How to programme a 2005 Mercedes CLK key

How to programme a 2005 Mercedes CLK key

Here, Autowave HQ runs through the process of programming a 2005 Mercedes CLK, where the customer required a spare key.

The process was carried out in the following stages using the XTool Pad Elite Key Programming device and KC501, which allows for programming without any dismantling of the vehicle. The spare key used in the images was supplied by Autowave.

Vehicle – Mercedes CLK 350 2005/55
Situation – Customer required a spare remote key for the vehicle. Existing key was fully working. It is worth noting that the customer had an older style black key, Autowave upgraded to a newer style chrome key which was fully compatible.
Equipment and parts needed and why – X-Tool X100 Pad Elite and X-Tool KC501 were used, these were chosen as they are reliable, have fast calculation time and do not require any form of tokens. The spare remote used was from Autowave part number AUTRK0039.
Factors – It is advised to scan the vehicle for fault codes before and after the job, ensure battery level is kept consistent and have a solid internet connection throughout the process.

Step-by-step guide

How to programme a 2005 Mercedes CLK key
Fig 1


Step one: Connect the OBD connector into the socket located below the steering wheel as shown in the image (fig 1).

How to programme a 2005 Mercedes CLK key
Fig 2

Step two: The first screen that we will display is the home screen, press diagnosis (fig 2).

How to programme a 2005 Mercedes CLK key
Fig 3

Step three: A list of available manufacturers will appear, from here select ‘BENZ’ (fig 3).

How to programme a 2005 Mercedes CLK key
Fig 4

Step four: On the next screen will be four options, the one that needs to be selected it infrared key system (fig 4).

How to programme a 2005 Mercedes CLK key
Fig 5

Step five: Next choose the ‘Add Key’ option from the image shown (fig 5), this will detail the guided procedure, the other options like EIS functions are useful for checking the operation of the ignition switch circuit.

Fig 6

Step six: Fig 6 shows an overview of the steps which will be carried out to complete the adding of the key. Note: a good internet connection is required via Wi-Fi or tethering off a mobile device.

Fig 7
Fig 8

Step 7: Connect the KC501 device to the Pad Elite inserting the USB cable supplied with the device into the top of the device (fig 7) and inserting our original key into the EIS but not turning the ignition waiting 5 seconds then removing (fig 8).

Fig 9

Step 8: Now choose the method of communication with the EIS (fig 9).

Fig 10

Step 9: Click on ‘read via obd’ (fig 10).


Fig 11
Fig 12

Step 10: Next choose from the list of available models (fig 11) or the automatic identify function. On this occasion the model code is unknown so auto identify will need to be selected. As shown in fig 12 the vehicle has been auto identified as a W209.

Fig 13

Step 11: Reinsert the original key back into the EIS without tuning the ignition on wait 5 seconds then remove the key and press ok (fig 13).

Fig 14

Step 12: Insert the original key into the KC501 in its infrared key slot (fig 14) and press ok

Fig 15

Step 13: Press OK to confirm KC501 is connected to the device (fig 15).

Fig 16

Step 14: On the next screen the device will calculate the password for the key file, which will be written to the new key. This process can take approx. 5-10 minutes. (fig 16).

Fig 17

Step 15: Fig 17 shows that the password calculation is now complete.

Fig 18

Step 16: Remove the original key from our KC501, insert it into the ignition without turning and carry out the onscreen instructions (fig 18).

Fig 19

Step 17: Fig 19 shows the calculated password and key location screen. Select the key location by pressing the tab indicated by the arrow and picking a slot.

Fig 20
Fig 21

Step 18: The data should now successfully be written to the new key (fig 20). Insert the new key into the ignition switch and allow a few seconds for it to initialise, then the key will start the vehicle and the remote will function correctly (fig 21).

To view the video version of this step-by-step guide, click here. For more information on Autowave, visit

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