Home > Technical > COMPUTING DATA PLEASE WAIT Ignition New Key Problem


computing data please wait key dashYou insert the key into the ignition, but your Mercedes-Benz won’t start or crank. You notice that in the instrument cluster, you get the message “Computing Data Please Wait” and the key symbol shown in the picture above. This happens because either you are using a new key or one of the Drive Authorization System (DAS) components is defective. If the key is new, then the solution may be simple. If parts like EIS, ECU, or EWM are bad, that’s another story.

You could use an OBD II scanner, such as the YOUCANIC Full System Scanner used by the dealers with a reasonable price tag, to read, erase the codes, and program the modules on your Mercedes-Benz.

In this particular S-Class, our scanner was showing the following error message:


This code points to an issue with the gear shifter module. Reading the codes from EWM, we noted the following code.

P1925 Drive authorization has been refused by control module N15/5 (Electronic selector lever module (ESM (EWM))
You may get this code if you recently replaced the shifter module with a used one. You can’t just install a used shifter but need a “virgin” unit to “marry” to the car using Star Diagnostic software.
If nothing changed on your car, but you are simply using a new key ordered from the dealer, follow these easy instructions first. Don’t replace any parts before you try this.
  1. Connect a car charger to the main battery. You need a charger to plug into the power outlet and generate at least 10 amperes. A 2 amp or battery tender will not be enough, and the battery drains too quickly. A good choice would be the Schumacher Speed Charger.
  2. Insert the key into the ignition and turn to position two. All dash lights should turn on. If the key doesn’t turn, you may need to use YOUCANIC Full System Scanner to unlock Drive Authorization System. If you remove the key from the ignition during this time, you have to start over.
  3. Leave the key in the ignition for at least 6 hours for the key to synchronize. We are not kidding. Once the key is synchronized, you should no longer see the “Computing Data Please Wait” message in the instrument cluster, but now you should know the mileage.

This tip worked on our S-Class W220. It took about five and a half hours for the key to pair up with the car. Mercedes-Benz keys come pre-programmed when you order them from the dealer, and you usually don’t have to follow this procedure. This wasn’t the case for us; we were getting the error codes listed above. We did not replace the shifter module or any other parts to resolve this issue. After several hours of leaving the key in the ignition, the key synchronized with the car.

If you have the YOUCANIC Full System Scanner,  there is an option to carry out this procedure and speed up the process. Honestly, we are not sure why it takes so long. Maybe Mercedes-Benz didn’t want someone to generate new keys from dumps and try to steal a Mercedes-Benz in just minutes. What thief would sit on a Mercedes-Benz for 5+ hours until the car recognizes the key?

What is the Best Scanner to Unlock my Mercedes-Benz Drive Authorization System?

If you’re experiencing problems with your Mercedes-Benz, the YOUCANIC full system diagnostic scanner can be an invaluable tool for troubleshooting and diagnosing the issue. This scanner is designed specifically for use with Mercedes-Benz vehicles, allowing you to access and analyze data from your car’s various systems and modules.

With the YOUCANIC scanner, you can perform various diagnostic functions, including reading and clearing fault codes, monitoring live data, performing component activation tests, and more. This allows you to identify the root cause of the problem and take appropriate action to fix it, whether it involves replacing a faulty component, adjusting to a system setting, or performing more extensive repairs.

By using the YOUCANIC full system diagnostic scanner, you can save time and money by avoiding unnecessary trips to the mechanic and performing repairs yourself. Plus, with the ability to access real-time data and diagnostics, you can stay on top of your vehicle’s maintenance and prevent potential problems before they occur.

Leave a Reply

Your email address will not be published.

All rights reserved Notice: CLOUD