I have an Alpine CDA-9830 in an '89 300 SE I just bought. All functions work as they should and it sounds great. The only problem is that the remote control doesn't work. I used a digital camera to verify that the remote is transmitting (at least I can see a light when I press any of the buttons), but can anyone tell me if that's enough to confirm that the remote is good? If so what is likely to be the problem. Thanks.

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire