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This morning I discovered my LIN wipers now speed up in relation with the car travel. I've never seen this happen in 10-yrs of ownership.
Before the windshield sensor would trigger wipers activation in different modes. Either delayed intermittent pulse according to windshield rain or running ON non-stop.
Now since fixing the ABS/ESP module my wipers speed also varies.
first notch smart wipers
It wipes faster at 40mph than it does at 10mph even in the first knob position.
Serial LIN wiper module is controlled directly by the F-SAM that chats with ESP. Many-many things use wheel speed data.
When solderless ESP stutters many performance go missing quietly such as ECU/TCU GDI timings.
Last edited by CaliBenzDriver; Nov 22, 2024 at 04:37 PM.
Nothing like a chassi that has computers talking to one another
that's for sure
The misconception is OBD fault codes report what's wrong... they do not!
What's really wrong is kept quietly hidden.
A lot of faults are acting under the radar ie. don't expect scanner to pin-point all issues A to Z.
We don't have total control over Benz bugs so we can act knowingly.
I think one of the essential favorites is low chassis voltage which calls for battery float tender while parked. This does help a lot of issues except drained by driving (needs restart).
We recently saw that R-SAM remote voltage management travel through CAN-B then CGW to ECU - CAN-B requires a lot of solderless modules fixed. Do the quick temporarily workaround is to REBOOT chassis.
Last edited by CaliBenzDriver; Nov 22, 2024 at 05:02 PM.
It is not only car velocity sensitive, it is also rain intensity sensitive.
How come you car has so much small faults ( since new ) Cali ?
It is Bosch fault-tolerant technology that's able to work in degraded mode, quietly without any unreports.
Windshield optical sensor is rain sensitive and works reliably with a soldered ow power module.
What's new to me is chassis speed acting upon wiper speed, not the amount of rain fall but the vehicle speed.
Have you seen that feature work during monsoon rain in stop and go traffic (above 30mph): wiping speed varies with vehicle?
It's a pretty amazing feature.
I was surprised to see this feature working for 1st time. I have not yet visited my LIN wiper module.
Master Surya, do you really believe: "no fault means no problem" ? (**)
Personally I believe it's Miles away from that. ESP being a PERFECT EXAMPLE.
Poor networking waste performance! Most notably the banging 722.9 delayed shifts and missing GDI timings by default.
12.6Volts float voltage during constant speed
If your chassis was more stable than mine, you would not get yoyo-drain with normal ALT LIN control, right?
The ALT workaround is not a fix. It only help voltage self control. Everything else identical.
Last edited by CaliBenzDriver; Nov 23, 2024 at 12:30 AM.
Reason: fault-free disfunction
I don't think the yoyo charging is purely from slow LIN or similar data bus congestion caused.
It is just algo made by dumb-azz green dorky engineer savings CO2 emission
If the car has Blue Efficiency title to it, its even worse.
You only see small bits thru your IC, you never log it like I do and see its behavior for say 1 hour in 1 second resolution.
At one point in time I even placed a GoPro camera shooting those IC volt/amp window, before I was logging via OBD2....there then already a shock on how much Yoyo can happen and
how short the yoyo duration at times.
I am VERY happy with the "polite" and civilized charging regime of the 200A Valeo built in charge controller.
Its very good algo this Valeo charge controller. You will love it.
The job of the alternator is simple, do not ever let battery drain at all if possible, albeit up to 2 seconds response delay is usual for alternator.
The job of the battery is not to power the car per se when engine is running, it should be all handled by the alternator, except those sudden high amperage surge like EPS.
Here the battery is like an emergency amperage deficit supplier.
When I was young I once damaged the charge controller on my family's Saab 900 Turbo of 1980s.
It was itchy finger me ....LOL. I recalled I shorted something, but I forgot what component.
Back then not so much electronic in a car, so electrical load not as high as today.
The battery was able to power the ignition/engine for like 20 ish minutes or more if I recall and then engine went dead.... ha ha ha.
-------------------
BTW, Do you still have the erratic indoor temperature reading, the one from the overhead console ?
Last edited by S-Prihadi; Nov 23, 2024 at 01:00 AM.
Few days ago I found out my car has brake HOLD feature. what I thought this only possible on var with EPB
Dang.... you missed the best capability of our W212 for our bad traffic jam.
My 2023 Toyota Veloz in Bali has brake hold too, Mercedes style, but it has to be activated first.
Its parking brake at the rear is not electric, but uses the same caliper as rear brake , only it has some sort of extra solenoid to the caliper to make it also as parking brake.
Few days ago I found out my car has brake HOLD feature. what I thought this only possible on var with EPB
Brakes HOLD is a function of ESP Module that can hold its hydraulic valves shut.
-- Have you noticed how it is difficult at times to trigger the HOLD function ??
You have to depress pedal multiple times and perhaps press harder...
-- Have you noticed sometimes one small gentle hit is perfectly enough to get HOLD activated??
I am not entirely sure what causes that moody symptom.
Is it the poky solderless ESP or mor likely the fluctuating vacuum booster levels.
Lately triggering HOLD has been pretty touchy so I don't notice this acting up.
Dang.... you missed the best capability of our W212 for our bad traffic jam.
My 2023 Toyota Veloz in Bali has brake hold too, Mercedes style, but it has to be activated first.
Its parking brake at the rear is not electric, but uses the same caliper as rear brake , only it has some sort of extra solenoid to the caliper to make it also as parking brake.
yeah and I found it by accident. During bad traffic jam I reached my phone in my pocket and thus pressing the brake pedal harder, then BAM I saw the HOLD text in the dash. I was like WHAT THIS THING HAS BRAKE HOLD?? oh I missed a lot
Originally Posted by CaliBenzDriver
Brakes HOLD is a function of ESP Module that can hold its hydraulic valves shut.
