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by Bignick777
Sat Nov 15, 2025 4:38 pm
Forum: RS4 (B7 Typ 8E) 2006–2008
Topic: Car alarm - auxiliary battery?
Replies: 3
Views: 2576

Re: Car alarm - auxiliary battery?

The auxiliary battery is contained within the siren module (two little NiMH cells); these tend to go bad and leak with age, ruining the whole siren module. Another common occurrence is moisture creeping in there and causing oxidation on the circuit board, leading to erratic behavior from the module ...

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