the way suggestested to me wouldnt work with flat battery as it more to do with central locking.
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how ever if you wish to know how to solve the problem of fla battery no key il pm you.
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if you would rather the non flat battery approach, that was recommended to me.
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since this my alram played up a couple of times and ive had to call the AA out and they have enlightened me of a couple of ways