Alarm lights flash after installing battery and driving

2000 MITSUBISHI ECLIPSE
189,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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UCDNAS071
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Can't get the alarm to shut off after installing battery and driving. Been told it is an ECM issue. Do not have the OEM key fob for the alarm and only one key. Drives okay just the lights flash every 5 minutes for about 10 minutes. Any ideas?
Mar 5, 2022 at 2:15 PM
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KASEKENNY
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Couple questions on this. Are you the original owner? Do you know if the theft system is bypassed?

If sounds like the ECM is ignoring the theft light except now that the battery was disconnected and then reconnected, it forced a reboot of the immobilizer.

Basically, I suspect we have an issue with the key that you are using due to it not being an OEM and now that the battery has been replaced, the bypass program was erased.

Here is a guide that will help with disabling it, but I doubt this is going to work in your specific issue:

https://www.2carpros.com/articles/how-to-reset-a-security-system

If this doesn't then we need to check for codes and find out what the issue is. The common codes are below but let's start with this and find out what is there. Thanks
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Mar 6, 2022 at 1:35 PM