marameyer1
Seat Mii Key Battery Issue
Summary of the thread
A 2021 Seat Mii owner experienced a 'key battery low' warning, leading to non-functional keyless access and erratic locking/unlocking. The issue was suspected to be due to a dead key battery. A similar case suggested trying a spare key to confirm the problem. The solution was a key battery replacement at a workshop, which resolved the issue, restoring key functionality and clearing the error message.
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4 comment(s)
marameyer1 (community.author)
That's interesting You mentioned a warning light. Do you recall if it was a specific key battery warning, or just a general error? And did the spare key work without issues in your case?
LukasOswaldFan
Yes, it was a specific key battery warning, if my memory serves me correctly. The spare key worked perfectly; that's how I knew it was the key battery and not something more serious with the car's system. To be absolutely certain, I would suggest visiting a workshop for a battery replacement.
marameyer1 (community.author)
You were right It was the key battery. A quick replacement at the workshop, and everything is working again. The auto key is responding instantly, and the error message is gone. The total cost was 37€ Thanks again for your help
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SEAT
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MII
LukasOswaldFan
I think I had something similar with my Mii. The keyless entry stopped working, and I remember seeing a warning light. I am not sure, but could it be the key battery perhaps? Have you tried the spare key to see if the same thing happens? I'm just wondering if it is a low voltage issue.