battery dead on smart key - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 11-16-2006, 04:53 PM Thread Starter
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battery dead on smart key

Hi,

Since this is my first time here, i'm not sure if this question was ever asked.

My batteries died on my smart key for my 1999 CLK 320, so I replaced the batteries but the key still doesn't work. Does anyone know why this is? Any information will be greatly appreciated.
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post #2 of 8 (permalink) Old 11-16-2006, 05:00 PM
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Welcome!

Look for the key synchronization instructions either in your manual or in the W208 CLK-Class forum.

That should do the trick.

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post #3 of 8 (permalink) Old 11-16-2006, 05:05 PM
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If your smart key stopped working, and after replacing the batteries it still does not work, the batteries were probably not the problem in the first place, but did you replace them with the same upside-downside orientation as they had been? I'm not sure that this is necessary, but that just occurred to me.

Also, the key has a little red light that is supposed to flash as you depress the buttons(s) Did you notice the behavior of this light before/after the battery change?

Good luck and welcome to the forum!

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post #4 of 8 (permalink) Old 05-11-2008, 11:29 AM
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Hey, I own a '03 CLK 500 and my smart key is dead.. any1 know how I replace the battery?
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post #5 of 8 (permalink) Old 05-12-2008, 03:12 AM
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Quote:
Originally Posted by CLK 500 Drvier View Post
Hey, I own a '03 CLK 500 and my smart key is dead.. any1 know how I replace the battery?
Would always help if you explain "what does not work". If the car does not start, it isn't an issue with the battery.

The user manual would (usually) explain how to change the battery from the smart key.
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post #6 of 8 (permalink) Old 05-12-2008, 07:13 AM
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To change the battery, remove the emergency key, and locate the litttle gray bar in the cavity, push it aside and the circuit board pulls out of the housing siimilar to a drawer.
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post #7 of 8 (permalink) Old 05-17-2008, 08:59 AM
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The smartkeys have a lifespan... of 80,000 starts I think... after that the key needs to be replaced

Does the key start the car? If yes but does not unlock the car thats the internal battery.
If not... the key is dead... time to replace it

The key, no matter if the battery is dead or not, will be powered from the ring around the ignition slot via inductive energy so you can still start the car if the batteries in the key are dead.

You would have to open the car with the metal key, thus setting off the alarm, but when you place the key in the slot the alarm stops... that is if the car and key can agree on the code set. This cannot be done if the life of the key is up.

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post #8 of 8 (permalink) Old 05-17-2008, 12:28 PM
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I have not heard the 80K number , but the key is powered by inductive energy and replies via the IR, thru a redundant DAS path so it does not lock as a result of a power failure
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