E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

Help with Central Locking

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Old Jul 21, 2006 | 01:02 AM
  #1  
malinov's Avatar
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Question Help with Central Locking

For some reason when I use the key remote to unlock the car the indicator lights on the mirror and door blink red and green but the car is neighter locking or unlocking.

I have to enter the car manually throught the passenger door. If I put the key inside the ignition and turn it to position 2 and press on the key remote button it locks and unlocks fine, also main central locking button works when the key is inside position 2 on the ignition.

From what I am seeing, the key does transmit signal, the central locking system does work under certain condition which leads me to believe that somehow I need to program something.

Does anyone have any suggestions?

Car is: E420, Year 1997

Last edited by malinov; Jul 21, 2006 at 01:03 AM. Reason: Forgot Model of car
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Old Jul 21, 2006 | 06:27 PM
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From: Switzerland
'96 S320 , '98 E280 4matic '06 S350L '09 GL450
It could be also be a weak battery in the remote. You might have to resync the key with the car.
I know that these are the same symptoms that I had on my '96 s320 and I had to change the battery.
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Old Jul 21, 2006 | 06:40 PM
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Originally Posted by FlavioB
It could be also be a weak battery in the remote. You might have to resync the key with the car.
I know that these are the same symptoms that I had on my '96 s320 and I had to change the battery.
The indicators on the door and the mirror flash when I press on the button so it seems that it does transmit signal, but maybe the signal is not strong enough? How to you sync key with the car?
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Old Jul 22, 2006 | 11:48 PM
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Unfortunately changing the battery on the remote didn't fix the problem, I guess I have to goto the dealer
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Old Jul 23, 2006 | 09:36 AM
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From: West Virginia
2001 E320 RWD - Brilliant Silver/Ash: 100,000+
Arrow malinov

Originally Posted by malinov
Unfortunately changing the battery on the remote didn't fix the problem, I guess I have to goto the dealer
I'm probably a bad one to comment on anything DIY, because I use the dealer for just about everything. However, I have discovered that the dealership is the WRONG place to buy those "cheapie" watch batteries. I found a pair at WalMart for $5.95 (icluding tax) and I think my dealer charged me 3-4 times that. Anyway, live and learn...

The Smart Key is supposed to have a battery indicator light. If it flashes red when you push any of the buttons, the batteries are good. I don't know if the color changes, or if there is no flash, if they are bad.

Since you have already tried the bad battery solution, that re-sync idea is probably the way to go. I have also been told that these keys are all "VIN specific" - for what that's worth.

Good luck,
M

Last edited by Musikmann; Jul 23, 2006 at 09:37 AM. Reason: addition
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Old Jul 23, 2006 | 05:40 PM
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From: Switzerland
'96 S320 , '98 E280 4matic '06 S350L '09 GL450
I don't have my manual with me at the moment but I know that if you've changed the battery you need to do a resync. I can post more info tomorrow but you'd be better off checking your manual for the way to do it.
Good luck
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