Hyundai Sonata - Recent Questions, Troubleshooting & Support - Page 9
Hyundai sonata 2002 remote
There is a special (proprietary) programming electronics 'black box' for the keyless entry system on all Hyundai vehicles for programming the remotes. This programming is stored in either the BCM (body control module) or the ETACS module (Electronic Time and Control System).
2003 Hyundai Sonata Door Lock Problem
I had this problem. Through some research and asking some service personnel I found out it is a fairly easy fix. You will need to buy a new relay switch for the door locks. The dealer will/should know what you need. They are located (two of them, buy two and replace both) on the back side of the fuse box. It is not that easy to get back there. I had to lay on my back with my head up under the instrument panel. They are visible and can be removed if you take some time and be careful. Once I knew what I was looking at, it was easy to replace and the remote works like a charm. You can go to an auto supply, like Autozone, and they should have a schematic to show you where these relays are.
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