Question about Hyundai Motor 2002 Elantra

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Alarm system not working

Car was working fine yesterday. Neighbor notified us this morning that the alarm was going off. Tried the keychain (touching "unlock" is supposed to do the trick). Didn't work. Removing the battery was the only way to shut the alarm off. Purchased and installed new battery. Now the car sputters and chokes and stinks like something is burning. Alarm also goes off again.

What is going on???

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A friend of ours did some research and discovered it was the ECU (fuse?) that needed to be reset. We removed the ECU (which controls the cruise control, and "learns" the driving patterns of the driver and adjusts the fuel economy) and the car is running fine. To reset the ECU you need to remove the negative cable from the battery, turn the car to "A/C On" (don't crank the engine) for 10 seconds, then shut it off. Replace the negative battery cable. This should reset the ECU. The car does run much better with the new battery. The previous battery was the original and was approximately 6 1/2 years old so it needed to replaced anyway.

Posted on Nov 10, 2008

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