Keyless Entry - Remote Transmitter Service Tip
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Inspections of returned Keyless Entry Remotes for inoperative complaints found that many are due to oxidation on the contacts. Merely moving the battery itself disturbs this oxidation and the remotes then operate normally. This would be a very inexpensive first thing to check for an inoperative complaint. Check the battery and terminal condition and buff with a coarse cloth if either the battery or terminals are oxidized.