1996 SL500 my remote does not work to lock/unlock my doors anymore, although I can see the alarm red/green leds flash on/off. My indie tells me the remote needs to be reprogrammed and has to go to the dealer.

Is it possible for me (or my indie) to reprogram the key? Thanks guys!

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special

Making sure the batteries are good is the 1st step.
Then getting into the car, shutting the door, pointing the remote at the mirror, pressing the button on the key twice, inserting the key into the ignition, turning the key to position 2 & then off, removing the key, pointing the key at the mirror again, & then pressing the button on the key.

That is the ONLY programming of the key..synchronizing is a better description.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
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Retired Moderator

Would this be the same procedure for a 1990 500 SL ?

Thanks guys, I'm starting to think it's not the syncing. When I press the remote button I can see the alarm leds going on and off, but no locking. I am assuming if my remote was not synced/programmed correctly the alarm would not toggle on/off either?

Could it be some kind of locking module connected to the remote function?

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special

A functioning key battery is needed to trigger the door locks. Did you replace it?

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Would a non functioning key battery allow the remote to turn on/off the alarm?

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special

The battery is needed to operate the locks, the ign and security communications are transmitted via transponders.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

So that would explain why I can start the engine and turn the alarm on/off but not unlock the car with the remote.

Where can I get a new battery?

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special

Drug store, etc. Its a watch battery.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Excellent, thank you VERY much. I'll give it a shot tommorrow. I did call the dealer and told them what was going on and the tech told me the if the remote turns the alarm on/off but doesnt lock the car that its not an issue with the remote, but with the central locking system. I hope he's wrong!

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2007 Corvette Convertible Torch Red
1996 MBz SL500
2008 Harley Davidson Night Rod Special

Hi the dealer who told you about the problem, it that right if the infrared reciever(Led inside the car Green&Red Flash Blinking) The problem it Should be From your Central Lock Vaccum Pump It burn or Spoil Fuse power supply or Vaccum Air Distribution system leak Air, According my experience It should be from your central Lock in side Rear Trunk I advise you to repair or chang it

hi is does all this programming information apply to 1999 ml320 models ? if not please provide instructions thanks.