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Car wont start after battery replacement. Horn blowing constantly. Also indicators and wipers are on constantly.

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    Welcome to Motor Vehicle Maintenance & Repair! Commented Jun 9, 2019 at 15:36
  • If you have an electronic key, try pressing the different buttons on it. Sometimes when the ECM gets one of those signals (alarm, lock or unlock), it will notice that an authorized person is nearby, and come back to its senses.
    – Cullub
    Commented Jun 10, 2019 at 16:05

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When you replace a battery, some cars’ computers reset. There is likely some secret code you have to enter into the dash while the key is in Acc. Google Hyundai coupe ECM reset.

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