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Old 11-20-2012, 09:31 AM   #1 (permalink)
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Date registered: Oct 2012
Vehicle: 2007 CLK350
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Post clk350 inner key

Gmorning all. I recently purchased a 2007 clk350

Just wondering what this inner key is for (see attached photo). The seller told me it was to lock the glove box, but i dont see a keyhole on the glovebox for it.

please advise. Thanks
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Old 11-20-2012, 10:24 AM   #2 (permalink)
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It's an emergency key to unlock the driver's door if the battery in the fob is low and the central locking fails. It fits inside the remote key.

You can start/drive the car without a good battery in the fob.
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Old 11-20-2012, 10:40 AM   #3 (permalink)
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that makes sense! so its not for the glove box, or the trunk?

also, how would it be used to start the car?

Quote:
Originally Posted by keyhole View Post
It's an emergency key to unlock the driver's door if the battery in the fob is low and the central locking fails. It fits inside the remote key.

You can start/drive the car without a good battery in the fob.
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Old 11-20-2012, 12:42 PM   #4 (permalink)
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The glove compartment in the W209 has no lock (except for the cabriolet, and then the lock is electric and tied into the door locks). Earlier models of the W209 CLK did have a lock on the center armrest cover that used the key, and other MBZ models do have locking glove compartments using the key.

As Keyhole said, that key is only to be used in a situation where the vehicle battery or the SmartKey fob battery is dead so the Remote Control Locking (RCL) function doesn't work. You should have a key slot in the driver's door handle as well as on the trunk (next to the handle, above the tag). By the way, to open the trunk with the hard key, you insert the key and turn it, then pull the handle.

The battery in the SmartKey fob is only used for RCL. To start the engine, the ignition switch has and inductive coil that powers the circuitry in the SmartKey so it can validate it.
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Old 11-21-2012, 04:11 AM   #5 (permalink)
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This page from the WIS explains how to use the remote key on your W209. Note the 'Global' and 'Selective' modes available.
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File Type: pdf W209 key.pdf (900.2 KB, 74 views)
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Old 11-21-2012, 08:27 AM   #6 (permalink)
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One other item on the trunk...to open it with the hard key, inset it into the lock and rotate it 90-degrees counter-clockwise, then pull the handle. For cars before MY2005 (and some late MY2004s), you can also rotate the key 90-degrees clockwise, then remove it and this will "valet lock" the trunk -it cannot be opened with the SmartKey RCL function or with the release button in the cabin.

EDIT: I checked this on my 2007 CLK and it has the valet lock function. According to dealer documentation, it was deleted with MY2005, but maybe it was added back later. Or, maybe it's still there on the cabriolet. Anyhow, that's another feature of the hardkey if the vehicle is equipped that way.

Last edited by rudeney; 11-21-2012 at 02:21 PM.
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Old 11-26-2012, 11:27 PM   #7 (permalink)
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key is just to be utilized within a scenario where the vehicle electric storage device or the smartkey fob electric cell is dead so the remote control locking method doesn't work. You may as well have a nexus opening in the driver's entryway handle and in addition on the trunk.
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Old 11-27-2012, 07:05 AM   #8 (permalink)
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One time I opened the door with the inside key and the alarm went off. Is this normal? Why would it do this?


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Old 11-27-2012, 07:21 AM   #9 (permalink)
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Yes, opening the door with the hard key will trigger the alarm. Basically, when you set the alarm via the fob's RCL function, it will be triggered when any door, trunk or hood is opened unless you unlock via the fob (thus disabling the alarm). The same thing will happen if you sit in the car, lock the doors via RCL then open a door to exit.
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Old 11-27-2012, 07:29 AM   #10 (permalink)
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Quote:
Originally Posted by rudeney View Post
Yes, opening the door with the hard key will trigger the alarm. Basically, when you set the alarm via the fob's RCL function, it will be triggered when any door, trunk or hood is opened unless you unlock via the fob (thus disabling the alarm). The same thing will happen if you sit in the car, lock the doors via RCL then open a door to exit.
Oh makes sense I guess. Our 2010 commander had a similar looking key fob. It would do the same thing. And the key fobs kept failing. We would get looks from people thinking we were breaking into it lol. Went thru 2 sets of keys and they still don't work intermittently. We have never had a problem with the Mercedes key


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