control module to the OFF position.

7. Turn the ignition OFF and remove key. Replace center fascia.

8. Programming is now complete, test remotes to ensure proper programming

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