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Q: Anti-theft alarm continue to activate when I lock my vehicle using my smart-key. on 2004 Mercedes-Benz SL500

I can't lock my vehicle because the anti-theft alarm activates all by itself. I've read the owner's manual to try and correct the problem..nothing works. Using the smart-key, I'll lock the vehicle, less than a minute later the alarm will sound until I unlock the vehicle. I must lock the "passenger side only" manually from inside the vehicle, leaving the driver-side unlocked to prevent the alarm from sounding
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