Hi all, Im seeking some help here.
I have a 2017 mercedes e220d amg premium plus and I have had some terrible time with a recurring blind spot radar issue.

I got the following 3 warnings in the dashboard: 1. Active brake assist function limited. 2. Active blind spot assist inoperative & 3. Active lane keeping assist inoperative.

I took the car to a local garage and the mechanic put the car on the diagnostic tool and found C110178 error on the rear blind spot radar which he said the blind spot radar is faulty and needs replaced, also the traffic signs assist stopped working a week after which he said just needs reprogramming.

We ordered the SRR radar and replaced it, and error and warnings cleared but then after driving the car for a couple of weeks I noticed the driver side blind spot started flase alerting before I get the exact same 3 warnings again and same C110178 error showed up again on the new radar in the diagnostic tool.

Now I'm suspecting its definitely something else that causing this issue.

Has anyone faced a similar issue?? Does anyone know how to fix this?

Thanks in advance.

 

That is not unusual. The rear radar and harness extension are exposed to wheel projections.
They can be partially repaired and/or go bad as soon as renewed. Harness may still be bad...

Unless you can fix things well by yourself, you have no other choice. You simply need to have a Mercedes specialist repair or keep repairing your vehicle.

These modules are famous for taking on water. Making them water tight is not part of the Xentry repair procedure...
Repairs do carry a warranty "parts & service" - Good luck getting your free repairs.

If you had a cheap Launch scanner you could see for yourself what is going on with your car. Without any tool your trust can only be with the specialist serving your needs.

 

The new radar needs proper software coding with a Mercedes-specific diagnostic system. An independent shop likely can't do it. You need a dealer or a specialist with the right tools to configure it correctly.

 

Hi, thanks for taking the time and replying to my post. I'm no mechanic or near that. I have taken the car again to a specialist yesterday who ran a full diagnostic scan and the fault on radar was "c1108 - radar sensor 8: malfunction. C110178 The radar sensor 1 has malfunction. The adaptation or adjustment is incorrect." The mechanic did a full calibration on the radar and drove it for around 30km and warnings didn't go away. He asked me to come back again next week to remove the rear bumper and check for the alignment or dirt and then recalibrate again.
I have noticed that there were a bunch of other faults like Anti-collision ABA/DTR, cruise control ABA/DTR and powersteering - undervoltage circuit 30.
I'm not sure if there is any coloration between these faults, but I'm suspecting that mechanics are not lookin for the underlying issue and just trying to resolve the symptoms.

 

Yes, I went to a specialist who coded them and calibrated but warnings wouldn't go away. He suspected it could be a misalign issue so asked me to come back next week to remove the bumper and check for alignment or dirt issue and recalibrate again.
I'm suspecting these mechanics are not looking for the underlying issue and just trying to clear the codes rather finding the root cause.

 

You are begining to understand why fixing issues by the book can yield limited results...

The rear and front Radar modules running off of extra-long undersized harnesses do not fare well with unstable voltages.
You really want to use a good automated float charger to top off your on-board batteries to begin with.
Feel free to assess the alternator and batteries as root cause of poor chassis voltage...
This will help tame the voltage chaos to get radars on their best behaviors for calibration.

Again connections on bumper harness may have been soaked and require inspection/replacement, not only module itself if issues remain persistent.

"Radar calibration" are like "tranny adaptations" they can only accomplish so much - First step is to troubleshoot underlaying issue.

Hopefully this gets resolved soon else ask technician for a whole chassis scan to understand what's happening chassis wide.
🤞

 

Hi, thanks for the information. I was able to inspect the radar myself by simply getting under the car and look at where its located. I couldn't spot anything obvious with the radar location, it looked okay to me and no dirt, corrode or water observed.
One thing that I observed is the connector that is plugged to the radar has 6 wires and 2 of these 6 wires were cut off (yellow and green wires). See the photo I took.
Now I don't know if this is normal as xentry can communicate to the radar and no wiring fault is present on the radar. But it looks off to me.

