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Old 10-04-2008, 07:59 PM
Registered User
Join Date: Oct 2008
Posts: 2
Smart key problem

2004 CLK 320. I have two Smart Keys.
One key just stopped working - it won't turn in the ignition although it unlocks the car. I changed batteries with no improvement.
The other key still works fine, and will start the car even without the batteries.
Any help will be appreciated.

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Old 10-04-2008, 08:28 PM
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
The key requires no batteries for starting the car, only for the remote unlocking functions, so this is normal.
For the one that won't turn in the ignition, key is either "bad" ie defective/broken, or is incorrect for the car. Both of these keys are original to the car? If you put the non-turning key in the ignition do you see a message in the info display in the cluster OR is there a small LED on the key that is lit when the key is in the ignition??
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Old 10-04-2008, 08:56 PM
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Join Date: Sep 2008
Location: NY&FL
Posts: 159
You didn't get any type of moisture into it did you? If so you might need to replace it. I did this back in July when my wife and I were at a 4TH July party and she got the key wet. I had a new one with in 5days. about $200.
2015 ML350 4Matic. Wifes DD
2015 GLK350 4Matic. My winter DD
2012 E350 4Matic. Road Trip car
2009 CLK350 Coupe Designo.Kleemann Tune For nice days/DD
2006 CL600. V12.Eurocharged Tune. Enough said
2005 CLK55 AMG Coupe.Kleemann Tune. For the sound and style
2004 CLK320 Cabriolet. 2005+ Interior swap. For the sunny Florida days & beach days
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Old 10-04-2008, 10:31 PM
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Join Date: Oct 2008
Posts: 2
reply to Gilly

The key is original and worked fine up to today. There is no message in the cluster, nor a lit LED on the key when I put it in the ignition.
I guess the key just went bad. Good thing I have the spare.
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Old 10-05-2008, 06:31 AM
Join Date: Jan 2003
Location: Florida
Posts: 1,084
I would get one soon, order an additional not a replacement the replacement wipes the other. MB screwed up and wiped my good one. Besides the new ones are better looking

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