haraldberger5
Seat Mii alarm siren communication fault
Summary of the thread
A 2016 Seat Mii displayed a 'Siren communication fault' error, rendering the alarm system non-functional. The issue was suspected to be due to a defective cable or plug connection, possibly involving the alarm controller. After investigation, it was confirmed to be a wiring issue caused by corrosion on the siren plug contacts, which was resolved by cleaning the contacts.
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4 comment(s)
haraldberger5 (community.author)
The battery seems fine, no issues starting the car or with other electrical components. But the alarm system doesn't work at all. When you had this issue, did the error memory also report a communication fault with the siren? Was it the alarm disarm function that failed?
stefan_schulze1
Yes, same error message! And it was the alarm disarm too. I tried checking the fuses, but no luck. Honestly, I'd take it to a workshop. Probably a wiring issue as you suspect.
haraldberger5 (community.author)
It was indeed a wiring issue. The plug to the siren was corroded. Cleaned the contacts and now it is all good. Total cost 95€ including diagnostics. Thanks for the input, it helped narrow it down.
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SEAT
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MII
stefan_schulze1
Sounds like the alarm siren is acting up. Is the car battery in good shape? I had a similar issue with my Mii, the alarm would randomly go off. Could it be a voltage problem?