 

Bingo: you found your issue.


You can use any cheapo wire to replace the missings to where they go : use a schemetic diagram.
The shop where this car has been is not where it should go again!

 

Do you know if all 6 wires supposed to be connected? I tried to use schematic diagram but the problem the cable they are connected to have only 4 wires, not sure if its a problem with that cable or something is missing. Could it be a 6 pins connector wired into a 4 wires cable?

 

You're right, 4 wires is good enough for CAN Modules.
Does the connector look good without water oxidation?
Switch left/right modules around.

 

yes, all looked okay to me. No sign of water or corrode. The only thing I can say is the radar wasn't sitting very tight in the bracket, I was able to move it slightly quite easily. It was secured in the bracket and not coming out, but you can easily move it slightly within the bracket as if the clip wasn't tight enough. Do you know if it has to be immovable? Like you can't move it at all?

 

good point! It us not suppose to be loosely held.
Glue it with silicone RTV and coat junction between wire harness to connector so water does not enter through connector wires: this is how these modules get direct water intrusion.

 

Thanks mate. I'm gonna try this.
Do you know if I need to reprogram or recalibrate the sensor? Or could be a full system reset?
I have read some posts mentioned that they had to do a full system reset or reflash the full system again to clear the faults.

 

no need to reflash firmware
clear active faults.

TEMPORARY....
If you are not ready to glue Module fixed yet during testing....
simply insert some kind of cardboard or plastic as spacer to help module not move.

 

You are a star. Unfortunately i don't have any diagnostic scan tools so i will have to go to local garage to clear the fault. Any recommendations or buying a scanning tool?
Also very good point about sticking a cardboard or plastic temporarily and see if the warnings will be gone.

 

A $125 handheld scanner by LAUNCH Co. such as "cReader MB Elite" will expose every module for individual fault clearing.

By now there may be cheaper plug-ins with free updates when you pay the annual fees to enable the phone Application...

 

Thanks again. I have put a cardboard and the radar is immovable now. Drove the car for about 15km but warnings are still there. Probably as you said I need to clear the fault using a scanner.
I couldnt find the cReader MB Elite, I'm based in Europe btw. Any other good recommendations? I'm willing to pay a bit more of a good scanner that scan and update every module. Also, do I need to have a license or account to be able to connect online to download official updates and coding for all modules?

 

The advanced pro scanners for live firmware updates are 2000 €, not 125€.

Look at LAUNCH Company product line (absolutely no affiliation!).

Arguably they have the best module coverage for Mercedes.

Most handheld brands are over promising marketing with very poor actual coverage.

They maybe other good scanners out there....

 

Thanks a lot. I will look at their LUANCH products and get one of them. All I need is a scanner which can tell me the faults, clear them, update and program all modules in the car.
Thank you again for all the support.

 

The "update" function is not included on cheap units and frankly unlikely necessary.
"New software... new problems"

 

Thanks. I'm gonna go with the cReader Elite, the one you have recommended already.
Also, would you have the exact location of the rear sensors? I'm planning to remove the bumper today and remove the sensors, clean them and relocate them correctly then clear the faults in the scanner tool.

 

rear radar modules are located on the bumper side corners. You may not need to remove the bumper "skin" cover for module access.

 

Thanks. I tried to access the modules without removing the bumper but couldn't.
Would you please have the exact location in the rear bumper? Like is there any specific distance between modules or for example specific measures from the corners or from the top of the bumper, etc? I'm suspecting the module was located incorrectly when replaced.

 

Removing the whole bumper for that maybe more work than necessary.... grab a good LED flashlight and look up from under trunk area in the rear side corners at 45° angle... that's your blind spot modules.

 

thank you, I could locate them but I'm suspecting they are incorrectly fitted in. I was looking for their exact location in the rear bumper so I can remove them and their brackets and refit them