Through the years, several members have posted their wish that the default of 3-blinks on 1-touch lane changes could be changed to 5 blinks. This is now easily doable.

There are several OBDII readers that allow you to program changes to default settings. This thread is a step-by-step procedure to change the 1-touch turn signal from 3 blinks to 5 blinks using the Launch Creader Elite 2.0 Benz, available at Amazon and other sources…



First topic of business is to update all the software, including the MB/Maybach software to REQUIRED version v50.26. This reader has onboard WIFI, so the update is easy while sitting on the couch.

Once updated, connect the provided OBDII cord to the OBDII slot under the dash in your car to the left of the steering wheel. If auto search VIN is enabled (recommended), the Launch Creader will ID your VIN and then run a full diagnostic of your W212’s system. I recommend clearing all DTC codes identified (prompted) before proceeding.




The diagnostics results page (above) will list all the systems available (scroll down to see them). Look for the “Driver-side SAM – Front Signal…” Touch the RIGHT arrow on this line to reveal the next page… Caution: The Front SAM contains dozens of programmable features. Be very careful in navigating the options to prevent unintended changes.




Scroll down and touch “Parameter_Turn Signal” then…





Scroll down to “One-touch Turn Signaling_count” In my car. It’s line 013, but may be numbered differently for yours. Notice the default value of “3” on this line. Touch this line to reveal a drop-down screen to select optional values.



Find and select the desired count “5” then after the value updates to “5”,




on this screen, verify that "5" is selected, touch on “Write Coding” in the lower left.

Test that your one-touch results in 5 blinks. You're done!

 

Thanks. You may want to recommend creating a backup by selecting Backup before writing changes.

 

Good idea. Thanks.

 

Out of curiosity, with something as simple as this, what's the value of creating a backup? The small chance that something would go wrong with the coding and you wouldn't be able to revert to original setting?

 

I put this over in Mercedes Tech Talk:
Using LAUNCH Creader Elite BENZ to calibrate radar sensors

I don't know if you can do the same with iCarsoft, but Creader seems more capable (and dangerous). Folks should understand that these changes are at their own risk and that our experiences are based on our cars.

 

That is correct. ANY time you write to a control module, not fully understanding what you are doing or an external event occurs, you should make a backup first. If you are writing and the voltage drops too low because your battery is weak and you have not attached a charger, or you bump the cable swatting at a bee that flew in the window, the writing could be interrupted with unknown consequences. It takes seconds to create the backup, so be safe. Hope for the best, plan for the worst.

 

I would add the "battery tender" while playing with the scanner. Once coding is started, as @JettaRed mentioned, you do not know how long it would take and if the battery dies -> Surpirse

Also, we may start thinking is going to be 5 min in the car, and suddenly we become playful and stay 20+min, with the door open, radio ON, and so on.

 

It's likely that the memory that stores these parameters are written in blocks of data, not individual bytes. Changing a single parameter requires reading a block of data (let's say 1024 bytes), changing 1 or 2 bytes, and re- writing the entire 1024 byte block. While unlikely, if an error occurred during the re-writing, some unknown byte could be changed and hose things up. Creating a backup of what was read prior to the change provides a means of restoring the original block of data if something goes wrong. Backups are a good practice.

 

Want to make sure I understand this. So let's say I'm looking at a particular parameter under variant coding in a particular module. When I click backup, it says operation successful....it doesn't give me any opportunity to name the backup. What exactly have I backed up? Just that particular parameter? Then if I click recover, it asks if I really want to that since I'm going back to a previous state. But it doesn't specify what I'm going back TO. It sounds like recover goes back to the most recent previous state, is that correct? i.e. that there's only one backup at a time.

 

I don't have the scanner in front of me, but the backup file should be the entire block of memory in which the changed parameter resides. The device probably assigns a file name like cameras do. Recover should restore the block of data as it existed before the change. There is usually some form of error checking embedded in the data, so if the coding is reported as successful, all is OK.

 

There are two opportunities to back up a module. The first is at the bottom of the list of items when you select a particular module, such as the Front SAM. You do need to provide a file name AND be connected to the internet. The other is to back up a particular variant, such the Turn Signal. As you can see in the pics above, there is a Backup and Recover button right next to the Write Coding. What you are backing up is the current values BEFORE you write to the code. What you recover is the latest backup.

If I get a chance, I'll take some screenshots.

 

Am I the only one who runs diagnostics with the engine running? Never had an issue doing so.
That said, backups are never a bad idea.

 

Personally I do both engine running or tender according to expected length. Single scan or searching around.
I am not going to idle for 2 hours knowing the cylinders walls are not lubricated.

For those coding modules... our CAN-bus are loaded with goofy disrupted modules (ESP, SAM, CGW, ISM, EZS, ...).

Don't pin everything on marginal voltage, expect more it's a Mercedes.

 

Not sure running the engine accomplishes anything unless you're collecting real-time data. Error codes are stored when anomalies occur under prerequisite driving conditions. Some scanners require ignition on so that all electrical circuits and ECUs are active and the stored codes can be retrieved. But unless the scanner says specifically not to start the engine, it probably has no effect.

Backups are a good idea, especially if you do extensive customization. It's nice to return the car's configuration to OE before selling it so the new owner isn't freaked out.

 

A couple of things to keep in mind.

1. Some scanners do require the ignition to be ON to scan properly. XENTRY, the standard, is one such tool.
2. Some scanners require the battery voltage to be at a certain level, such as 12.3V (again, XENTRY).
3. Scanning with the engine running will ensure good voltage. However, you should never write to the engine ECU with the engine running. When I flash my ECU, the ignition must be ON, but the engine OFF.

 

Good advice -- especially #3.

 

Good comments. So, when I encounter this screen trying to write (for the ECO Start/Stop) what specifically does this boxed comment mean? Please clarify...

1)That the ignition should be in Pos. one only (engine not running), or
2)That the ignition is On and Engine Running only (pos.2)?

 

I mean I understand you are not asking me but I believe it means Position 2 but do not step on the brake when you put it there, you should see all the lights turn on and engine stayed off.

 

Correct. Usually, if the engine needs to be running, the instructions will state so. Otherwise, ignition ON means position 2 without starting the engine.

 

Thanks for confirming, I wasn't super sure with my response hence "I believe" so I was waiting for your response too.

 

I am thinking of ordering the Launch Creader Elite 2.0 Benz and had a couple of questions.

I want to Clear the Service Nag on my GLC300 (doesn't seem to work from my Mbux screens)
I would like to set the Eco Start/Stop to Last - Could someone explain which section and menu's to find?
Lastly, I would love to activate my SuperSport Screen that my car's have imbeded, but not turned on due to not being AMG. If someone know's how to do that with this scanner, I would appreciate even a basic explination.

Thanks.

 

1. What model year is the GLC 300? Is it a X253 or X254? If X253 or in your case (C253) use this tutorial: youtube.com/watch?v=rUbUQHOo2W0
2. Here you go: https://mbworld.org/forums/e-class-w...ii-reader.html
3. I am not sure the scanner will be able to do that.

 

Thank you for the link. My GLC is the X253, last year for Coupe in the old body style 2023. I have a 23 C300 Cabrio as well, last model year C205

 

I see, ya that youtube video should help out but it is correct the LAUNCH V2 is able to reset the service reminder/interval (ASSYST PLUS)

 

Does anyone know if these parameters are available on a W221 2009 S550? And if so, are they accessible with a Foxwell scanner?