I had a windshield replaced on a 2005 Hyundai Elantra, and coincidentally the key fob no longer works. I can open the door using the physical key, but the alarm goes off and I am unable to use the key to turn the ignition on.

Any ideas on what went wrong? How can I fix this issue? Thank you!

1 Answer 1


It seems likely to me that before replacing the windshield, the shop disconnected the battery as a safety precaution. As such, the car lost its FOB programming.

According to the information here:

Key FOB Instructions

Dealer programmed Hyundai keyless entry FOBs must be reprogrammed after each vehicle or FOB battery replacement.

The procedure is:

Step 1 Sit in the driver's seat of your Hyundai vehicle. Close all of the vehicle's doors behind you.

Step 2 Stick the key to your Hyundai into the vehicle's ignition cylinder. Turn the key to the "ACC" or "Accessory" ignition position.

Hold down the "Open" or "Unlock" button on the keyless entry FOB until the vehicle's lights flash. The keyless entry FOB is now reprogrammed to your Hyundai vehicle.

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