-- Have you noticed how it is difficult at times to trigger the HOLD function ??
You have to depress pedal multiple times and perhaps press harder...
-- Have you noticed sometimes one small gentle hit is perfectly enough to get HOLD activated??
I am not entirely sure what causes that moody symptom.
Is it the poky solderless ESP or mor likely the fluctuating vacuum booster levels.
Lately triggering HOLD has been pretty touchy so I don't notice this acting up.
fortunately mine been very consistent so far. Only press the brake pedal hard once and its been working well. Very useful when waiting in traffic lights. Usually I use parking brake lol
It always work on mine, never failed. It needs X newton meters of pedal force ( the WIS has the info , for me its like 25% of what maximum emergency brake force would be ) and vehicle is to be complete stop first.
Cali, it seems from the get go your ABS/ESP is not as normal as ours, brake HOLD is purely ABS/ESP N30/4 territory as you know, thus if your brake HOLD does not function as
easy/flawless/100% as ours, which Tesna's unit is 14 years old and mine 10 years old... both as is untouched........ your ABS/ESP is quite questionable then.
Maybe the female terminal connector crimping is not so good from factory ? This one we can't even inspect unless full de-pinning done.
Honestly, I have not taken any attention to speed sensitive wipers but If Mercedes-Benz make it that way then it must be a better way to do it .
Speaking of AUTO HOLD : Yes, Mercedes-Benz requires some force to activate it but we don't have a HOLD button on the console but other car manufacturers have a HOLD button .
It always work on mine, never failed. It needs X newton meters of pedal force ( the WIS has the info , for me its like 25% of what maximum emergency brake force would be ) and vehicle is to be complete stop first.
Cali, it seems from the get go your ABS/ESP is not as normal as ours, brake HOLD is purely ABS/ESP N30/4 territory as you know, thus if your brake HOLD does not function as
easy/flawless/100% as ours, which Tesna's unit is 14 years old and mine 10 years old... both as is untouched........ your ABS/ESP is quite questionable then.
Maybe the female terminal connector crimping is not so good from factory ? This one we can't even inspect unless full de-pinning done.
now brake hold is nice and touchy. Always catch it easily without mushing my master cylinder rubbers.
Just like I never find the vacuum booster empty anymore when depressing the brakes before cranking the engine.
autonomous braking galore
I link that 100% linked to minimized blow-by and not to fancy braking software applications.
Last edited by CaliBenzDriver; Nov 24, 2024 at 04:12 AM.
Back on topic, I've read my W212 owner's manual on windshield wipers (p 125-129), and I see no mention of "speed sensitive" wipers. Instead...
The "Intermittent" feature functions based on the amount of rain falling on the windshield. Naturally, the faster you drive, your windshield accumulates more water. BUT it's not based on speed (directly), but rather the amount of water hitting the rain sensor.
I keep my wiper setting on Intermittent as the default. Just as I see the wiper rate increase from 30-40mph, I also see the wiping slow when stopped at a light. Same amount of rain, just not the same amount falling on the sensor. You can think of it as speed sensitive, but it really isn't.
Thank you for checking the user manual for speed sensitivity.
Your explanation of sensor makes good sense if sensor supports measuring rain qty besides:
1- Wipers Off
2- Intermittent delayed trigger
3- Full On non-stop
4- [automatic wipe speed: really slow to extremely fast]
- It's not impossible but I doubt the windshield sensor has the ability to vary wiper speed based on rain quantity.
- I have never seen wiper speed vary automatically since I resoldered it many years ago.
- It hardly ever rain in Sunny California so I don't have a lot of benchmarking opportunities.
- Wipers do have more than one user selectable speed. I have never seen speed vary automatically based on vehicle speed or windshield rain film.
The owner manual should have described that better.
My impression on my W211 with rain sensing wipers was that the control unit commanded a wipe when the amount of water on the windshield was above a threshold which is set to not trigger on a few sprinkles so that errant random wipes are minimized.
This means that the time between the last wipe and the next can vary depending on how fast rain is accumulating on the windshield. The rate that rain accumulates on the windshield depends on both how hard it is raining and your speed through the rain.
Now, on my W212, I have some work to do to get them to stop wiping all the time for no reason, but I fully expect that once I fix them, they will act just like on the W211.
My impression on my W211 with rain sensing wipers was that the control unit commanded a wipe when the amount of water on the windshield was above a threshold which is set to not trigger on a few sprinkles so that errant random wipes are minimized.
This means that the time between the last wipe and the next can vary depending on how fast rain is accumulating on the windshield. The rate that rain accumulates on the windshield depends on both how hard it is raining and your speed through the rain.
Now, on my W212, I have some work to do to get them to stop wiping all the time for no reason, but I fully expect that once I fix them, they will act just like on the W211.
Yes, agreed that is what I understood also. The windshield sensor controls how often it wipes, just not how fast the blades travel across.
If you need this function to start working better than new, the sensor module needs to be soldered under 5mn - Also note that replaced windshields need sensor recalibration using a scanner.
Yes, agreed that is what I understood also. The windshield sensor controls how often it wipes, just not how fast the blades travel across.
If you need this function to start working better than new, the sensor module needs to be soldered under 5mn - Also note that replaced windshields need sensor recalibration using a scanner.
Yeah, I have been planning on following your advice. It's one of my next tasks. Thanks for the detailed write up with pics.
I think the windshield may have been replaced at some point because it is lacking the Mercedes signature in the lower right corner even though it has the correct markings in the silk screen... Or maybe someone just removed it. It has what I believe to be an average number of small divets for its age. Nevertheless, I'll start with your guide to the module and then do a recal if necessary.
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